What is the Percentage Difference from 80 to 55?
From 80 to 55 is a 31.25% decrease
Step by step
- Difference: 55 − 80 = -25
- Divide by the starting value: -25 ÷ 80 = -0.3125
- Multiply by 100: -31.25%
How the answer is worked out
Percentage change measures a difference against the value you started with. The value went from 80 to 55, a difference of 25. Compared with the starting value of 80, that difference is 31.25%, so this is a 31.25% decrease.
The new value is 68.75% of the old one: for every 100 at the start there are now 68.75, so 31.25 out of every 100 have gone.
Why calculate this?
Percentage change compares a new value with an old one regardless of size: price rises, growth, discounts, score changes.
- Sales: a price cut from $80 to $55 is a 31.25% discount.
- Weight: going from 80 to 55 kilograms is a loss of 31.25% of the starting weight.
- Results: if a team scores 55 points this season after 80 last season, its total has dropped by 31.25%.
A quicker way
Find 1% of the starting value: 80 ÷ 100 = 0.8. The difference of 25 is 31.25 of those steps.
Percentage change is not the same as percentage points. If a rate moves from 80% to 55%, it changes by 25 percentage points, but by 31.25% relative to where it started.
Check the answer
Work forwards from the start: 80 × (1 − 0.3125) = 80 × 0.6875 = 55. Getting 55 shows the answer is right.
Rounding
Rounded to a whole number the change is -31, to one decimal place -31.3 and to two decimal places -31.25. Round only at the end: rounding halfway through a calculation can change the last digit.
The formula explained
percentage change = (new value − old value) ÷ old value × 100. A positive result is an increase and a negative result is a decrease. The old value is always the base, which is why the change from A to B and from B to A are different percentages.
Another worked example: 15 to 82
- Difference: 82 − 15 = 67
- Divide by the starting value: 67 ÷ 15 = 4.466667
- Multiply by 100: 446.6667%
Why the change back is different
A 31.25% fall followed by a 31.25% rise does not bring you back to 80: it gives 72.1875. The second percentage is taken of 55, not of 80, so to undo this change you need 45.4545% instead.
Other ways to ask this
The same calculation is often asked in other words. All of these have the answer above:
- Percentage decrease from 80 to 55
- What percent less is 55 than 80?
- 80 to 55 as a percent change
- How much did 80 fall going to 55, in percent?
- Relative change between 80 and 55
Terms used on this page
- Old value: the starting amount, used as the base of the percentage.
- New value: the amount after the change.
- Increase: a positive change: the new value is bigger.
- Percentage point: the plain difference between two rates, not a relative change.
The answer in other forms
| Change | -31.25% |
|---|---|
| Difference | -25 |
| New ÷ old | 0.6875 |
| Direction | decrease |
Related results
| 80 to 53 | From 80 to 53 is a 33.75% decrease |
| 80 to 54 | From 80 to 54 is a 32.5% decrease |
| 80 to 56 | From 80 to 56 is a 30% decrease |
| 80 to 57 | From 80 to 57 is a 28.75% decrease |
| 80 to 65 | From 80 to 65 is a 18.75% decrease |
The other way round: Percentage difference from 55 to 80
Doing it in a spreadsheet
In Excel, Google Sheets or Numbers type =(55-80)/80*100 into any cell. Replace the numbers with cell references (for example A1 and B1) to reuse the formula for a whole column.
Common mistakes
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%.
Practice examples
| 15 to 82 | Show answerFrom 15 to 82 is a 446.6667% increase |
| 37 to 34 | Show answerFrom 37 to 34 is a 8.1081% decrease |
| 71 to 63 | Show answerFrom 71 to 63 is a 11.2676% decrease |
| 24 to 15 | Show answerFrom 24 to 15 is a 37.5% decrease |
| 52 to 17 | Show answerFrom 52 to 17 is a 67.3077% decrease |
| 66 to 54 | Show answerFrom 66 to 54 is a 18.1818% decrease |
| 8 to 91 | Show answerFrom 8 to 91 is a 1,037.5% increase |
| 46 to 30 | Show answerFrom 46 to 30 is a 34.7826% decrease |
| 6 to 29 | Show answerFrom 6 to 29 is a 383.3333% increase |
| 55 to 34 | Show answerFrom 55 to 34 is a 38.1818% decrease |
How this answer was calculated
The result is worked out from the numbers in this page's address when the page is opened, using exact arithmetic wherever possible and rounding only for display. Nothing is copied from a printed table. If you think an answer is wrong, please tell us through the contact page and we will check it.
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Questions
What is the Percentage Difference from 80 to 55?
Going from 80 to 55 is a 31.25% decrease. Formula and steps.
Is going from 80 to 55 an increase or a decrease?
A decrease: the value fell by 25, which is 31.25% of the starting value.
What is the percentage change from 55 back to 80?
45.4545%. It is a different number because the starting value is now 55, not 80.
What is the percentage difference between 80 and 55?
When neither value is the starting point, use the average as the base: 25 ÷ 67.5 × 100 = 37.037%. That is the symmetric percentage difference.
How do I calculate percentage change in Excel or Google Sheets?
Put the old value in A1 and the new value in B1, then type =(B1-A1)/A1 and format the cell as a percentage. For these numbers it shows -31.25%.