Ratio Calculator | Solve Proportions and Ratios

Solve ratio problems and proportions. Calculate missing values in ratios A:B = C:D.

Ratio Calculator
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How to use

  • Enter any three values in the ratio equation A : B = C : D.
  • The tool will calculate the missing fourth value.
  • Alternatively, enter A and B to simplify the ratio.

About Ratios

A ratio indicates how many times one number contains another.

Representation

Ratios are often written as A:B or A/B.

Features

  • Solve for missing value
  • Simplify ratios
  • Aspect ratio calculation

Applications

  • Screen resolutions
  • Cooking recipes scaling
  • Financial analysis