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Ratio Calculator

Simplify ratios, solve proportions, and scale ratios to a target value.

Simplify a Ratio A : B
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Proportion Solver: A/B = C/?
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Ratio Calculator — Frequently Asked Questions

It simplifies ratios, finds a missing value in a proportion, and scales ratios up or down.

Enter three of the four values and the tool calculates the missing one to keep the proportion equal.

Yes, it reduces any ratio to its simplest whole-number form.