Percentage Calculator
X% of a number, what percent one number is of another, and percentage increase or decrease, in one place.
Answer
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How to use the Percentage calculator
- Enter calculate, a and b.
- Read the answer at the top of the result. It updates as you type.
- Change one input at a time to see what moves the answer most, then save the result with Copy link or Download PDF.
About this tool
Three common percentage questions in one tool. Change the first box to switch between them.
Worked example
With calculate of What is A% of B?, a of 18 and b of 2,500:
| Answer | 450 |
Built and reviewed by Savitar Finance (savitarfinance@gmail.com). Rules and rates last checked October 2026. How we calculate · Report a problem
Questions people ask
How do I calculate percentage increase?
(new − old) ÷ old × 100. From 80 to 100 is a 25% increase.
How do I find what percent A is of B?
A ÷ B × 100. 45 of 60 is 75%.