Sumwise

What is 10 Percent of 18?

10% of 18 = 1.8

Result
1.8
Remaining
16.2
10% as decimal
0.1
18 + 10%
19.8

Sumwise · Maintained by Theo Abbott (pen name) · automated checks · Data: exact arithmetic; unit definitions from NIST SP 811 · Updated · How the checks work

How to work it out

  1. Turn the percentage into a decimal: 10 ÷ 100 = 0.1
  2. Multiply: 0.1 × 18 = 1.8
  3. Check: Work backwards: 1.8 ÷ 18 × 100 = 10%.

Another method. As a proportion of part to whole: 10/100 = part/18, so part = 10 × 18 ÷ 100 = 1.8. Both methods always give the same answer.

In a spreadsheet: =10%*18. Forgetting to divide the percentage by 100 makes the answer 100 times too big. Note that x% of y always equals y% of x.

What the result means

1.8 is the 10% share of 18. The remaining 90% is 16.2, and the two parts add back up to 18.

Discounts: 10% off an item priced $18 saves $1.8, so you pay $16.2.

Adding and taking away 10%

Increasing 18 by 10% gives 19.8 and decreasing it by 10% gives 16.2. These do not cancel out: raising 18 by 10% and then lowering the result by 10% ends at 17.82, because the second 10% is taken of a bigger number.

Related results

Results for nearby numbers
5% of 18

5% of 18 = 0.9

15% of 18

15% of 18 = 2.7

20% of 18

20% of 18 = 3.6

25% of 18

25% of 18 = 4.5

50% of 18

50% of 18 = 9

75% of 18

75% of 18 = 13.5

The other way round: 18% of 10. 10% of 18 and 18% of 10 are always equal (both are 10 × 18 ÷ 100 = 1.8), so you can swap the numbers when one order is easier to work out in your head.

Practice

2% of 18
Show answer

2% of 18 = 0.36

28% of 76
Show answer

28% of 76 = 21.28

6% of 79
Show answer

6% of 79 = 4.74

15% of 44
Show answer

15% of 44 = 6.6

33% of 95
Show answer

33% of 95 = 31.35

81% of 32
Show answer

81% of 32 = 25.92

Calculate another

How answers are calculated and checked: methodology.

Questions

What is 10 Percent of 18?

10% of 18 is 1.8. Formula, steps and practice examples.

What is 10% off 18?

16.2. Taking 10% off leaves 90% of 18.

What is 18 plus 10%?

19.8. Adding 10% is the same as multiplying by 1.1.