Find a percentage of a number

Use this when the question gives you a percentage and a number, then asks for the resulting amount.

Find what percent one number is of another

Use this when you know the part and the whole but need to express their relationship as a percentage.

Calculate percentage change

Use percentage change when one value is specifically the starting point and the other is the new value.

A positive answer is an increase. A negative answer is a decrease. If the original value is zero, a finite percentage change is not defined.

Increase or decrease a number by a percentage

Convert the percentage into a multiplier, then apply it to the starting number.

Percentage points are not percentage change

If a rate moves from 20% to 25%, it increased by 5 percentage points. Relative to the original 20%, that is a 25% percentage increase.

Rounding percentage answers

Keep extra decimal places while calculating, then round only the final result. This calculator displays up to ten decimal places and removes trailing zeros. For money, follow the currency precision and rounding rules that apply to your situation.