Percentage Calculator

Solve the three most common percentage problems in one place: what is X% of Y, X is what percent of Y, and the percentage increase or decrease between two numbers. Results update as you type.

About this tool

This percentage calculator solves the three most common problems: finding X% of a number, working out what percent one number is of another, and calculating the percentage increase or decrease between two values. It is useful for discounts, tips, marks, taxes, sales growth and price changes.

How to use the Percentage Calculator

1. Enter your numbers in any of the three boxes.
2. Read the answer instantly.
3. Change values to try other cases.

Why use this tool?

It is 100% free, needs no signup, gives instant results and works on desktop, tablet and mobile. Your data is processed in your browser and is not stored on our servers.

Frequently asked questions

How do I calculate percentage change?

Subtract the old value from the new value, divide by the old value and multiply by 100.

How do I find a discount?

Use “What is X% of Y” with the discount percent and the price.

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 20% of 150 is 150 × 20 / 100 = 30.

How is percentage change calculated?

Subtract the old value from the new value, divide by the old value and multiply by 100.

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