What is a Ratio?
A ratio compares two quantities. 3:6 simplifies to 1:2, meaning for every 1 of the first quantity there are 2 of the second.
Simplified Ratio = A/GCD : B/GCD
Solve a Proportion
If A:B = C:?, then ? = B×C/A.
Ratio Calculator
Simplify ratios to lowest terms, scale them up or down, and solve for a missing value in a proportion.