What is 15% of 30?

To find 15% of 30, multiply 30 by 15 and divide by 100. 30 × 15 ÷ 100 = 4.5.

Need a different percentage? Use the free percentage calculator.

Another way to look at it

Turn it around: 30% of 15 is also 4.5. 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 15% of 30 compares to nearby round percentages.

Quick example

If a £30 restaurant bill had a 15% tip added, the tip would be £4.5.

Other percentages of 30

Frequently asked questions

Is 15% of 30 more or less than half?

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

What's the difference between 15% of 30 and 15% off 30?

15% of 30 is the portion itself: 4.5. 15% off 30 means removing that portion from the total, leaving 25.5. The two figures add back up to 30.

How do I work out 15% of 30 without a calculator?

Multiply 30 by 15 and divide by 100. A quick shortcut: find 10% of 30 first (3), then scale that up or down to build 15%.