Ratio Calculator

Simplify and solve ratios between quantities, find equivalent ratios and calculate missing values.

Ratio Formulas

Simplifying: Divide every term by the greatest common divisor. Equivalent ratio: A : B = (A × k) : (B × k) Proportion: A : B = C : D A × D = B × C Splitting a quantity: Part A = Total × A ÷ (A + B) Part B = Total × B ÷ (A + B)

How to Use the Ratio Calculator

1

Choose a Calculation

Simplify a ratio, generate an equivalent ratio, solve a missing value or split a quantity.

2

Enter the Values

Enter the ratio terms and any additional values required.

3

Calculate

The calculator displays the simplified ratio, equivalent ratio or solved values.

Common Uses of Ratios

Recipes & Mixtures

Scale ingredient quantities while keeping proportions consistent.

Sharing Quantities

Divide money, materials or other quantities according to a ratio.

Scale & Proportion

Use ratios to compare measurements and scale drawings or models.

Data & Analysis

Compare quantities and relationships between groups or measurements.

Frequently Asked Questions

Divide every part of the ratio by the greatest common divisor of all the terms. For example, 12:18 simplifies to 2:3.
Equivalent ratios have the same proportional relationship. Multiplying or dividing every term of a ratio by the same non-zero number produces an equivalent ratio.
Set the two ratios equal and use cross multiplication. For example, if A:B = C:x, then x = B × C ÷ A.
Yes. Ratios can contain decimals, but multiplying all terms by the same factor can convert them to whole numbers before simplifying.

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Unit Converter

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