How Ratio Calculator works

Simplify ratios with two or more parts, or solve an equivalent ratio with one missing value.

The formula

Ratio parts are scaled to integers and divided by their greatest common divisor. Equivalent ratios use cross multiplication.

A practical example

50 : 100 simplifies to 1 : 2, while 2 : 3 = 10 : ? gives 15.

Important limitations

Decimal ratio parts support up to eight decimal places.

Frequently asked questions

Can I simplify three-part ratios?

Yes. Enter values such as 10:20:30.

Can ratio parts be decimals?

Yes. They are scaled before exact greatest-common-divisor reduction.