Percentage Calculator
Find a percentage of a number, what percent one number is of another, and percentage change.
What is a percentage calculator?
A percentage calculator works out percentages for you: what a percentage of a number is, what percent one number is of another, and how much a value has changed in percent. It is useful for discounts, tips, grades, taxes and everyday maths.
How to use the percentage calculator
Choose the mode you need, enter the two values, and click Calculate. For “What is X% of Y?”, enter the percentage as X and the number as Y — for example, X = 15 and Y = 240 gives 36.
Formula
X% of Y = (X ÷ 100) × Y. To find what percent X is of Y: (X ÷ Y) × 100. Percentage change = (new value − old value) ÷ old value × 100.
Example
15% of 240 = (15 ÷ 100) × 240 = 0.15 × 240 = 36.
Frequently Asked Questions
What is 15% of 240?
15% of 240 is 36. Try it on the calculator above.
How do you find what percent one number is of another?
Divide the first number by the second and multiply by 100. For example, 36 is 15% of 240 because (36 ÷ 240) × 100 = 15.
How do you calculate percentage increase?
Subtract the old value from the new value, divide by the old value, and multiply by 100. Use the “% change from X to Y” mode above.
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