Percent Increase / Decrease Calculator
See by what percent a price, sale, salary or number went up or down. Enter the old and new values to get the change instantly.
Quick answer
800 to 1,000 = 25 % increase.
How it is calculated
- Find the difference: new − old = 1,000 − 800 = 200.
- Divide by the old value: 200 ÷ 800 = 0.25.
- Multiply by 100: 25%. A negative result means a decrease.
Worked example
Sales were ₹800 last month and ₹1,000 this month. The difference is 200, an increase of 25 %.
| Old value | 800 |
| New value | 1,000 |
| Change | 25 % |
| Difference | 200 |
Formula
Change = (B-A)/A×100 Difference = B-A
Good to know
- Percent change is always worked on the old value, not the new one.
- Going up 25% and then down 25% does not bring you back to the start.
Questions people ask
What is the percent increase formula?
(new − old) ÷ old × 100.
How do I see a decrease?
If the new value is smaller, the result is negative, e.g. −20% means 20% lower.
How do I work out a salary hike?
Enter the old and new salary to get the hike in percent.
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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0