About this percentage calculator
Use this free percentage calculator for discounts, marks, budgets, price changes, tips and everyday maths. Enter your values to calculate common percentage problems quickly.
How to use this tool
- Choose the calculation you need: percentage of a number, what percentage one value is of another, or percentage change.
- Enter the requested numbers.
- Select Calculate to see the result. The calculator handles invalid inputs and division by zero.
Frequently asked questions
How do I calculate X percent of Y?
Divide X by 100 and multiply the result by Y. For example, 15% of 200 is 30.
How do I find what percentage X is of Y?
Divide X by Y and multiply by 100. Y must not be zero.
How is percentage change calculated?
Subtract the original value from the new value, divide by the absolute original value, then multiply by 100. A zero original value cannot be used.