What is 10% of 400?

To find 10% of 400, multiply 400 by 10 and divide by 100. 400 × 10 ÷ 100 = 40.

Need a different percentage? Use the free percentage calculator.

Another way to look at it

Turn it around: 400% of 10 is also 40. That's not a coincidence — percentages work both ways, so swapping the two numbers always gives you the same answer.

Nearby round percentages

For context, here is how 10% of 400 compares to nearby round percentages.

Quick example

A 10% pay rise on a £400 salary adds £40 extra each year.

Other percentages of 400

Frequently asked questions

Is 10% of 400 more or less than half?

40 is less than half of 400 — half of 400 is 200.

What's the difference between 10% of 400 and 10% off 400?

10% of 400 is the portion itself: 40. 10% off 400 means removing that portion from the total, leaving 360. The two figures add back up to 400.

How do I work out 10% of 400 without a calculator?

Multiply 400 by 10 and divide by 100. A quick shortcut: find 10% of 400 first (40), then scale that up or down to build 10%.