How to use the percentage increase calculator
- Enter the original value. The page starts with 800.
- Enter the new value. The page starts with 1,000.
- Read the percentage change, with the formula and the difference below it.
About this scenario
People search for percentage increase when they compare prices, salaries, rent, follower counts or sales across two periods. You need the old value, the new value and a single formula.
Worked example
The page opens with an old value of 800 and a new value of 1,000. The difference is 200, and dividing by the original gives 25 percent. In other words, 1,000 is 25 percent more than 800.
The table shows what a few common percentage increases do to 800.
| Increase | New value | Difference |
|---|---|---|
| 5% | 840 | 40 |
| 10% | 880 | 80 |
| 15% | 920 | 120 |
| 25% | 1,000 | 200 |
| 50% | 1,200 | 400 |
| 100% | 1,600 | 800 |
What to notice
Percent changes are not symmetric. An increase from 800 to 1,000 is 25 percent, but falling from 1,000 back to 800 is only 20 percent, because the second change starts from a larger base. That is why a 50 percent rise needs a 33.3 percent fall to undo it.
Tips
- The formula is (new − old) ÷ old × 100. Always divide by the original, not the new value.
- A rise of more than 100 percent means the new value is more than double the old one.
- To work out a value after a known increase, use the percentage calculator and read the “plus” row.
- See also: percentage decrease calculator, percentage calculator, discount calculator for shopping, gst calculator 18 percent.
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