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Ratio Calculator

Simplify ratios, scale them up and share a total by any ratio.

Calculators Reviews Free · no sign-up

Simplify a ratio

:

—

Solve for a missing term

Fill in three boxes and leave one blank.

: = :

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Share a total by a ratio

Quick Tool Overview

The Ratio Calculator does three ratio jobs in one place: reduce a ratio to its simplest form, find the missing number in a pair of equivalent ratios, and share a total amount out in a given ratio. Each shows the multiplier or divisor it used.

What it does
Simplifies, scales and shares out by ratio
You give it
A ratio, and a total when you are sharing one out
You get back
The simplified ratio, the missing term or each share
Best for
Recipes, mixing, partnerships, aspect ratios and scale drawings
Calculators Free, unlimited use No sign-up Runs in your browser

About the Ratio Calculator

Three ratio jobs in one place: reduce a ratio to its simplest form, find the missing number in a pair of equivalent ratios, and share a total amount out in a given ratio. Each one shows the multiplier or divisor it used, so the arithmetic is checkable.

Ratios turn up more often than they get named. Mixing concrete, scaling a recipe for a different number of people, splitting profit between partners, working out an aspect ratio, or reading a scale on a drawing are all the same operation. The sharing calculator is the one worth bookmarking: to split 4,500 in the ratio 2:3:4 you divide by the total number of parts, nine, and multiply back up, which is not something most people want to do by hand twice.

Key features of the Ratio Calculator

Three calculators in one

Simplify, solve for a missing term, and share a total — the three things people actually do with ratios.

Sharing by parts done properly

Splitting 4,500 in the ratio 2:3:4 divides by the nine total parts and multiplies back up, which nobody wants to do by hand twice.

Multipliers shown

The number used to scale or reduce is printed, so the arithmetic is checkable.

Works with more than two terms

Three-part and longer ratios are supported, which is what profit splits and mixes usually need.

Exact reduction

Ratios are reduced by their greatest common divisor rather than approximated.

How to use the Ratio Calculator

  1. 1

    Simplify a ratio

    Enter both terms and the calculator divides them by their greatest common divisor to give the lowest whole-number form.

  2. 2

    Solve for a missing term

    Fill in three of the four boxes in A : B = C : D and the fourth is worked out by cross-multiplying.

  3. 3

    Share out a total

    Enter an amount and a ratio such as 2:3:4 to see how much each share is worth.

Frequently asked questions

Divide both sides by their greatest common divisor. 18:24 has a divisor of 6, so it simplifies to 3:4. The calculator shows the divisor it used.

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