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Ratio & Proportion Calculator

Solve ratios and proportions with missing values

Solve Proportion: A : B = C : D

: = :

Simplify Ratio

: =
3:2

How it works

  • Solve for the unknown in A:B = C:D
  • Leave one field empty to solve for it
  • Simplify any ratio using GCD

Want to learn more?

Read the complete guide with examples and tips

Read guide