How the increase is worked out
Percentage change = ((New − Original) ÷ Original) × 100
- Subtract the original number from the new number.
- Divide that difference by the original number.
- Multiply by 100 to turn it into a percentage.
- A negative result means the value went down.
Worked example — From 240 to 300: 300 − 240 = 60. Then 60 ÷ 240 = 0.25, and 0.25 × 100 = a 25% increase.
Common percentage changes
| Change | Multiply the original by | Read it as |
|---|---|---|
| +10% | ×1.10 | One tenth more |
| +25% | ×1.25 | A quarter more |
| +50% | ×1.50 | Half again as much |
| +100% | ×2.00 | Twice as much |
| −10% | ×0.90 | One tenth less |
| −25% | ×0.75 | A quarter less |
| −50% | ×0.50 | Half as much |
Swipe the table sideways to see the rest.
A change is always measured against where you started.
Worked examples
| Original | New | Percentage change | Absolute change |
|---|---|---|---|
| 240 | 300 | +25% | +60 |
| 1,100 | 1,250 | +13.64% | +150 |
| 80 | 64 | -20% | -16 |
| 15,000 | 17,250 | +15% | +2,250 |
Swipe the table sideways to see the rest.
Every row is calculated by this page, not typed in by hand.
Things to consider
- A rise and the same-sized fall do not cancel out: 100 → 110 → 99.
- Percent change is always measured against the starting number.
- Doubling is +100%; tripling is +200%.
Frequently asked questions
What if the value went down?
The result is negative — that is the percentage decrease.
Can the increase be more than 100%?
Yes. Going from 50 to 150 is a 200% increase.
Why is a rise from 10 to 15 not the same as 100 to 105?
Both add 5, but the base differs: 5 of 10 is 50%, 5 of 100 is 5%.
How do I reverse a percentage increase?
Divide the new value by (1 + the percentage ÷ 100).
Results are estimates for general information only, not financial, medical or professional advice.