Percentage Calculator
Find percentages, compare values, and calculate percentage increases or decreases.
Processed in your browserA simpler way to use the percentage calculator
Solve three everyday percentage questions: find a percentage of a number, express one value as a percentage of another, or compare a new value with an original positive value. Results retain up to six decimal places. A percentage change from zero has no defined result.
How it works
- Select the percentage question you want to answer.
- Enter the two values requested by the form.
- Calculate and check the formula shown alongside your result.
Your data stays with you.
Your file and form inputs don’t leave your device. This tool works locally in your browser. We only save recently opened tool names and optional feedback on this device.
What does Percentage Calculator do?
Find percentages, compare values, and calculate percentage increases or decreases.
- Cost and account
- Free to use. No account required.
- Processing
- In this browser
- Device requirements
- Desktop, tablet or phone with a supported modern browser; file and memory limits still apply.
Frequently asked questions
How is percentage change calculated?
For a positive original value, percentage change is (new − original) ÷ original × 100. A negative result is a decrease.
Why can’t I divide by zero?
A zero denominator has no defined percentage. Enter a nonzero total, or a positive starting value for percentage change.
Can I use decimal values?
Yes. Inputs accept decimals and results show up to six decimal places. As with most browser arithmetic, tiny floating-point rounding differences are possible.