⚖️ Ratio Calculator

Simplify ratios, find missing values, scale ratios, and check if two ratios are equivalent.

Simplify a Ratio

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Simplified Ratio
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As Fraction
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As Decimal
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As Percentage
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Find Missing Value (A : B = C : ?)

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Missing Value (D)
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About Ratios

A ratio compares two or more quantities. The ratio 6:9 means "6 of the first for every 9 of the second." Ratios can be expressed as fractions, decimals, or percentages.

If A:B = C:D, then A×D = B×C (cross-multiplication)
Missing D = (B × C) / A

Real-World Uses

  • Recipe scaling (doubling or halving ingredients)
  • Map scales (1:50,000 means 1cm = 500m)
  • Financial ratios (P/E ratio, debt-to-equity)
  • Screen aspect ratios (16:9, 4:3, 21:9)