Sumwise

Percentage Difference between 15 and 30

Between 15 and 30: 66.6667% difference

Difference
66.6667%
Gap
15
Average
22.5
Ratio
2 : 1

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. Gap between the values: |15 − 30| = 15
  2. Average of the values: (15 + 30) ÷ 2 = 22.5
  3. Divide the gap by the average and multiply by 100: 15 ÷ 22.5 × 100 = 66.6667%
  4. Check: Work backwards: 0.666667 × 22.5 = 15, the gap between the values.

In a spreadsheet: =ABS(15-30)/((15+30)/2)*100. Dividing by one of the values instead of their average turns it into a percentage change, which depends on which value you start from.

What the result means

30 is 15 more than 15. Measured against their average, 22.5, that gap is 66.6667%. The result is the same whichever value you name first.

Prices: if one shop charges $15 and another $30 for the same item, the prices differ by 66.6667%.

Why the average is the base

Dividing the gap of 15 by 15 gives 100%, and dividing it by 30 gives 50%. The average, 22.5, sits between them, so the result does not depend on which value is listed first.

Related results

Results for nearby numbers
15 and 40

Between 15 and 40: 90.9091% difference

15 and 20

Between 15 and 20: 28.5714% difference

25 and 30

Between 25 and 30: 18.1818% difference

5 and 30

Between 5 and 30: 142.8571% difference

The other way round: Percentage change from 15 to 30. Percentage difference is symmetric: between 30 and 15 it is the same 66.6667%, so there is one page for each pair of numbers. Percentage change is not: from 15 to 30 is +100%, from 30 to 15 is -50%.

Practice

3 and 70
Show answer

Between 3 and 70: 183.5616% difference

24 and 35
Show answer

Between 24 and 35: 37.2881% difference

40 and 99
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Between 40 and 99: 84.8921% difference

51 and 67
Show answer

Between 51 and 67: 27.1186% difference

23 and 34
Show answer

Between 23 and 34: 38.5965% difference

7 and 62
Show answer

Between 7 and 62: 159.4203% difference

Calculate another

How answers are calculated and checked: methodology.

Questions

Percentage Difference between 15 and 30

The percentage difference between 15 and 30 is 66.6667%: the gap divided by the average. Formula and steps.

What is the percentage change from 15 to 30?

+100%. Percentage change uses the starting value (15) as the base, so it is larger than the percentage difference of 66.6667%.

What is the difference between percentage difference and percentage change?

Percentage change compares a new value with an old one and divides by the old value. Percentage difference compares two values on an equal footing and divides by their average, so the order does not matter.