Percentage Calculator
Calculate percentages in 5 different modes — instantly, in your browser.
Enter values above to see the result
All calculations happen instantly in your browser — nothing is sent to any server.
Frequently asked questions
How do I calculate what percentage one number is of another?
Use the 'What % is X of Y?' mode. Divide X by Y and multiply by 100. For example, 25 out of 80 = (25/80)×100 = 31.25%.
How do I calculate a percentage increase or decrease?
Use the '% change' mode. The formula is ((new − old) / |old|) × 100. A positive result is an increase; negative is a decrease.
How do I add or subtract a percentage from a number?
Use 'Add %' or 'Subtract %'. Adding 20% to 150 = 150 × 1.20 = 180. Subtracting 20% = 150 × 0.80 = 120.
What is 'X% of Y'?
Multiply X/100 by Y. For example, 15% of 200 = (15/100) × 200 = 30.