Ratio Calculator
Simplify a ratio to its lowest terms, see it as a decimal and percentage split, and scale it up or down.
Set a new value for A and we'll work out the matching B.
Result
Simplified ratio
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Enter both parts of the ratio to simplify it.
Enter the two parts of a ratio to reduce it to its simplest form. Optionally set a new value for the first part and we'll scale the second part to keep the ratio the same.
Frequently asked questions
How do I simplify a ratio?
Divide both parts by their greatest common divisor (GCD). For example, 16:12 both divide by 4, giving 4:3. This calculator does that automatically for whole numbers.
Can I use decimals in a ratio?
Yes. If either part isn't a whole number, the ratio is normalised to the form 1 : x so you can still compare it easily.