Free everyday calculator
Calculate a percentage of a number, find what percent one number is of another, or measure percentage change.
Result
Enter values and calculate.
How this calculator works
Select the percentage question you need. The calculator applies the matching formula and shows the substituted values so the result is easy to verify.
Worked example
15% of 200 is 30. A change from 80 to 100 is a 25% increase.
Frequently asked questions
How do I find a percentage of a number?
Divide the percentage by 100, then multiply by the number.
How is percentage change calculated?
Subtract the original value from the new value, divide by the absolute original value, then multiply by 100.
Can results be negative?
Yes. Negative inputs and percentage decreases can produce negative results where mathematically valid.