About the Percentage to Ratio Calculator
Turn a percentage into a simplified ratio, e.g. 40% → 2:3 (part to rest) or 2:5 (part to whole).
Also known as: percent to ratio, convert percentage to ratio.
How to use this calculator
- Enter percentage.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
p% → p : (100 − p)
Worked example
Using the values pre-filled in the calculator above:
- Percentage = 40 %
the calculator returns:
- Part : rest: 2 : 3
- Part : whole: 2 : 5