The Ratio Calculator does two jobs: it simplifies a ratio to its lowest whole-number terms, and it solves proportions of the form A:B = C:D by finding the missing value. It also expresses ratios as decimals and fractions.
Simplify and solve ratios
In simplify mode, enter two terms and the calculator reduces them using the greatest common divisor — turning 16:9 or 1920:1080 into their simplest form. In proportion mode, fill in three of the four values in A:B = C:D and leave one blank to solve for it, perfect for scaling recipes, maps and mixtures.
Two modes
- Simplify a ratio to lowest terms
- Solve a proportion for the unknown value
- See decimal and fraction equivalents
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