Sumwise

What is the Percentage Difference from 7 to 21?

From 7 to 21 is a 200% increase

Change
200%
Difference
14
New ÷ old
3
Direction
increase

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: 21 − 7 = 14
  2. Divide by the starting value: 14 ÷ 7 = 2
  3. Multiply by 100: 200%
  4. Check: Work forwards from the start: 7 × (1 + 2) = 7 × 3 = 21.

In a spreadsheet: =(21-7)/7*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 3 times the old one: for every 100 at the start there are now 300. The value has more than doubled.

Prices: an item whose price rises from $7 to $21 has gone up by 200%.

Why the change back is different

A 200% rise followed by a 200% fall does not bring you back to 7: it gives -21. The second percentage is taken of 21, not of 7, so to undo this change you need 66.6667% instead.

Related results

Results for nearby numbers
7 to 19

From 7 to 19 is a 171.4286% increase

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From 7 to 20 is a 185.7143% increase

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From 7 to 22 is a 214.2857% increase

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From 7 to 23 is a 228.5714% increase

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From 7 to 31 is a 342.8571% increase

The other way round: Percentage difference from 21 to 7

Practice

2 to 75
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From 2 to 75 is a 3,650% increase

7 to 36
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From 7 to 36 is a 414.2857% increase

87 to 65
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From 87 to 65 is a 25.2874% decrease

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From 85 to 81 is a 4.7059% decrease

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From 32 to 34 is a 6.25% increase

20 to 57
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From 20 to 57 is a 185% increase

Calculate another

How answers are calculated and checked: methodology.

Questions

What is the Percentage Difference from 7 to 21?

Going from 7 to 21 is a 200% increase. Formula and steps.

Is going from 7 to 21 an increase or a decrease?

An increase: the value grew by 14, which is 200% of the starting value.

What is the percentage change from 21 back to 7?

-66.6667%. It is a different number because the starting value is now 21, not 7.