Math
Percentage Change Calculator
Compare starting and ending values to find percentage change plus the absolute difference.
percent changeincreasedecrease
Percentage Change
Compare a starting value with an ending value to find the percent move and raw delta.
Percent change (%)
+25
Difference
+20
Ratio (end ÷ start)
1.25
Direction
Increase
Percent change formula
Percent change = ((end − start) / start) × 100
Positive results show gains, negative results show losses. A zero start value produces an undefined percent change.
How to use
- Enter the starting value.
- Enter the ending value you want to compare against the start.
- Review the percent change and the raw difference below the inputs.
Example
Input: Start = 80, End = 100
Output: Percent change = +25%, Difference = +20
FAQ & notes
What if the starting value is zero?
Percent change cannot be computed when the baseline is zero, so the calculator marks the result as undefined.
How do I interpret a negative result?
A negative percent change means the ending value is smaller than the starting value, indicating a decrease.