How to use the Percentage calculator
- 1Pick the line that matches your question.
- 2Type the two numbers.
- 3Read the answer on the right and copy it.
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Frequently asked questions
How do I calculate percentage change?
(new − old) ÷ old × 100. From 80 to 100 is +25%; from 100 to 80 is −20% — the base is always the starting value.
How do I add 15% to a price?
Use the last line: enter the price and 15. For example 200 increased by 15% is 230; use −15 for a decrease.
Is my data sent anywhere?
No. Everything is calculated in your browser on your own device — nothing you type or upload is sent to a server.