Percentage Calculator
Every percentage question, answered instantly.
Runs on your device
At a glance
- Input:
- Numbers you enter
- Processing:
- Runs locally in your browser
- Privacy:
- Your files stay on your device — nothing is uploaded to a server
About this tool
The everyday percentage toolkit: find a portion of a value, compare two values as a share, or measure growth between them — with clean instant math and no ads in your way.
How to use it
- Pick the question you're actually asking.
- Enter two numbers.
- Read the answer with its working shown.
Frequently asked questions
How do I calculate 20% of 500?
Choose the 'What is X% of Y' mode, enter 20 and 500 — the answer 100 appears immediately.
How does percent change work?
Change = (new − old) ÷ old × 100. A negative result means a decrease. The tool labels it for you so sign confusion can't mislead.
Are results rounded?
Results show up to 4 decimal places and strip trailing zeros; full precision is used internally.