Percentage Calculator
Percent of, ratio and change.
- 100% free
- No sign-up
- Runs in your browser
Three questions, instant answers
What's 15% of 200? 30 is what percent of 120? How much did a price change from 80 to 100? Type into any row and the answer updates as you go.
Percentage change is measured against the starting value, so going up 50% and then down 50% doesn't bring you back where you started.
- 1
Pick the right row
Of, ratio or change.
- 2
Type your numbers
Results update live.
- 3
Use the answer
Rounded to four decimals.
Frequently asked questions
How do I calculate percentage increase?
(New − Old) ÷ Old × 100. The third row does it for you.
What's the difference between percent and percentage points?
Going from 10% to 12% is 2 percentage points, but a 20% increase.
Is my data uploaded anywhere?
No. Everything runs in your browser with JavaScript — nothing you type or open is sent to our servers.