Sumwise

What is the Percentage Difference from 34 to 17?

From 34 to 17 is a 50% decrease

Change
-50%
Difference
-17
New ÷ old
0.5
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: 17 − 34 = -17
  2. Divide by the starting value: -17 ÷ 34 = -0.5
  3. Multiply by 100: -50%
  4. Check: Work forwards from the start: 34 × (1 − 0.5) = 34 × 0.5 = 17.

In a spreadsheet: =(17-34)/34*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 50% of the old one: for every 100 at the start there are now 50, so 50 out of every 100 have gone.

Sales: a price cut from $34 to $17 is a 50% discount.

Why the change back is different

A 50% fall followed by a 50% rise does not bring you back to 34: it gives 25.5. The second percentage is taken of 17, not of 34, so to undo this change you need 100% instead.

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The other way round: Percentage difference from 17 to 34

Practice

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From 7 to 62 is a 785.7143% increase

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From 51 to 98 is a 92.1569% increase

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From 79 to 32 is a 59.4937% decrease

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From 95 to 90 is a 5.2632% decrease

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From 74 to 43 is a 41.8919% decrease

Calculate another

How answers are calculated and checked: methodology.

Questions

What is the Percentage Difference from 34 to 17?

Going from 34 to 17 is a 50% decrease. Formula and steps.

Is going from 34 to 17 an increase or a decrease?

A decrease: the value fell by 17, which is 50% of the starting value.

What is the percentage change from 17 back to 34?

100%. It is a different number because the starting value is now 17, not 34.