Sumwise

Percentage Difference between 30 and 40

Between 30 and 40: 28.5714% difference

Difference
28.5714%
Gap
10
Average
35
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: |30 − 40| = 10
  2. Average of the values: (30 + 40) ÷ 2 = 35
  3. Divide the gap by the average and multiply by 100: 10 ÷ 35 × 100 = 28.5714%
  4. Check: Work backwards: 0.285714 × 35 = 10, the gap between the values.

In a spreadsheet: =ABS(30-40)/((30+40)/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

40 is 10 more than 30. Measured against their average, 35, that gap is 28.5714%. The result is the same whichever value you name first.

Prices: if one shop charges $30 and another $40 for the same item, the prices differ by 28.5714%.

Why the average is the base

Dividing the gap of 10 by 30 gives 33.3333%, and dividing it by 40 gives 25%. The average, 35, sits between them, so the result does not depend on which value is listed first.

Related results

Results for nearby numbers
30 and 50

Between 30 and 50: 50% difference

20 and 40

Between 20 and 40: 66.6667% difference

The other way round: Percentage change from 30 to 40. Percentage difference is symmetric: between 40 and 30 it is the same 28.5714%, so there is one page for each pair of numbers. Percentage change is not: from 30 to 40 is +33.3333%, from 40 to 30 is -25%.

Practice

6 and 22
Show answer

Between 6 and 22: 114.2857% difference

18 and 67
Show answer

Between 18 and 67: 115.2941% difference

15 and 65
Show answer

Between 15 and 65: 125% difference

42 and 62
Show answer

Between 42 and 62: 38.4615% difference

40 and 96
Show answer

Between 40 and 96: 82.3529% difference

15 and 57
Show answer

Between 15 and 57: 116.6667% difference

Calculate another

How answers are calculated and checked: methodology.

Questions

Percentage Difference between 30 and 40

The percentage difference between 30 and 40 is 28.5714%: the gap divided by the average. Formula and steps.

What is the percentage change from 30 to 40?

+33.3333%. Percentage change uses the starting value (30) 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.