Percentage Increase / Decrease Calculator
Increase or decrease a value by a percentage.
Percentage Increase / Decrease
Increase or decrease a value by a percentage.
by%
Increase 100 by 20%
120
How it works
Enter the starting value, a percentage, and whether to increase or decrease by it.
The value is multiplied by (1 + percentage ÷ 100) to increase, or (1 − percentage ÷ 100) to decrease.
Formula
increase: result = value × (1 + percentage ÷ 100)
decrease: result = value × (1 − percentage ÷ 100)
Worked example: Increasing 200 by 15% gives 230