What is the Percentage Difference from 82 to 80?
From 82 to 80 is a 2.439% decrease
Step by step
- Difference: 80 − 82 = -2
- Divide by the starting value: -2 ÷ 82 = -0.02439
- Multiply by 100: -2.439%
How the answer is worked out
Percentage change measures a difference against the value you started with. The value went from 82 to 80, a difference of 2. Compared with the starting value of 82, that difference is 2.439%, so this is a 2.439% decrease.
The new value is 97.561% of the old one: for every 100 at the start there are now 97.561, so 2.439 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 $82 to $80 is a 2.439% discount.
- Weight: going from 82 to 80 kilograms is a loss of 2.439% of the starting weight.
- Results: if a team scores 80 points this season after 82 last season, its total has dropped by 2.439%.
A quicker way
Find 1% of the starting value: 82 ÷ 100 = 0.82. The difference of 2 is 2.439 of those steps.
Percentage change is not the same as percentage points. If a rate moves from 82% to 80%, it changes by 2 percentage points, but by 2.439% relative to where it started.
Check the answer
Work forwards from the start: 82 × (1 − 0.02439) = 82 × 0.97561 = 80. Getting 80 shows the answer is right.
Rounding
Rounded to a whole number the change is -2, to one decimal place -2.4 and to two decimal places -2.44. 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: 17 to 66
- Difference: 66 − 17 = 49
- Divide by the starting value: 49 ÷ 17 = 2.882353
- Multiply by 100: 288.2353%
Why the change back is different
A 2.439% fall followed by a 2.439% rise does not bring you back to 82: it gives 81.9512. The second percentage is taken of 80, not of 82, so to undo this change you need 2.5% 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 82 to 80
- What percent less is 80 than 82?
- 82 to 80 as a percent change
- How much did 82 fall going to 80, in percent?
- Relative change between 82 and 80
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 | -2.439% |
|---|---|
| Difference | -2 |
| New ÷ old | 0.97561 |
| Direction | decrease |
Related results
| 82 to 78 | From 82 to 78 is a 4.878% decrease |
| 82 to 79 | From 82 to 79 is a 3.6585% decrease |
| 82 to 81 | From 82 to 81 is a 1.2195% decrease |
| 82 to 90 | From 82 to 90 is a 9.7561% increase |
The other way round: Percentage difference from 80 to 82
Doing it in a spreadsheet
In Excel, Google Sheets or Numbers type =(80-82)/82*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
| 17 to 66 | Show answerFrom 17 to 66 is a 288.2353% increase |
| 56 to 12 | Show answerFrom 56 to 12 is a 78.5714% decrease |
| 85 to 94 | Show answerFrom 85 to 94 is a 10.5882% increase |
| 59 to 77 | Show answerFrom 59 to 77 is a 30.5085% increase |
| 94 to 65 | Show answerFrom 94 to 65 is a 30.8511% decrease |
| 30 to 61 | Show answerFrom 30 to 61 is a 103.3333% increase |
| 77 to 55 | Show answerFrom 77 to 55 is a 28.5714% decrease |
| 99 to 58 | Show answerFrom 99 to 58 is a 41.4141% decrease |
| 66 to 27 | Show answerFrom 66 to 27 is a 59.0909% decrease |
| 41 to 52 | Show answerFrom 41 to 52 is a 26.8293% increase |
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 82 to 80?
Going from 82 to 80 is a 2.439% decrease. Formula and steps.
Is going from 82 to 80 an increase or a decrease?
A decrease: the value fell by 2, which is 2.439% of the starting value.
What is the percentage change from 80 back to 82?
2.5%. It is a different number because the starting value is now 80, not 82.
What is the percentage difference between 82 and 80?
When neither value is the starting point, use the average as the base: 2 ÷ 81 × 100 = 2.4691%. 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 -2.439%.