How the math works
X% of Y = Y × X / 100. A is what % of B = A / B × 100.
Example
- Choose the question you need answered.
- Enter the two numbers.
- Use the result in a shopping or budget decision.
Catch the catches
- Percentages without the base amount are not comparable. Always convert to money.
Questions
Are these calculators free?
Yes. They run in your browser. You do not need an account, and we do not require personal financial data to use them.
Should I treat the result as a bank or store quote?
No. Results are educational math. Merchants, lenders, and tax rules can differ. Verify the live terms before you pay.