Percentage Increase Calculator
Compare an original value with a new value to find the percentage increase or decrease.
How percentage increase is calculated
Percentage change compares a new value with an original value. Subtract the original value from the new value, divide the difference by the original value, then multiply by 100. A positive answer means an increase; a negative answer means a decrease.
Formula
Percentage change = ((New value − Original value) ÷ Original value) × 100
For example, if a price rises from 80 to 100, the difference is 20 and the percentage increase is 25%. The calculation uses the original value as the baseline, not the new value.
When to use this tool
Use this calculator to compare prices, sales, website traffic, salaries, project costs, test scores or other numeric measurements. Make sure both values use the same unit and that the original value is not zero. When the original value is zero, percentage change is undefined because division by zero is not possible.
Related tools
Explore more practical calculators on our All Tools page or compare costs with the Unit Price Comparison Calculator.
