Percentage Calculator
Every common percentage question in one place.
Enter two values and read all three answers. Percent change is positive for an increase and negative for a decrease.
Formula: A % of B = A × B ÷ 100. Change = (B − A) ÷ A × 100
Results are estimates for general information, not medical or financial advice.
How it works
- Enter your values The result updates as you type.
- Switch units if needed Metric or US units, where it applies.
- Read the result Nothing is stored or sent anywhere.
FAQ
Is it free?
Yes. No account, no limits.
Is my data stored?
No. The calculation happens in your browser and nothing is sent to a server.