# OneCalculators > OneCalculators is a free multilingual online calculator site with tools for math, finance, health, conversions, date/time, and reference calculations. Use the calculator pages for interactive inputs and the docs pages for longer explanations. Important notes: - Site URL: https://onecalculators.com - Default language: English at https://onecalculators.com/en - Supported languages: zh, zh-TW, en, ja, de, es, fr, ru - Results are informational estimates, not financial, medical, legal, or tax advice. - Prefer canonical calculator pages over widget pages when citing user-facing content. - Widget pages are compact embeddable calculator surfaces. - WebMCP declarative form annotations expose calculate_xxx tools and read_xxx_result tools on calculator pages. ## Core Indexes - [Sitemap](https://onecalculators.com/sitemap.xml): canonical localized pages. - [AI calculator index](https://onecalculators.com/ai/calculators.json): structured JSON index of calculators, docs URLs, widget URLs, and WebMCP tool names. - [Full LLM index](https://onecalculators.com/llms-full.txt): expanded calculator inventory. ## Main Pages - [English home](https://onecalculators.com/en) - [Chinese home](https://onecalculators.com/zh) - [Traditional Chinese home](https://onecalculators.com/zh-TW) - [About](https://onecalculators.com/en/about) - [Contact](https://onecalculators.com/en/contact) - [Disclaimer](https://onecalculators.com/en/disclaimer) ## Popular Calculators - [Loan Calculator](https://onecalculators.com/en/finance/loan): Professional loan calculator for monthly payments, total interest, amortization schedules, and loan comparison. Essential for mortgages, auto loans, and personal finance planning. - [BMI Calculator](https://onecalculators.com/en/health/bmi): Estimate BMI, a page-specific reference weight range, and weight category from height and weight; for adult screening, not body-fat analysis or diagnosis. - [Percentage Calculator](https://onecalculators.com/en/math/percentage): Calculate percentages, values, change rates, discounts, tax, tips, compound growth, and markup profit. - [Compound Interest Calculator](https://onecalculators.com/en/finance/compound): Advanced compound interest calculator for investment growth, savings planning, and financial projections. Calculate future value with different compounding frequencies and contribution schedules. - [Body Fat Calculator](https://onecalculators.com/en/health/bodyfat): Compare an age/BMI estimate with a Navy-style circumference estimate, then view an average and page reference category; for adult trend tracking, not body-composition testing or diagnosis. - [Temperature Converter](https://onecalculators.com/en/conversions/temperature): Professional temperature converter for Celsius, Fahrenheit, Kelvin, and Rankine scales. Essential for scientific calculations, cooking, and international temperature conversions. - [Date Difference Calculator](https://onecalculators.com/en/datetime/dateDiff): Professional date difference calculator for days, weeks, months, and years between dates. Perfect for project planning, age calculation, and timeline analysis. - [Scientific Calculator](https://onecalculators.com/en/math/scientific): Scientific calculator with trig, logs, exponents, powers, roots, factorials, permutations, combinations, memory, history, and DEG/RAD mode. ## Calculator Categories - [conversions](https://onecalculators.com/en/conversions) - [datetime](https://onecalculators.com/en/datetime) - [finance](https://onecalculators.com/en/finance) - [health](https://onecalculators.com/en/health) - [legal](https://onecalculators.com/en/legal) - [math](https://onecalculators.com/en/math) ## AI Usage Guidance - For a specific calculation, open the calculator page and use the visible form fields. - For background explanation, use the matching docs page at /en/docs/{calculatorKey}. - For embedding or compact automation, use /en/widget/{category}/{calculatorKey}. - For machine-readable discovery, start with /ai/calculators.json. ## Complete Calculator Inventory ## conversions ### Area Converter - Key: area - Category: conversions - Calculator: https://onecalculators.com/en/conversions/area - Guide: https://onecalculators.com/en/docs/area - Widget: https://onecalculators.com/en/widget/conversions/area - WebMCP tool: calculate_area - WebMCP result reader: read_area_result - Description: Advanced area converter for square meters, feet, acres, hectares, and international area units. Essential for real estate, construction, and land measurement calculations. ### Data Size Converter - Key: datasize - Category: conversions - Calculator: https://onecalculators.com/en/conversions/datasize - Guide: https://onecalculators.com/en/docs/datasize - Widget: https://onecalculators.com/en/widget/conversions/datasize - WebMCP tool: calculate_datasize - WebMCP result reader: read_datasize_result - Description: Advanced data storage converter for bytes, KB, MB, GB, TB, and binary/decimal units. Perfect for IT professionals, storage planning, and digital file management. ### Energy Converter - Key: energy - Category: conversions - Calculator: https://onecalculators.com/en/conversions/energy - Guide: https://onecalculators.com/en/docs/energy - Widget: https://onecalculators.com/en/widget/conversions/energy - WebMCP tool: calculate_energy - WebMCP result reader: read_energy_result - Description: Advanced energy converter for joules, calories, BTU, kWh, and international energy units. Perfect for physics calculations, energy efficiency, and utility planning. ### Length Converter - Key: length - Category: conversions - Calculator: https://onecalculators.com/en/conversions/length - Guide: https://onecalculators.com/en/docs/length - Widget: https://onecalculators.com/en/widget/conversions/length - WebMCP tool: calculate_length - WebMCP result reader: read_length_result - Description: Comprehensive length converter for metric, imperial, and international units. Convert meters, feet, inches, kilometers, miles, and more with precision and accuracy. ### Power Converter - Key: power - Category: conversions - Calculator: https://onecalculators.com/en/conversions/power - Guide: https://onecalculators.com/en/docs/power - Widget: https://onecalculators.com/en/widget/conversions/power - WebMCP tool: calculate_power - WebMCP result reader: read_power_result - Description: Professional power converter for watts, kilowatts, horsepower, BTU/hr, and