What is 40% of 30?

To find 40% of 30, multiply 30 by 40 and divide by 100. 30 × 40 ÷ 100 = 12.

Need a different percentage? Use the free percentage calculator.

Another way to look at it

Turn it around: 30% of 40 is also 12. 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 40% of 30 compares to nearby round percentages.

Quick example

A 40% discount on a £30 item saves you £12.

Other percentages of 30

Frequently asked questions

Is 40% of 30 more or less than half?

12 is less than half of 30 — half of 30 is 15.

What's the difference between 40% of 30 and 40% off 30?

40% of 30 is the portion itself: 12. 40% off 30 means removing that portion from the total, leaving 18. The two figures add back up to 30.

How do I work out 40% of 30 without a calculator?

Multiply 30 by 40 and divide by 100. A quick shortcut: find 10% of 30 first (3), then scale that up or down to build 40%.