Three calculators in one: percent of a number, what percent one number is of another, and percentage change.
🔒 Calculations happen instantly in your browser.
How to use the percentage calculator
- Pick the calculation you need.
- Type your numbers.
- Read the answer and the formula used.
Percentage formulas
X% of Y = X / 100 x Y. X is what % of Y = X / Y x 100. Percentage change = (new – old) / old x 100.
Frequently 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.
What is 20% of 150?
30. Multiply 150 by 0.20.
How do I calculate a discount?
Use X% of Y to get the discount amount, then subtract it from the original price.