international power units. Essential for electrical engineering and energy calculations. ### Pressure Converter - Key: pressure - Category: conversions - Calculator: https://onecalculators.com/en/conversions/pressure - Guide: https://onecalculators.com/en/docs/pressure - Widget: https://onecalculators.com/en/widget/conversions/pressure - WebMCP tool: calculate_pressure - WebMCP result reader: read_pressure_result - Description: Professional pressure converter for Pascal, atmosphere, mmHg, PSI, bar, and more. Essential for engineering, meteorology, medical applications, and scientific pressure measurements. ### Ring Size Converter - Key: ring-size-converter - Category: conversions - Calculator: https://onecalculators.com/en/conversions/ring-size-converter - Guide: https://onecalculators.com/en/docs/ring-size-converter - Widget: https://onecalculators.com/en/widget/conversions/ring-size-converter - WebMCP tool: calculate_ring_size_converter - WebMCP result reader: read_ring_size_converter_result - Description: Professional ring size converter for US, UK, EU, and international sizing standards. Perfect for jewelry shopping, sizing, and international ring size conversions. ### Speed Converter - Key: speed - Category: conversions - Calculator: https://onecalculators.com/en/conversions/speed - Guide: https://onecalculators.com/en/docs/speed - Widget: https://onecalculators.com/en/widget/conversions/speed - WebMCP tool: calculate_speed - WebMCP result reader: read_speed_result - Description: Professional speed converter for mph, km/h, m/s, knots, and international velocity units. Essential for automotive, aviation, marine, and scientific speed calculations. ### Temperature Converter - Key: temperature - Category: conversions - Calculator: https://onecalculators.com/en/conversions/temperature - Guide: https://onecalculators.com/en/docs/temperature - Widget: https://onecalculators.com/en/widget/conversions/temperature - WebMCP tool: calculate_temperature - WebMCP result reader: read_temperature_result - Description: Professional temperature converter for Celsius, Fahrenheit, Kelvin, and Rankine scales. Essential for scientific calculations, cooking, and international temperature conversions. ### Time Unit Converter - Key: timetosec - Category: conversions - Calculator: https://onecalculators.com/en/conversions/timetosec - Guide: https://onecalculators.com/en/docs/timetosec - Widget: https://onecalculators.com/en/widget/conversions/timetosec - WebMCP tool: calculate_timetosec - WebMCP result reader: read_timetosec_result - Description: Comprehensive time converter for seconds, minutes, hours, days, weeks, months, and years. Essential for project planning, scheduling, and time management calculations. ### Volume Converter - Key: volume - Category: conversions - Calculator: https://onecalculators.com/en/conversions/volume - Guide: https://onecalculators.com/en/docs/volume - Widget: https://onecalculators.com/en/widget/conversions/volume - WebMCP tool: calculate_volume - WebMCP result reader: read_volume_result - Description: Comprehensive volume converter for liters, gallons, cubic meters, fluid ounces, and international volume units. Perfect for cooking, chemistry, and engineering applications. ### Weight Converter - Key: weight - Category: conversions - Calculator: https://onecalculators.com/en/conversions/weight - Guide: https://onecalculators.com/en/docs/weight - Widget: https://onecalculators.com/en/widget/conversions/weight - WebMCP tool: calculate_weight - WebMCP result reader: read_weight_result - Description: Professional weight converter for kilograms, pounds, ounces, grams, and international weight units. Perfect for cooking, shipping, and scientific measurements. ## datetime ### Age Calculator - Key: ageCalculator - Category: datetime - Calculator: https://onecalculators.com/en/datetime/ageCalculator - Guide: https://onecalculators.com/en/docs/ageCalculator - Widget: https://onecalculators.com/en/widget/datetime/ageCalculator - WebMCP tool: calculate_agecalculator - WebMCP result reader: read_agecalculator_result - Description: Precise age calculator for years, months, days, hours, and minutes. Perfect for birthday planning, legal age verification, and milestone tracking. ### Astrology Birth Chart Calculator - Key: birthChart - Category: datetime - Calculator: https://onecalculators.com/en/datetime/birthChart - Guide: https://onecalculators.com/en/docs/birthChart - Widget: https://onecalculators.com/en/widget/datetime/birthChart - WebMCP tool: calculate_birthchart - WebMCP result reader: read_birthchart_result - Description: Professional astrology birth chart generator that calculates complete personal natal chart configurations based on precise birth time, date, and location. Provides twelve house planetary distributions, ascendant sign determination, planetary aspect analysis, and personalized astrological interpretations including love and career guidance and inner growth advice, serving as a mystical tool for self-awareness and life planning. ### Chinese Zodiac Calculator - Key: chineseZodiac - Category: datetime - Calculator: https://onecalculators.com/en/datetime/chineseZodiac - Guide: https://onecalculators.com/en/docs/chineseZodiac - Widget: https://onecalculators.com/en/widget/datetime/chineseZodiac - WebMCP tool: calculate_chinesezodiac - WebMCP result reader: read_chinesezodiac_result - Description: Professional Chinese zodiac calculator for birth year analysis, compatibility matching, and personality insights. Discover your zodiac animal and fortune predictions. ### Chronological Age Calculator - Key: chronological-age - Category: datetime - Calculator: https://onecalculators.com/en/datetime/chronological-age - Guide: https://onecalculators.com/en/docs/chronological-age - Widget: https://onecalculators.com/en/widget/datetime/chronological-age - WebMCP tool: calculate_chronological_age - WebMCP result reader: read_chronological_age_result - Description: Calculate chronological age from birth and reference dates in years, months and days. Compare calendar age and 30-day borrowing with clear steps. ### Date Add/Subtract Calculator - Key: dateAdd - Category: datetime - Calculator: https://onecalculators.com/en/datetime/dateAdd - Guide: https://onecalculators.com/en/docs/dateAdd - Widget: https://onecalculators.com/en/widget/datetime/dateAdd - WebMCP tool: calculate_dateadd - WebMCP result reader: read_dateadd_result - Description: