Three common questions, answered
Percentage Calculator
Solve X% of Y, find what percent one value is of another, or calculate a percentage increase or decrease.
Loading this tool…
How to use it
Three steps. That’s it.
- 1
Choose the percentage question that matches your problem.
- 2
Enter both values; decimals and negative values are supported.
- 3
Read the answer and the formula used.
Good to know
Frequently asked questions
How do I find 20% of a number?
Multiply the number by 20 and divide by 100. For example, 20% of 80 is 16.
How is percentage change calculated?
Subtract the starting value from the new value, divide by the absolute starting value, then multiply by 100.
Can percentage change start at zero?
A standard percentage change from zero is undefined because it would require division by zero. The calculator explains this case.
Keep going