Simplify
Divide both terms by their greatest common divisor. 12:18 becomes 2:3.
Math
Ratio Calculator
Simplify ratios, find equivalent ratios, and solve missing values in proportions.
Calculator
RATIO CALCULATOR
Compare quantities with ratios
Simplify a ratio or solve for a missing value in an equivalent ratio.
:=2 : 3
:=:20
12 : 18 simplifies by dividing both terms by their greatest common divisor.
How ratio calculations work
Equivalent ratios
Multiplying or dividing both terms by the same non-zero number preserves the ratio.
Proportion
a:b = c:x → x = (b × c) ÷ a