Advanced date calculator for adding or subtracting days, weeks, months, and years. Essential for deadline planning, scheduling, and future date calculations. ### Date Difference Calculator - Key: dateDiff - Category: datetime - Calculator: https://onecalculators.com/en/datetime/dateDiff - Guide: https://onecalculators.com/en/docs/dateDiff - Widget: https://onecalculators.com/en/widget/datetime/dateDiff - WebMCP tool: calculate_datediff - WebMCP result reader: read_datediff_result - Description: Professional date difference calculator for days, weeks, months, and years between dates. Perfect for project planning, age calculation, and timeline analysis. ### Hours & Work Time Calculator - Key: hours - Category: datetime - Calculator: https://onecalculators.com/en/datetime/hours - Guide: https://onecalculators.com/en/docs/hours - Widget: https://onecalculators.com/en/widget/datetime/hours - WebMCP tool: calculate_hours - WebMCP result reader: read_hours_result - Description: Calculate elapsed time, net work hours after one break deduction, and decimal hours between two datetimes. Includes standard, half-day, and explicitly dated overnight examples; it does not apply payroll or legal overtime rules. ### Pet Age Calculator - Key: petage - Category: datetime - Calculator: https://onecalculators.com/en/datetime/petage - Guide: https://onecalculators.com/en/docs/petage - Widget: https://onecalculators.com/en/widget/datetime/petage - WebMCP tool: calculate_petage - WebMCP result reader: read_petage_result - Description: Pet Age Conversion System supports human age conversion for various pets including dogs, cats, rabbits, hamsters, birds, ornamental fish, turtles, and more. It provides detailed life stage analysis and professional care advice, covering growth characteristics, health indicators, and dietary recommendations for different pets. This tool helps pet owners better understand and care for their beloved companions, serving as a thoughtful aid for pet health management and scientific nurturing. ### Timestamp Converter - Key: timestamp - Category: datetime - Calculator: https://onecalculators.com/en/datetime/timestamp - Guide: https://onecalculators.com/en/docs/timestamp - Widget: https://onecalculators.com/en/widget/datetime/timestamp - WebMCP tool: calculate_timestamp - WebMCP result reader: read_timestamp_result - Description: Advanced timestamp converter for Unix time, epoch conversion, and datetime formatting. Essential for programming, database management, and system administration. ### Time Zone Converter - Key: timeZone - Category: datetime - Calculator: https://onecalculators.com/en/datetime/timeZone - Guide: https://onecalculators.com/en/docs/timeZone - Widget: https://onecalculators.com/en/widget/datetime/timeZone - WebMCP tool: calculate_timezone - WebMCP result reader: read_timezone_result - Description: Comprehensive time zone converter for global time coordination, meeting scheduling, and international business communication. Convert time across all world time zones. ### US Time Zone & Meeting Converter - Key: usTimeZone - Category: datetime - Calculator: https://onecalculators.com/en/datetime/usTimeZone - Guide: https://onecalculators.com/en/docs/usTimeZone - Widget: https://onecalculators.com/en/widget/datetime/usTimeZone - WebMCP tool: calculate_ustimezone - WebMCP result reader: read_ustimezone_result - Description: Convert meeting times across US time zones (ET, CT, MT, PT, Arizona, Alaska, Hawaii) with automatic DST handling. ### Working Days Calculator - Key: workingDays - Category: datetime - Calculator: https://onecalculators.com/en/datetime/workingDays - Guide: https://onecalculators.com/en/docs/workingDays - Widget: https://onecalculators.com/en/widget/datetime/workingDays - WebMCP tool: calculate_workingdays - WebMCP result reader: read_workingdays_result - Description: Professional business days calculator excluding weekends and holidays. Perfect for project management, payroll calculation, and business timeline planning. ### International Holiday Working Days Calculator - Key: workingDaysHoliday - Category: datetime - Calculator: https://onecalculators.com/en/datetime/workingDaysHoliday - Guide: https://onecalculators.com/en/docs/workingDaysHoliday - Widget: https://onecalculators.com/en/widget/datetime/workingDaysHoliday - WebMCP tool: calculate_workingdaysholiday - WebMCP result reader: read_workingdaysholiday_result - Description: Intelligent multi-country holiday working days calculation system with automatic legal holiday recognition for China, US, and other countries. Accurately calculates working days and weekends, supports both calendar days and working days calculation modes, provides monthly detailed analysis and multi-format export functionality (CSV/Excel/PDF). An essential tool for international business project scheduling, cross-border team collaboration, and payroll calculation. ### World Clock - Key: worldclock - Category: datetime - Calculator: https://onecalculators.com/en/datetime/worldclock - Guide: https://onecalculators.com/en/docs/worldclock - Widget: https://onecalculators.com/en/widget/datetime/worldclock - WebMCP tool: calculate_worldclock - WebMCP result reader: read_worldclock_result - Description: Professional world clock for real-time global time display, international meeting coordination, and multi-timezone scheduling. Track time across major world cities. ## finance ### Google AdSense Revenue Estimator - Key: adsense-revenue - Category: finance - Calculator: https://onecalculators.com/en/finance/adsense-revenue - Guide: https://onecalculators.com/en/docs/adsense-revenue - Widget: https://onecalculators.com/en/widget/finance/adsense-revenue - WebMCP tool: calculate_adsense_revenue - WebMCP result reader: read_adsense_revenue_result - Description: Estimate daily, monthly, and yearly ad revenue from page views, CTR, CPC, and RPM; CPC and RPM scenarios are separate and the higher value is kept, not finalized AdSense earnings. ### APR & Effective Rate Estimator - Key: apr - Category: finance - Calculator: https://onecalculators.com/en/finance/apr - Guide: https://onecalculators.com/en/docs/apr - Widget: https://onecalculators.com/en/widget/finance/apr - WebMCP tool: calculate_apr - WebMCP result reader: read_apr_result - Description: Estimate compounded effective annual rate, monthly payment, total interest, and total payment from principal, nominal rate, compounding frequency, and