Math
Percentage Calculator
Find a percentage of a number, figure out what percent one number is of another, and calculate percent increase or decrease.
How percentage calculations work
A percentage expresses a number as a fraction of 100. To find X% of Y, multiply Y by X and divide by 100. To find what percent one number is of another, divide the part by the whole and multiply by 100. Percent change compares a starting and ending value relative to the starting value.