Sumwise

What is the Percentage Difference from 27 to 18?

From 27 to 18 is a 33.3333% decrease

Change
-33.3333%
Difference
-9
New ÷ old
0.666667
Direction
decrease

Sumwise · Checked by Theo Abbott · Data: exact arithmetic; unit definitions from NIST SP 811 · Updated · How we check it

How to work it out

  1. Difference: 18 − 27 = -9
  2. Divide by the starting value: -9 ÷ 27 = -0.333333
  3. Multiply by 100: -33.3333%
  4. Check: Work forwards from the start: 27 × (1 − 0.333333) = 27 × 0.666667 = 18.

In a spreadsheet: =(18-27)/27*100. Always divide by the starting value, not the new one. A rise from 40 to 50 is +25%, but the fall from 50 back to 40 is −20%.

What the result means

The new value is 66.6667% of the old one: for every 100 at the start there are now 66.6667, so 33.3333 out of every 100 have gone.

Sales: a price cut from $27 to $18 is a 33.3333% discount.

Why the change back is different

A 33.3333% fall followed by a 33.3333% rise does not bring you back to 27: it gives 24. The second percentage is taken of 18, not of 27, so to undo this change you need 50% instead.

Related results

Results for nearby numbers
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From 27 to 16 is a 40.7407% decrease

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From 27 to 17 is a 37.037% decrease

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From 27 to 19 is a 29.6296% decrease

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From 27 to 20 is a 25.9259% decrease

27 to 28

From 27 to 28 is a 3.7037% increase

The other way round: Percentage difference from 18 to 27

Practice

6 to 28
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From 6 to 28 is a 366.6667% increase

41 to 11
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From 41 to 11 is a 73.1707% decrease

7 to 72
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From 7 to 72 is a 928.5714% increase

19 to 82
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From 19 to 82 is a 331.5789% increase

60 to 92
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From 60 to 92 is a 53.3333% increase

78 to 21
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From 78 to 21 is a 73.0769% decrease

Calculate another

How answers are calculated and checked: methodology.

Questions

What is the Percentage Difference from 27 to 18?

Going from 27 to 18 is a 33.3333% decrease. Formula and steps.

Is going from 27 to 18 an increase or a decrease?

A decrease: the value fell by 9, which is 33.3333% of the starting value.

What is the percentage change from 18 back to 27?

50%. It is a different number because the starting value is now 18, not 27.