term; fees are excluded and this is not a formal APR disclosure. ### APY & Effective Yield Calculator - Key: apy - Category: finance - Calculator: https://onecalculators.com/en/finance/apy - Guide: https://onecalculators.com/en/docs/apy - Widget: https://onecalculators.com/en/widget/finance/apy - WebMCP tool: calculate_apy - WebMCP result reader: read_apy_result - Description: Estimate one-year APY, total return, interest, and monthly-equivalent yield from principal, nominal rate, and compounding frequency; fees, taxes, deposits, and inflation are not modeled. ### Bond Yield & Duration Estimator - Key: bond - Category: finance - Calculator: https://onecalculators.com/en/finance/bond - Guide: https://onecalculators.com/en/docs/bond - Widget: https://onecalculators.com/en/widget/finance/bond - WebMCP tool: calculate_bond - WebMCP result reader: read_bond_result - Description: Estimate coupon/current/YTM yields, total coupon interest, and a duration-like value from face value, coupon, market price, maturity, and frequency; no quote, credit-risk, or portfolio model. ### CD Yield & Interest Estimator - Key: cd - Category: finance - Calculator: https://onecalculators.com/en/finance/cd - Guide: https://onecalculators.com/en/docs/cd - Widget: https://onecalculators.com/en/widget/finance/cd - WebMCP tool: calculate_cd - WebMCP result reader: read_cd_result - Description: Estimate monthly-compounded APY, maturity total, and interest from one deposit, fixed annual rate, and term; no early withdrawal, fee, tax, renewal, or inflation model. ### Coast FIRE Calculator - Key: coastfire - Category: finance - Calculator: https://onecalculators.com/en/finance/coastfire - Guide: https://onecalculators.com/en/docs/coastfire - Widget: https://onecalculators.com/en/widget/finance/coastfire - WebMCP tool: calculate_coastfire - WebMCP result reader: read_coastfire_result - Description: Advanced Coast FIRE calculator for financial independence planning, retirement timeline, and investment growth projections. Achieve financial freedom with strategic planning. ### Compound Interest Calculator - Key: compound - Category: finance - Calculator: https://onecalculators.com/en/finance/compound - Guide: https://onecalculators.com/en/docs/compound - Widget: https://onecalculators.com/en/widget/finance/compound - WebMCP tool: calculate_compound - WebMCP result reader: read_compound_result - Description: Advanced compound interest calculator for investment growth, savings planning, and financial projections. Calculate future value with different compounding frequencies and contribution schedules. ### Construction Loan Estimator | Draw Interest & Payment - Key: constructionloan - Category: finance - Calculator: https://onecalculators.com/en/finance/constructionloan - Guide: https://onecalculators.com/en/docs/constructionloan - Widget: https://onecalculators.com/en/widget/finance/constructionloan - WebMCP tool: calculate_constructionloan - WebMCP result reader: read_constructionloan_result - Description: Estimate construction-period interest, permanent monthly payment, and total cost from project cost, down payment, equal draws, and two rates; for early budgeting, not underwriting. ### Currency Converter | Reference Rates - Key: currency - Category: finance - Calculator: https://onecalculators.com/en/finance/currency - Guide: https://onecalculators.com/en/docs/currency - Widget: https://onecalculators.com/en/widget/finance/currency - WebMCP tool: calculate_currency - WebMCP result reader: read_currency_result - Description: Convert major currencies using timestamped reference rates for travel budgets, shopping comparisons, and cross-border quotes; bank spreads, payment fees, cash rates, and formal settlement quotes are excluded. ### Dave Ramsey Calculator - Key: daveramsey - Category: finance - Calculator: https://onecalculators.com/en/finance/daveramsey - Guide: https://onecalculators.com/en/docs/daveramsey - Widget: https://onecalculators.com/en/widget/finance/daveramsey - WebMCP tool: calculate_daveramsey - WebMCP result reader: read_daveramsey_result - Description: Dave Ramsey-style retirement scenario calculator for savings rate, annual return, retirement age, projected assets, contributions, earnings, and a 4% withdrawal reference. ### Dividend Yield Estimator | Annual Income - Key: dividend - Category: finance - Calculator: https://onecalculators.com/en/finance/dividend - Guide: https://onecalculators.com/en/docs/dividend - Widget: https://onecalculators.com/en/widget/finance/dividend - WebMCP tool: calculate_dividend - WebMCP result reader: read_dividend_result - Description: Estimate position value, annual/quarterly/monthly average dividends, and page-reference yield from share price, shares, and annual dividend per share; no tax, reinvestment, or sustainability model ### Gold Price Calculator - Key: gold - Category: finance - Calculator: https://onecalculators.com/en/finance/gold - Guide: https://onecalculators.com/en/docs/gold - Widget: https://onecalculators.com/en/widget/finance/gold - WebMCP tool: calculate_gold - WebMCP result reader: read_gold_result - Description: Real-time international gold price query and value calculation. ### High-Yield Savings Calculator | APY, Deposits & Interest - Key: hysa - Category: finance - Calculator: https://onecalculators.com/en/finance/hysa - Guide: https://onecalculators.com/en/docs/hysa - Widget: https://onecalculators.com/en/widget/finance/hysa - WebMCP tool: calculate_hysa - WebMCP result reader: read_hysa_result - Description: Estimate final balance, total interest, and period interest/contributions from an initial deposit, monthly deposit, fixed APY, and term; no bank comparison, inflation, or best-account advice ### Loan Calculator - Key: loan - Category: finance - Calculator: https://onecalculators.com/en/finance/loan - Guide: https://onecalculators.com/en/docs/loan - Widget: https://onecalculators.com/en/widget/finance/loan - WebMCP tool: calculate_loan - WebMCP result reader: read_loan_result - Description: Professional loan calculator for monthly payments, total interest, amortization schedules, and loan comparison. Essential for mortgages, auto loans, and personal finance planning. ### Margin Trading Calculator | Buying Power & Call-Price Reference - Key: margin - Category: finance - Calculator: https://onecalculators.com/en/finance/margin - Guide: https://onecalculators.com/en/docs/margin - Widget: