💯 Percentage Calculator

About this Percentage Calculator

This percentage calculator handles the three percentage questions people ask most: finding a percentage of a number, working out what percent one number is of another, and measuring the percentage change between two values. It is handy for discounts, exam marks, tips, price changes and quick everyday maths.

How to use it

1. Choose the type of percentage question from the Mode list.
2. Type the two numbers X and Y.
3. Click Calculate to see the answer.

Example

15% of 240 = 36. Also, 45 is 18.75% of 240, and going from 240 to 300 is a 25% increase.

Frequently asked questions

What is the formula for X% of Y?

Multiply Y by X and divide by 100. For example, 15% of 240 is 240 x 15 / 100 = 36.

How do I find the percentage change?

Subtract the old value from the new value, divide by the old value, then multiply by 100. A positive result is an increase, a negative result is a decrease.

Can I use decimal numbers?

Yes. Both fields accept decimals, so values like 12.5% of 99.99 work fine.

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