Sumwise

Percentage Difference between 30 and 70

Between 30 and 70: 80% difference

Difference
80%
Gap
40
Average
50
Ratio
2.3333 : 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 − 70| = 40
  2. Average of the values: (30 + 70) ÷ 2 = 50
  3. Divide the gap by the average and multiply by 100: 40 ÷ 50 × 100 = 80%
  4. Check: Work backwards: 0.8 × 50 = 40, the gap between the values.

In a spreadsheet: =ABS(30-70)/((30+70)/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

70 is 40 more than 30. Measured against their average, 50, that gap is 80%. The result is the same whichever value you name first.

Prices: if one shop charges $30 and another $70 for the same item, the prices differ by 80%.

Why the average is the base

Dividing the gap of 40 by 30 gives 133.3333%, and dividing it by 70 gives 57.1429%. The average, 50, sits between them, so the result does not depend on which value is listed first.

Related results

Results for nearby numbers
30 and 80

Between 30 and 80: 90.9091% difference

30 and 60

Between 30 and 60: 66.6667% difference

40 and 70

Between 40 and 70: 54.5455% difference

20 and 70

Between 20 and 70: 111.1111% difference

The other way round: Percentage change from 30 to 70. Percentage difference is symmetric: between 70 and 30 it is the same 80%, so there is one page for each pair of numbers. Percentage change is not: from 30 to 70 is +133.3333%, from 70 to 30 is -57.1429%.

Practice

7 and 75
Show answer

Between 7 and 75: 165.8537% difference

9 and 49
Show answer

Between 9 and 49: 137.931% difference

18 and 31
Show answer

Between 18 and 31: 53.0612% difference

17 and 72
Show answer

Between 17 and 72: 123.5955% difference

12 and 73
Show answer

Between 12 and 73: 143.5294% difference

29 and 54
Show answer

Between 29 and 54: 60.241% difference

Calculate another

How answers are calculated and checked: methodology.

Questions

Percentage Difference between 30 and 70

The percentage difference between 30 and 70 is 80%: the gap divided by the average. Formula and steps.

What is the percentage change from 30 to 70?

+133.3333%. Percentage change uses the starting value (30) as the base, so it is larger than the percentage difference of 80%.

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.