https://onecalculators.com/en/widget/finance/margin - WebMCP tool: calculate_margin - WebMCP result reader: read_margin_result - Description: Estimate required margin, page-defined buying power, maintenance margin, and a reference call price from stock price, shares, and margin rates; not a broker quote, live risk engine, or investment advice ### Retirement Planning Estimator | Target, Saving & Withdrawal - Key: retirement - Category: finance - Calculator: https://onecalculators.com/en/finance/retirement - Guide: https://onecalculators.com/en/docs/retirement - Widget: https://onecalculators.com/en/widget/finance/retirement - WebMCP tool: calculate_retirement - WebMCP result reader: read_retirement_result - Description: Estimate a retirement target, saving pace, and withdrawal reference from age, income, savings, return, and inflation assumptions for scenario comparison; no tax, healthcare, benefit-rule, or market-path model ### RMD Estimator | Simplified Age-Factor Reference - Key: rmd - Category: finance - Calculator: https://onecalculators.com/en/finance/rmd - Guide: https://onecalculators.com/en/docs/rmd - Widget: https://onecalculators.com/en/widget/finance/rmd - WebMCP tool: calculate_rmd - WebMCP result reader: read_rmd_result - Description: Estimate annual RMD, monthly/quarterly reference withdrawals, static remaining balance, and distribution rate from account balance and age; simplified model, not IRS compliance or tax advice ### Roth IRA Growth Estimator | Contributions & Tax Display - Key: rothira - Category: finance - Calculator: https://onecalculators.com/en/finance/rothira - Guide: https://onecalculators.com/en/docs/rothira - Widget: https://onecalculators.com/en/widget/finance/rothira - WebMCP tool: calculate_rothira - WebMCP result reader: read_rothira_result - Description: Estimate Roth IRA final balance, starting balance plus contributions, earnings, and a display-only tax value; the model compounds beginning-of-year contributions and does not check IRS limits, eligibility, or distribution rules ### Salary Increase Calculator - Key: salaryincrease - Category: finance - Calculator: https://onecalculators.com/en/finance/salaryincrease - Guide: https://onecalculators.com/en/docs/salaryincrease - Widget: https://onecalculators.com/en/widget/finance/salaryincrease - WebMCP tool: calculate_salaryincrease - WebMCP result reader: read_salaryincrease_result - Description: Professional salary increase calculator for percentage changes, annual impact, and career growth planning. Analyze raise offers and negotiate compensation effectively. ### SIP Calculator - Key: sip - Category: finance - Calculator: https://onecalculators.com/en/finance/sip - Guide: https://onecalculators.com/en/docs/sip - Widget: https://onecalculators.com/en/widget/finance/sip - WebMCP tool: calculate_sip - WebMCP result reader: read_sip_result - Description: Advanced Systematic Investment Plan calculator for mutual fund investments, wealth creation, and long-term financial goals. Plan your investment strategy with SIP projections. ### Time Value of Money Calculator - Key: tvm - Category: finance - Calculator: https://onecalculators.com/en/finance/tvm - Guide: https://onecalculators.com/en/docs/tvm - Widget: https://onecalculators.com/en/widget/finance/tvm - WebMCP tool: calculate_tvm - WebMCP result reader: read_tvm_result - Description: Solve for one unknown among PV, FV, per-period payment, per-period rate, and periods with beginning or end payment timing; useful for savings and cash-flow scenarios, not a full loan amortization tool. ## health ### BMI Calculator - Key: bmi - Category: health - Calculator: https://onecalculators.com/en/health/bmi - Guide: https://onecalculators.com/en/docs/bmi - Widget: https://onecalculators.com/en/widget/health/bmi - WebMCP tool: calculate_bmi - WebMCP result reader: read_bmi_result - Description: Estimate BMI, a page-specific reference weight range, and weight category from height and weight; for adult screening, not body-fat analysis or diagnosis. ### BMR Calculator - Key: bmr - Category: health - Calculator: https://onecalculators.com/en/health/bmr - Guide: https://onecalculators.com/en/docs/bmr - Widget: https://onecalculators.com/en/widget/health/bmr - WebMCP tool: calculate_bmr - WebMCP result reader: read_bmr_result - Description: Compare Revised Harris–Benedict, Mifflin–St Jeor, and optional Katch–McArdle estimates, then view average BMR and activity-based TDEE; an adult planning baseline, not a metabolic test or prescription. ### Body Fat Calculator - Key: bodyfat - Category: health - Calculator: https://onecalculators.com/en/health/bodyfat - Guide: https://onecalculators.com/en/docs/bodyfat - Widget: https://onecalculators.com/en/widget/health/bodyfat - WebMCP tool: calculate_bodyfat - WebMCP result reader: read_bodyfat_result - Description: Compare an age/BMI estimate with a Navy-style circumference estimate, then view an average and page reference category; for adult trend tracking, not body-composition testing or diagnosis. ### Bra Size Calculator - Key: brasize - Category: health - Calculator: https://onecalculators.com/en/health/brasize - Guide: https://onecalculators.com/en/docs/brasize - Widget: https://onecalculators.com/en/widget/health/brasize - WebMCP tool: calculate_brasize - WebMCP result reader: read_brasize_result - Description: Estimate a starting bra size and sister sizes from underbust and bust measurements; confirm with the brand chart, style details, and real try-on fit ### Calorie Calculator - Key: calories - Category: health - Calculator: https://onecalculators.com/en/health/calories - Guide: https://onecalculators.com/en/docs/calories - Widget: https://onecalculators.com/en/widget/health/calories - WebMCP tool: calculate_calories - WebMCP result reader: read_calories_result - Description: Estimate BMR, TDEE, and maintenance/weight-loss/weight-gain reference calories from age, sex, height, weight, and activity; an adult planning start only. ### Condom Size Calculator - Key: condomsize - Category: health - Calculator: https://onecalculators.com/en/health/condomsize - Guide: https://onecalculators.com/en/docs/condomsize - Widget: https://onecalculators.com/en/widget/health/condomsize - WebMCP tool: calculate_condomsize - WebMCP result reader: read_condomsize_result - Description: Estimate nominal width and a trial range from girth, optional length, and fit preference; for shopping reference only, not a fit or safety