What This Calculator Does

This ratio page combines three of the most common tasks in one place. First, reducing a ratio to lowest terms. Second, generating equivalent ratios from a scale factor. Third, solving a missing term in a : b = c : d. Keeping those tasks together means you do not need to jump among separate tools for problems that are really part of the same ratio workflow.

It is especially useful for classroom work, scaling problems, mixture questions, simple business ratios, and day-to-day comparison tasks. The page also shows decimals, percentages, and cross products, which makes it better for checking setup quality instead of only giving one final answer.

When to Use It

• You want to reduce a ratio to lowest terms.
• You need to create an equivalent ratio at a chosen scale.
• You want to solve a missing term in a : b = c : d.
• You want to see a ratio in decimal and percentage form as well.
• You are doing classwork, scaling, recipe comparison, or simple business proportions.

Inputs Explained

Mode

The current page supports three modes.

• simplify for ratio reduction
• equivalent for scaled equivalent ratios
• proportion for solving one missing term

Simplify and Equivalent Modes