Sumwise

What is 20 Percent of 18?

20% of 18 = 3.6

Result
3.6
Remaining
14.4
20% as decimal
0.2
18 + 20%
21.6

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: 20 ÷ 100 = 0.2
  2. Multiply: 0.2 × 18 = 3.6
  3. Check: Work backwards: 3.6 ÷ 18 × 100 = 20%.

Another method. As a proportion of part to whole: 20/100 = part/18, so part = 20 × 18 ÷ 100 = 3.6. Both methods always give the same answer.

In a spreadsheet: =20%*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

3.6 is the 20% share of 18. The remaining 80% is 14.4, and the two parts add back up to 18.

Discounts: 20% off an item priced $18 saves $3.6, so you pay $14.4.

Adding and taking away 20%

Increasing 18 by 20% gives 21.6 and decreasing it by 20% gives 14.4. These do not cancel out: raising 18 by 20% and then lowering the result by 20% ends at 17.28, because the second 20% is taken of a bigger number.

Related results

Results for nearby numbers
5% of 18

5% of 18 = 0.9

10% of 18

10% of 18 = 1.8

15% of 18

15% of 18 = 2.7

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 20. 20% of 18 and 18% of 20 are always equal (both are 20 × 18 ÷ 100 = 3.6), so you can swap the numbers when one order is easier to work out in your head.

Practice

4% of 92
Show answer

4% of 92 = 3.68

11% of 76
Show answer

11% of 76 = 8.36

20% of 8
Show answer

20% of 8 = 1.6

44% of 27
Show answer

44% of 27 = 11.88

1% of 54
Show answer

1% of 54 = 0.54

62% of 61
Show answer

62% of 61 = 37.82

Calculate another

How answers are calculated and checked: methodology.

Questions

What is 20 Percent of 18?

20% of 18 is 3.6. Formula, steps and practice examples.

What is 20% off 18?

14.4. Taking 20% off leaves 80% of 18.

What is 18 plus 20%?

21.6. Adding 20% is the same as multiplying by 1.2.