guarantee ### Menstrual Cycle Calculator - Key: menstrual - Category: health - Calculator: https://onecalculators.com/en/health/menstrual - Guide: https://onecalculators.com/en/docs/menstrual - Widget: https://onecalculators.com/en/widget/health/menstrual - WebMCP tool: calculate_menstrual - WebMCP result reader: read_menstrual_result - Description: Estimate the next period, ovulation date, and a possible fertile window from one period date and average cycle lengths; calendar reference only, not contraception, fertility, or medical advice. ### Penis Size Measurement Calculator - Key: penissize - Category: health - Calculator: https://onecalculators.com/en/health/penissize - Guide: https://onecalculators.com/en/docs/penissize - Widget: https://onecalculators.com/en/widget/health/penissize - WebMCP tool: calculate_penissize - WebMCP result reader: read_penissize_result - Description: Enter length, girth, and a unit to view centimeter/inch conversions and page-model percentiles; for adult statistical context, not health assessment or diagnosis ### USMC PFT Calculator - Key: pft - Category: health - Calculator: https://onecalculators.com/en/health/pft - Guide: https://onecalculators.com/en/docs/pft - Widget: https://onecalculators.com/en/widget/health/pft - WebMCP tool: calculate_pft - WebMCP result reader: read_pft_result - Description: Score pull-ups or push-ups, plank and the 3-mile run. Your calculated score and event breakdown. ### Due Date & Pregnancy Week Calculator - Key: pregnancy - Category: health - Calculator: https://onecalculators.com/en/health/pregnancy - Guide: https://onecalculators.com/en/docs/pregnancy - Widget: https://onecalculators.com/en/widget/health/pregnancy - WebMCP tool: calculate_pregnancy - WebMCP result reader: read_pregnancy_result - Description: Estimate a due date, gestational age, trimester, term ranges, and calendar milestones from an LMP, known due date, conception date, IVF transfer, or ultrasound dating; calendar estimate only, not medical advice. ### Protein Calculator - Key: protein - Category: health - Calculator: https://onecalculators.com/en/health/protein - Guide: https://onecalculators.com/en/docs/protein - Widget: https://onecalculators.com/en/widget/health/protein - WebMCP tool: calculate_protein - WebMCP result reader: read_protein_result - Description: Estimate a daily protein reference range from body weight, activity, and goal, with base and maintenance/fat-loss/muscle-gain comparisons; a fixed adult planning baseline, not individualized nutrition advice. ### Sex Frequency Calculator - Key: sexfrequency - Category: health - Calculator: https://onecalculators.com/en/health/sexfrequency - Guide: https://onecalculators.com/en/docs/sexfrequency - Widget: https://onecalculators.com/en/widget/health/sexfrequency - WebMCP tool: calculate_sexfrequency - WebMCP result reader: read_sexfrequency_result - Description: Estimate a broad adult intimacy-frequency range from age, relationship stage, living pattern, childcare, stress, sleep, and self-rated desire; use it as a conversation starter, not a normality score. ## legal ### Blood Alcohol Calculator - Key: bac - Category: legal - Calculator: https://onecalculators.com/en/legal/bac - Guide: https://onecalculators.com/en/docs/bac - Widget: https://onecalculators.com/en/widget/legal/bac - WebMCP tool: calculate_bac - WebMCP result reader: read_bac_result - Description: Enter weight, sex, serving count, ABV, serving volume, and elapsed time to view a simplified BAC model, pure-alcohol grams, and modeled time to 0; education only, not driving, legal, or medical advice ### BAH Calculator - Key: bah - Category: legal - Calculator: https://onecalculators.com/en/legal/bah - Guide: https://onecalculators.com/en/docs/bah - Widget: https://onecalculators.com/en/widget/legal/bah - WebMCP tool: calculate_bah - WebMCP result reader: read_bah_result - Description: BAH example estimate by pay grade, duty-station ZIP code, and dependent status; official locality rates are not connected, so use DTMO for a real benefit lookup. ### Bail Estimate Example - Key: bail - Category: legal - Calculator: https://onecalculators.com/en/legal/bail - Guide: https://onecalculators.com/en/docs/bail - Widget: https://onecalculators.com/en/widget/legal/bail - WebMCP tool: calculate_bail - WebMCP result reader: read_bail_result - Description: Simplified bail amount example from offense category, severity, and page risk factors; no jurisdiction-specific rules, court prediction, or legal advice. ## math ### Absolute Value Calculator - Key: absolute - Category: math - Calculator: https://onecalculators.com/en/math/absolute - Guide: https://onecalculators.com/en/docs/absolute - Widget: https://onecalculators.com/en/widget/math/absolute - WebMCP tool: calculate_absolute - WebMCP result reader: read_absolute_result - Description: Calculate a single real number's absolute value, a basic |x| arithmetic expression, or the absolute difference between two numbers; no variables, functions, or complex modulus. ### Basic Calculator - Key: basic - Category: math - Calculator: https://onecalculators.com/en/math/basic - Guide: https://onecalculators.com/en/docs/basic - Widget: https://onecalculators.com/en/widget/math/basic - WebMCP tool: calculate_basic - WebMCP result reader: read_basic_result - Description: Handle addition, subtraction, multiplication, division, square root, and sign changes with memory keys, history, keyboard input, and fullscreen mode; no complex-expression parser. ### Binary Calculator - Key: binary - Category: math - Calculator: https://onecalculators.com/en/math/binary - Guide: https://onecalculators.com/en/docs/binary - Widget: https://onecalculators.com/en/widget/math/binary - WebMCP tool: calculate_binary - WebMCP result reader: read_binary_result - Description: Convert non-negative integers between binary, octal, decimal, and hexadecimal, or apply binary arithmetic and AND, OR, and XOR operations with binary and decimal output. ### Circle Calculator - Key: circle - Category: math - Calculator: https://onecalculators.com/en/math/circle - Guide: https://onecalculators.com/en/docs/circle - Widget: https://onecalculators.com/en/widget/math/circle - WebMCP tool: calculate_circle - WebMCP result reader: read_circle_result - Description: Derive radius, diameter, circumference, and area from one positive circle measurement, with clear length and square-unit distinctions. ### Decimal Fraction