About this percentage calculator
This free percentage calculator solves the three questions people ask most often. Use "What is P% of a number" for discounts, sales tax and tips (20% of $150 = $30). Use "X is what percent of Y" for grades, test scores and proportions (45 out of 180 = 25%). Use "percentage increase / decrease" for price changes, growth and weight loss (50 → 65 is a 30% increase). Every result updates instantly as you type and nothing is sent to a server.
Frequently asked questions
- How do I calculate what is X% of a number?
- Enter the percentage and the number in the first calculator — e.g. 20% of 150 gives 30.
- How do I work out what percentage one number is of another?
- Use the second calculator — 45 is what percent of 180 gives 25%.
- How do I calculate a percentage increase or decrease?
- Use the third calculator — from 50 to 65 is a 30% increase; from 80 to 60 is a 25% decrease.