About this tool
Calculate percentages, percentage of a total, and percentage change.
This tool runs directly in your browser and does not require an API call.
FREE ONLINE TOOL
Percentage Calculator
Calculate percentages, percentage of a total, and percentage change.
Percentage Tools
How to use the Percentage Calculator
Solve common percentage questions without working through the formula by hand. Calculate a percentage of a number, determine what percentage one number is of another, or measure percentage change.
How the calculation works
For X% of Y, multiply Y by X ÷ 100. To find what percent X is of Y, divide X by Y and multiply by 100. Percentage change compares the difference with the starting value.
Example / tip
25% of 200 is 50. If a price rises from 80 to 100, the increase is 25%.
Frequently asked questions
How do I find 20% of a number?
Multiply the number by 0.20.
How do I calculate percentage increase?
Subtract the old value from the new value, divide by the old value, then multiply by 100.
Can the percentage change be negative?
Yes. A negative result represents a decrease from the starting value.