What This Calculator Does

Keep integer ratio simplification, equivalent scaling and missing-proportion solving, and divide a total into two or three ratio shares. Currency mode uses the largest remainder method in integer minor units so the allocated units sum exactly to the total.

When to Use It

Simplify 12:18, generate multiples of 2:3, solve 4:7=x:21, or divide a budget or quantity in ratios such as 2:3 or 1:1:1. Use the fraction calculator for fraction arithmetic and the percentage calculator for percentage changes.

Inputs Explained

Simplify and equivalent modes use integers with absolute values up to 1 billion. The second term cannot be zero. Signed integers are supported, with a negative denominator sign moved to the first term. Scaling uses a whole factor from 1 to 1,000,000, applied to the simplified ratio; reference multiples 1–5 are also shown.

Proportion mode needs three finite numbers and exactly one blank field. Dot/comma decimals and scientific notation are accepted, within ±1 trillion. In the completed a:b=c:d, b and d cannot be zero; the denominator used to solve the missing value must also be nonzero.

Split mode accepts two or three nonnegative integer terms up to 1 billion each, at least one positive, and a total from 0 to 1 trillion. A zero term receives zero. Negative totals and negative split weights are invalid.

Ordinary-number mode returns ideal proportional shares with rounded display. Currency mode explicitly selects 0–3 decimal places for the smallest unit: 0 means whole units, 2 means 0.01 and 3 means 0.001. A total with more decimal digits than the chosen unit is rejected rather than silently rounded. No exchange rates, taxes or automatic currency rules are applied.

Editing clears the previous result; calculate again to update. Existing URL fields restore simplify, equivalent and proportion inputs; new split fields are also preserved in the calculated URL.