Percent of a number calculator

Understand the calculation

How to find a percentage of a number

Divide the percentage by 100 to turn it into a decimal, then multiply it by the number. For 15% of 60, that’s 15 ÷ 100 = 0.15, and 0.15 × 60 = 9.

The order of the multiplication doesn’t matter, which gives you a useful shortcut: 8% of 50 is the same as 50% of 8, which is 4. When one of the two numbers is easier to work with as a percentage, swap them.

Working backward to the total

If you know that 18 is 40% of something, divide 18 by 0.4 to get 45. Check it by going forward again: 40% of 45 is 18. Use this when a receipt shows a deposit and its percentage, or a progress bar shows how much is done and what share that is.

This is a different problem from undoing a percentage change. If a price rose by 40% to reach 18, the original was 18 ÷ 1.4 ≈ 12.86, not 45. The reverse percentage calculator handles that case.

Percentages above 100 and below 1

Nothing stops the percentage from going over 100: 120% of 85 is 102, more than you started with. Very small percentages work the same way. 0.25% of 4,000 is 10. If you work with basis points, 1 basis point is 0.01%, so 25 basis points of 4,000 is also 0.25% of 4,000.