Ratio Calculator
Solve proportion equations (A:B = C:D) and reduce ratios to simplest form.
1. Solve Missing Ratio (A : B = C : D)
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Leave any ONE field empty to calculate its value.
2. Simplify Ratio (A : B)
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How It Works
Proportions use cross-multiplication (A * D = B * C). Ratio simplification divides both terms by their Greatest Common Divisor (GCD).