Everyday utility

Ratio Calculator

Simplify ratios, check proportions, and solve for missing values in equivalent ratios. Use this Data and utilities tool to enter your numbers, review the result, and understand the key assumptions before making the next decision.

What you get
A focused calculator, clear explanation, common questions, and useful next tools.
Quick intro
Calculator
Result
Explanation
Common questions
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Calculator tool

How this calculator works
The result depends on the numbers you enter and the assumptions shown below.

A ratio compares two quantities. To simplify, divide both parts by their GCD. Proportions (a:b = c:d) can be solved by cross-multiplication: a×d = b×c.

Review the inputs carefully and treat the output as an estimate. For decisions involving money, taxes, health, law, or security, compare the result with trusted professional guidance when needed.

Frequently asked questions

How do I simplify a ratio?

Divide both parts of the ratio by their greatest common divisor (GCD). For example, 12:8 → GCD is 4 → simplified to 3:2.