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Ratio Calculator — Simplify & Solve Proportions

Simplify ratios to lowest terms and solve proportions. Find the missing value in A:B = C:?. Gratuit, sans inscription, fonctionne dans votre navigateur.

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All calculations happen locally in your browser. No data is sent to any server.

À propos de Ratio Calculator

This ratio calculator has two modes. In Simplify mode, enter any ratio (like 12:8) and the calculator reduces it to lowest terms (3:2) using the greatest common factor. It also shows the decimal and fraction equivalents. In Solve Proportion mode, enter three values of A:B = C:D and leave one blank — the calculator finds the missing value using cross-multiplication. Works with decimals and handles the math instantly in your browser. No data is sent to any server.

Questions fréquentes

How do you simplify a ratio?
Divide both numbers by their greatest common factor (GCF). For example, 12:8 → GCF is 4 → 3:2. The calculator does this automatically.
How do you solve a proportion?
Use cross-multiplication. For A:B = C:D, if D is unknown: D = (B × C) / A. Enter three values and leave one blank to solve.
Can I use decimals?
Yes. The calculator handles decimal ratios like 2.5:1.5 and simplifies them correctly by scaling to whole numbers first.

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