Increasing by a percentage multiplies the original by one plus that percentage. A 20% increase multiplies by 1.2.
How to use the Percentage Increase Calculator
- Original value
- Increase
- Want to work backwards? Type a value into New value and Increase is calculated for you.
Results update as you type, and every field accepts the units shown in its menu.
How it works
Multiply the starting value by one plus the percentage written as a decimal. Type a new value into the result to find the percentage instead.
Inputs explained
| Field | What to enter |
|---|---|
| Original value | A number |
| Increase | In % |
What each result means
- New value = [Original value] × (1 + [Increase]÷100)
- Amount added = [New value] – [Original value]
Example values
How the main result changes when Increase changes and everything else stays at the example values above:
| Increase (%) | New value |
|---|---|
| 10 | 275 |
| 15 | 287.5 |
| 20 | 300 |
| 25 | 312.5 |
| 30 | 325 |
| 40 | 350 |
Formula
New value = original × (1 + increase ÷ 100)Worked example
Inputs — Original value: 250; Increase: 20 %.
Results — New value = 300; Amount added = 50.
Key terms
- Multiplier
- The factor 1 + p/100 applied to the original value.
Frequently asked questions
How do I reverse a percentage increase?
Divide the new value by (1 + p/100). Subtracting the same percentage does not work.
Is a 50% increase then a 50% decrease back to the start?
No, it ends 25% lower.
What formula does the Percentage Increase Calculator use?
New value = original × (1 + increase ÷ 100).
Can I work backwards from the result?
Yes. Type the result you want into New value and the calculator finds the matching increase.