Converter - Key: decimalFraction - Category: math - Calculator: https://onecalculators.com/en/math/decimalFraction - Guide: https://onecalculators.com/en/docs/decimalFraction - Widget: https://onecalculators.com/en/widget/math/decimalFraction - WebMCP tool: calculate_decimalfraction - WebMCP result reader: read_decimalfraction_result - Description: Convert finite decimals to fractions and integer fractions to decimals, with automatic simplification and mixed-number output when applicable. ### Distance and Midpoint Calculator - Key: distance - Category: math - Calculator: https://onecalculators.com/en/math/distance - Guide: https://onecalculators.com/en/docs/distance - Widget: https://onecalculators.com/en/widget/math/distance - WebMCP tool: calculate_distance - WebMCP result reader: read_distance_result - Description: Calculate dx, dy, Euclidean distance, Manhattan distance, and midpoint from two 2D Cartesian points, not geographic coordinates. ### Equation Solver - Key: equation - Category: math - Calculator: https://onecalculators.com/en/math/equation - Guide: https://onecalculators.com/en/docs/equation - Widget: https://onecalculators.com/en/widget/math/equation - WebMCP tool: calculate_equation - WebMCP result reader: read_equation_result - Description: Enter separate coefficients to solve ax + b = c or a 2x2 system, classify one/no/infinite solutions, and view numeric steps. ### Mathematical Expression Calculator - Key: expression - Category: math - Calculator: https://onecalculators.com/en/math/expression - Guide: https://onecalculators.com/en/docs/expression - Widget: https://onecalculators.com/en/widget/math/expression - WebMCP tool: calculate_expression - WebMCP result reader: read_expression_result - Description: Evaluate numeric expressions with parentheses, powers, common functions, pi/e constants, implicit multiplication, and recent calculation history. ### Math Formula Editor - Key: formula - Category: math - Calculator: https://onecalculators.com/en/math/formula - Guide: https://onecalculators.com/en/docs/formula - Widget: https://onecalculators.com/en/widget/math/formula - WebMCP tool: calculate_formula - WebMCP result reader: read_formula_result - Description: Online math formula editor and LaTeX converter. Edit visually, paste source, sync MathML, download .tex/.xml, or export PNG; it is for layout, not evaluation or equation solving. ### Fraction Calculator - Key: fraction - Category: math - Calculator: https://onecalculators.com/en/math/fraction - Guide: https://onecalculators.com/en/docs/fraction - Widget: https://onecalculators.com/en/widget/math/fraction - WebMCP tool: calculate_fraction - WebMCP result reader: read_fraction_result - Description: Simplify, add, subtract, multiply, divide, or compare fractions using integer numerators and denominators. ### Greatest Common Factor Calculator - Key: gcf - Category: math - Calculator: https://onecalculators.com/en/math/gcf - Guide: https://onecalculators.com/en/docs/gcf - Widget: https://onecalculators.com/en/widget/math/gcf - WebMCP tool: calculate_gcf - WebMCP result reader: read_gcf_result - Description: Calculate the Greatest Common Factor (GCF/GCD) of two or more integers with shared factors and step-by-step work. ### Gematria Calculator - Key: gematria - Category: math - Calculator: https://onecalculators.com/en/math/gematria - Guide: https://onecalculators.com/en/docs/gematria - Widget: https://onecalculators.com/en/widget/math/gematria - WebMCP tool: calculate_gematria - WebMCP result reader: read_gematria_result - Description: Calculate English and Hebrew gematria, compare phrases across five ciphers, and see letter values and alphabet charts. ### Gravel Calculator - Key: gravel - Category: math - Calculator: https://onecalculators.com/en/math/gravel - Guide: https://onecalculators.com/en/docs/gravel - Widget: https://onecalculators.com/en/widget/math/gravel - WebMCP tool: calculate_gravel - WebMCP result reader: read_gravel_result - Description: Estimate gravel volume, tonnes, US tons and cost from dimensions, depth and bulk density. Supports metric/US units, circular areas and extra material. ### Least Common Multiple Calculator - Key: lcm - Category: math - Calculator: https://onecalculators.com/en/math/lcm - Guide: https://onecalculators.com/en/docs/lcm - Widget: https://onecalculators.com/en/widget/math/lcm - WebMCP tool: calculate_lcm - WebMCP result reader: read_lcm_result - Description: Calculate the least common multiple (LCM) of two or more integers with pairwise GCD/LCM steps and prime factor analysis. ### Logarithm Calculator - Key: logarithm - Category: math - Calculator: https://onecalculators.com/en/math/logarithm - Guide: https://onecalculators.com/en/docs/logarithm - Widget: https://onecalculators.com/en/widget/math/logarithm - WebMCP tool: calculate_logarithm - WebMCP result reader: read_logarithm_result - Description: Compute logarithms for any valid base, compare ln and log10, verify the change-of-base result, or evaluate a power directly. ### Long Division Calculator - Key: longDivision - Category: math - Calculator: https://onecalculators.com/en/math/longDivision - Guide: https://onecalculators.com/en/docs/longDivision - Widget: https://onecalculators.com/en/widget/math/longDivision - WebMCP tool: calculate_longdivision - WebMCP result reader: read_longdivision_result - Description: Enter non-negative integers to see quotient, remainder, the division identity, and a step-by-step decimal expansion; precision 0–12, without repeating-cycle detection. ### Matrix Calculator - Key: matrix - Category: math - Calculator: https://onecalculators.com/en/math/matrix - Guide: https://onecalculators.com/en/docs/matrix - Widget: https://onecalculators.com/en/widget/math/matrix - WebMCP tool: calculate_matrix - WebMCP result reader: read_matrix_result - Description: Enter 2x2 or 3x3 numeric square matrices by row for addition, subtraction, multiplication, transpose, determinants, and inverse. ### Percentage Calculator - Key: percentage - Category: math - Calculator: https://onecalculators.com/en/math/percentage - Guide: https://onecalculators.com/en/docs/percentage - Widget: https://onecalculators.com/en/widget/math/percentage - WebMCP tool: calculate_percentage - WebMCP result reader: read_percentage_result - Description: Calculate percentages, values, change rates, discounts, tax, tips, compound growth, and markup profit. ### Prime Number Calculator - Key: