About the Percentage Calculator
Six percentage calculators in one place. Work out a percentage of a number, what percentage one number is of another, the percent change between two values, and apply a percentage increase or decrease.
How to use it
- Find the calculation that matches your question.
- Enter the two values.
- The answer appears instantly.
Formula & method
X% of Y = X ÷ 100 × Y
% change = (new − old) ÷ |old| × 100Frequently asked questions
How do I calculate a percentage increase?
Subtract the old value from the new value, divide by the old value and multiply by 100. From 80 to 100 is (100 − 80) ÷ 80 × 100 = 25%.
Results are estimates for general information only and are not financial, tax, legal or medical advice. Please confirm important decisions with a qualified professional.