Percentage Calculator

How it's calculated

A% of B = A × B ÷ 100. A as a % of B = A ÷ B × 100. Percent change = (B − A) ÷ A × 100.

Three percentage questions, solved together

Percentages come up when you work out discounts, returns, brokerage and tax. This calculator answers the three most common questions from two numbers: what A% of B is, what percentage A is of B, and how much a value changed when it moved from A to B.

With the example values, 25% of 480 is 120, 25 is about 5.21% of 480, and a move from 25 to 480 is an increase of 1,820%. Change the two values to see all three results update together.

Frequently asked questions

How do I find a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 25% of 480 is 25 × 480 ÷ 100 = 120.

How do I calculate percentage change?

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

What is the difference between percentage and percentage points?

If a rate goes from 5% to 7%, it rose by 2 percentage points, which is a 40% increase in the rate itself.

How to use the Percentage Calculator

Enter value a, value b. The calculator updates as you type and shows 25% of 480, along with the figures behind it. It runs in your browser, so nothing you enter is sent anywhere. Use the Reset button to go back to the example values.