Solve percentage problems in seconds — find what a percentage of a number is, or work out the percentage change between two values. Free, instant and no sign-up needed.
What is X% of Y?
Percentage change from A to B
How to Use
- For a percentage of a number: enter the percentage and the number, then click Calculate.
- For percentage change: enter the original value and the new value, then click Calculate.
- Read the answer instantly, including whether the change is an increase or a decrease.
Key Features
- Two calculators in one — percentage of a number and percentage change.
- Increase/decrease wording so the result is instantly clear.
- Smart validation for missing figures and division by zero.
- Works with decimals and negatives, not just whole numbers.
- 100% private — everything runs in your browser.
FAQs
Is this percentage calculator free?
Yes. It is completely free with no sign-up and no limits.
How do you calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number. For example, 20% of 150 is (20 ÷ 100) × 150 = 30.
How is percentage change calculated?
Subtract the original value from the new value, divide by the original value and multiply by 100. A positive result is an increase; a negative result is a decrease.
Can it handle decimals and negative numbers?
Yes. Both calculators accept decimal and negative values.