Sumwise

Percentage Change from 21 to 28

From 21 to 28 is a 33.3333% increase

Change
33.3333%
Difference
7
New ÷ old
1.333333
Direction
increase

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. Difference: 28 − 21 = 7
  2. Divide by the starting value: 7 ÷ 21 = 0.333333
  3. Multiply by 100: 33.3333%
  4. Check: Work forwards from the start: 21 × (1 + 0.333333) = 21 × 1.333333 = 28.

In a spreadsheet: =(28-21)/21*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 1.3333 times the old one: for every 100 at the start there are now 133.3333.

Prices: an item whose price rises from $21 to $28 has gone up by 33.3333%.

Why the change back is different

A 33.3333% rise followed by a 33.3333% fall does not bring you back to 21: it gives 18.6667. The second percentage is taken of 28, not of 21, so to undo this change you need 25% instead.

Related results

Results for nearby numbers
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From 21 to 26 is a 23.8095% increase

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From 21 to 30 is a 42.8571% increase

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The other way round: Percentage change from 28 to 21. Percentage change is not symmetric: from 21 to 28 is 33.3333%, but from 28 back to 21 is -25%, because the starting value is the base. For a comparison that is the same both ways, use the percentage difference between 21 and 28: 28.5714%. See Percentage difference between 21 and 28.

Practice

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From 5 to 54 is a 980% increase

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From 71 to 5 is a 92.9577% decrease

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From 91 to 61 is a 32.967% decrease

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From 58 to 42 is a 27.5862% decrease

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From 7 to 37 is a 428.5714% increase

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From 73 to 15 is a 79.4521% decrease

Calculate another

How answers are calculated and checked: methodology.

Questions

Percentage Change from 21 to 28

Going from 21 to 28 is a 33.3333% increase. Formula and steps.

Is going from 21 to 28 an increase or a decrease?

An increase: the value grew by 7, which is 33.3333% of the starting value.

What is the percentage change from 28 back to 21?

-25%. It is a different number because the starting value is now 28, not 21.