Free Tool

Ratio & Proportion Calculator

Simplify ratios, solve proportions, and scale recipes or maps.

Reduce a ratio to its simplest form.

Find the missing value in A:B = C:D

D (leave blank to solve)

Scale a ratio up or down by a factor. Useful for recipes, maps, and models.

Original A

Original B

Scale Factor

Split a total into a 3-part ratio (e.g. split $900 in ratio 2:3:4)

Total Amount

Part A

Part B

Part C

RATIO & PROPORTIONS