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Explore all four ratio calculators, information pages and language versions.

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Ratio Calculator & Simplifier — Reduce whole-number or decimal ratios to their simplest integer form and see each part’s share of the total.
Proportion Calculator — Find the Missing Value — Solve a missing value anywhere in A:B = C:D using exact cross multiplication.
Equivalent Ratios Calculator — Scale both sides of a ratio by the same factor and check the reduced form.
Ratio Sharing Calculator — Divide a Total — Split a quantity into two shares according to a ratio, with exact fractions and percentages.