Sumwise

Percentage Difference between 21 and 28

Between 21 and 28: 28.5714% difference

Difference
28.5714%
Gap
7
Average
24.5
Ratio
1.3333 : 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: |21 − 28| = 7
  2. Average of the values: (21 + 28) ÷ 2 = 24.5
  3. Divide the gap by the average and multiply by 100: 7 ÷ 24.5 × 100 = 28.5714%
  4. Check: Work backwards: 0.285714 × 24.5 = 7, the gap between the values.

In a spreadsheet: =ABS(21-28)/((21+28)/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

28 is 7 more than 21. Measured against their average, 24.5, that gap is 28.5714%. The result is the same whichever value you name first.

Prices: if one shop charges $21 and another $28 for the same item, the prices differ by 28.5714%.

Why the average is the base

Dividing the gap of 7 by 21 gives 33.3333%, and dividing it by 28 gives 25%. The average, 24.5, sits between them, so the result does not depend on which value is listed first.

Related results

Results for nearby numbers
21 and 38

Between 21 and 38: 57.6271% difference

11 and 28

Between 11 and 28: 87.1795% difference

The other way round: Percentage change from 21 to 28. Percentage difference is symmetric: between 28 and 21 it is the same 28.5714%, so there is one page for each pair of numbers. Percentage change is not: from 21 to 28 is +33.3333%, from 28 to 21 is -25%.

Practice

5 and 54
Show answer

Between 5 and 54: 166.1017% difference

5 and 71
Show answer

Between 5 and 71: 173.6842% difference

61 and 91
Show answer

Between 61 and 91: 39.4737% difference

42 and 58
Show answer

Between 42 and 58: 32% difference

7 and 37
Show answer

Between 7 and 37: 136.3636% difference

15 and 73
Show answer

Between 15 and 73: 131.8182% difference

Calculate another

How answers are calculated and checked: methodology.

Questions

Percentage Difference between 21 and 28

The percentage difference between 21 and 28 is 28.5714%: the gap divided by the average. Formula and steps.

What is the percentage change from 21 to 28?

+33.3333%. Percentage change uses the starting value (21) as the base, so it is larger than the percentage difference of 28.5714%.

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.