Sumwise

Percentage Difference between 20 and 40

Between 20 and 40: 66.6667% difference

Difference
66.6667%
Gap
20
Average
30
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: |20 − 40| = 20
  2. Average of the values: (20 + 40) ÷ 2 = 30
  3. Divide the gap by the average and multiply by 100: 20 ÷ 30 × 100 = 66.6667%
  4. Check: Work backwards: 0.666667 × 30 = 20, the gap between the values.

In a spreadsheet: =ABS(20-40)/((20+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 20 more than 20. Measured against their average, 30, that gap is 66.6667%. The result is the same whichever value you name first.

Prices: if one shop charges $20 and another $40 for the same item, the prices differ by 66.6667%.

Why the average is the base

Dividing the gap of 20 by 20 gives 100%, and dividing it by 40 gives 50%. The average, 30, sits between them, so the result does not depend on which value is listed first.

Related results

Results for nearby numbers
20 and 50

Between 20 and 50: 85.7143% difference

20 and 30

Between 20 and 30: 40% difference

30 and 40

Between 30 and 40: 28.5714% difference

10 and 40

Between 10 and 40: 120% difference

The other way round: Percentage change from 20 to 40. Percentage difference is symmetric: between 40 and 20 it is the same 66.6667%, so there is one page for each pair of numbers. Percentage change is not: from 20 to 40 is +100%, from 40 to 20 is -50%.

Practice

4 and 28
Show answer

Between 4 and 28: 150% difference

35 and 38
Show answer

Between 35 and 38: 8.2192% difference

17 and 84
Show answer

Between 17 and 84: 132.6733% difference

42 and 96
Show answer

Between 42 and 96: 78.2609% difference

19 and 23
Show answer

Between 19 and 23: 19.0476% difference

54 and 62
Show answer

Between 54 and 62: 13.7931% difference

Calculate another

How answers are calculated and checked: methodology.

Questions

Percentage Difference between 20 and 40

The percentage difference between 20 and 40 is 66.6667%: the gap divided by the average. Formula and steps.

What is the percentage change from 20 to 40?

+100%. Percentage change uses the starting value (20) 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.