How it works
The original value is multiplied by 1 plus the percentage expressed as a decimal, so a 25% increase multiplies by 1.25.
Formula: New value = original × (1 + percentage ÷ 100)
Examples
A price increase
80 increased by 25% is 80 × 1.25 = 100.
A small increase
200 increased by 10% is 200 × 1.10 = 220.
Things to keep in mind
- This calculator finds the value after an increase. To go the other way — working out what a value was before a known increase — use the reverse-percentage mode on the main Percentage Calculator instead.
- A negative percentage is not rejected: it produces the same result the Percentage Decrease Calculator would for the equivalent positive percentage, since increasing by −10% and decreasing by 10% are the same calculation.