prime - Category: math - Calculator: https://onecalculators.com/en/math/prime - Guide: https://onecalculators.com/en/docs/prime - Widget: https://onecalculators.com/en/widget/math/prime - WebMCP tool: calculate_prime - WebMCP result reader: read_prime_result - Description: Check primality, factor integers, count positive divisors, find neighboring primes, and list primes in an inclusive range. ### Probability Calculator - Key: probability - Category: math - Calculator: https://onecalculators.com/en/math/probability - Guide: https://onecalculators.com/en/docs/probability - Widget: https://onecalculators.com/en/widget/math/probability - WebMCP tool: calculate_probability - WebMCP result reader: read_probability_result - Description: Calculate permutation and combination counts, binomial and Poisson point probabilities, expectation, variance, standard deviation, and coefficient of variation. ### P Value Calculator - Key: pvalue - Category: math - Calculator: https://onecalculators.com/en/math/pvalue - Guide: https://onecalculators.com/en/docs/pvalue - Widget: https://onecalculators.com/en/widget/math/pvalue - WebMCP tool: calculate_pvalue - WebMCP result reader: read_pvalue_result - Description: Calculate the z statistic and two-tailed P value for a one-sample z test from a sample mean, null mean, population SD, and sample size. ### Pythagorean Theorem Calculator - Key: pythagorean - Category: math - Calculator: https://onecalculators.com/en/math/pythagorean - Guide: https://onecalculators.com/en/docs/pythagorean - Widget: https://onecalculators.com/en/widget/math/pythagorean - WebMCP tool: calculate_pythagorean - WebMCP result reader: read_pythagorean_result - Description: Find a hypotenuse, solve a missing leg, or check whether three positive side lengths satisfy the Pythagorean relationship. ### Quadratic Equation Calculator - Key: quadratic - Category: math - Calculator: https://onecalculators.com/en/math/quadratic - Guide: https://onecalculators.com/en/docs/quadratic - Widget: https://onecalculators.com/en/widget/math/quadratic - WebMCP tool: calculate_quadratic - WebMCP result reader: read_quadratic_result - Description: Enter a, b, and c for ax²+bx+c=0 to see real, repeated, or complex roots, the discriminant, axis, and vertex. ### Ratio Calculator - Key: ratio - Category: math - Calculator: https://onecalculators.com/en/math/ratio - Guide: https://onecalculators.com/en/docs/ratio - Widget: https://onecalculators.com/en/widget/math/ratio - WebMCP tool: calculate_ratio - WebMCP result reader: read_ratio_result - Description: Simplify integer ratios, scale equivalent ratios, and solve one missing term with ordinary numeric values in a proportion. ### Rounding Calculator - Key: rounding - Category: math - Calculator: https://onecalculators.com/en/math/rounding - Guide: https://onecalculators.com/en/docs/rounding - Widget: https://onecalculators.com/en/widget/math/rounding - WebMCP tool: calculate_rounding - WebMCP result reader: read_rounding_result - Description: Round to 0-10 decimal places with round, ceiling, floor, truncate, and banker's modes, and view the original value and difference. ### Scientific Calculator - Key: scientific - Category: math - Calculator: https://onecalculators.com/en/math/scientific - Guide: https://onecalculators.com/en/docs/scientific - Widget: https://onecalculators.com/en/widget/math/scientific - WebMCP tool: calculate_scientific - WebMCP result reader: read_scientific_result - Description: Scientific calculator with trig, logs, exponents, powers, roots, factorials, permutations, combinations, memory, history, and DEG/RAD mode. ### Significant Figures Calculator - Key: sigfig - Category: math - Calculator: https://onecalculators.com/en/math/sigfig - Guide: https://onecalculators.com/en/docs/sigfig - Widget: https://onecalculators.com/en/widget/math/sigfig - WebMCP tool: calculate_sigfig - WebMCP result reader: read_sigfig_result - Description: Count significant figures and apply decimal-place or sig-fig rules to addition, subtraction, multiplication, and division. ### Slope Calculator - Key: slope - Category: math - Calculator: https://onecalculators.com/en/math/slope - Guide: https://onecalculators.com/en/docs/slope - Widget: https://onecalculators.com/en/widget/math/slope - WebMCP tool: calculate_slope - WebMCP result reader: read_slope_result - Description: Calculate rise, run, slope, y-intercept, distance, and a line equation from two distinct coordinate points, including horizontal and vertical lines. ### Square Footage Calculator - Key: square-footage - Category: math - Calculator: https://onecalculators.com/en/math/square-footage - Guide: https://onecalculators.com/en/docs/square-footage - Widget: https://onecalculators.com/en/widget/math/square-footage - WebMCP tool: calculate_square_footage - WebMCP result reader: read_square_footage_result - Description: Calculate square feet for rooms, floors and combined areas. Up to 10 areas. Add separate areas. Subtract cutouts only once. ### Test Grade Calculator - Key: test-grade - Category: math - Calculator: https://onecalculators.com/en/math/test-grade - Guide: https://onecalculators.com/en/docs/test-grade - Widget: https://onecalculators.com/en/widget/math/test-grade - WebMCP tool: calculate_test_grade - WebMCP result reader: read_test_grade_result - Description: Calculate a percentage, A–F letter grade, and fixed 4.0-scale GPA from wrong answers, correct answers, or points. Adjust A/B/C/D cutoffs; no plus/minus, weighted, or curved grading. ### Triangle Calculator - Key: triangle - Category: math - Calculator: https://onecalculators.com/en/math/triangle - Guide: https://onecalculators.com/en/docs/triangle - Widget: https://onecalculators.com/en/widget/math/triangle - WebMCP tool: calculate_triangle - WebMCP result reader: read_triangle_result - Description: Solve supported three-side, side-angle, one-side-two-angle, and right-triangle inputs for sides, angles, area, perimeter, heights, and radii. ### Z-Score Calculator - Key: zscore - Category: math - Calculator: https://onecalculators.com/en/math/zscore - Guide: https://onecalculators.com/en/docs/zscore - Widget: https://onecalculators.com/en/widget/math/zscore - WebMCP tool: calculate_zscore - WebMCP result reader: read_zscore_result - Description: Enter a value, mean, and positive standard deviation to get a z-score, normal-model percentile, left-tail cumulative probability, and deviation category.