Ratio Calculator

Simplify a ratio, or solve a proportion for the missing number.

Simplify a ratio A : B

Simplified

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Solve A : B = C : ?

Missing value

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Working with ratios

To simplify a ratio, divide both sides by their greatest common divisor. To solve a proportion A:B = C:x, cross-multiply: x = (B × C) ÷ A. Ratios are used in cooking, maps, finance, mixing and many everyday tasks.