Ratio Calculator

Simplify ratios, find equivalent ratios, and solve ratio proportions.

Value A

Value B

How It Works

Simplify: Reduce the ratio to its simplest form by dividing by the GCD. Scale: Multiply both values by a factor. Solve: Given A:B = C:X, find the missing value X.

Simplify: A:B → A/GCD : B/GCD | Proportion: A/B = C/X → X = B·C/A

About this Calculator

The Ratio Calculator is a free, easy-to-use tool for proportion, simplify, scale. Simply enter your values and get instant, accurate results — no signup, no ads, no tracking. All calculations run locally in your browser, so your data stays completely private.

Privacy Note: All calculations are performed locally in your browser. No data is ever sent to a server or third party.