Percentage Calculator

Find a percentage of a number, what percent one number is of another, percentage change, and percentage increase or decrease.

Percentages show up everywhere: discounts, marks, tips, tax, salary hikes and investment returns. This calculator covers the five everyday questions:

The formula used is shown with every answer, so you can check it yourself.

Frequently asked questions

How do I calculate a percentage of a number?

Divide the percentage by 100 and multiply by the number. For example, 15% of 200 = 15 ÷ 100 × 200 = 30.

How do I calculate percentage change?

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

Is a 10% increase followed by a 10% decrease the same as the original?

No. 100 increased by 10% is 110, and 110 decreased by 10% is 99. The decrease is taken on the larger number.