Percentage change calculator
Calculate percentage change between two values. Shows increase or decrease as a percentage with optional multi-period compounding.
- Free, no sign-up
- No data stored
- Reviewed 2026-01-15
Your details
Results
Increase of
20.83 %
1,200 → 1,450
- Absolute change
- 250
- Change percent
- 20.83 %
- Multiplier
- 1.2083×
- Reverse change
- -17.24 %
Reverse note
About the Percentage Change Calculator
Enter a starting value and an ending value to see the percentage change. The calculator handles both increases and decreases, and can compute the average per-period change if multiple periods are involved.
How to use the Percentage Change Calculator
- Enter the original (starting) value.
- Enter the new (ending) value.
- Optionally enter the number of periods.
- View total % change and per-period average.
Formula and method
% Change = (New − Old) / |Old| × 100
Frequently asked questions
How is percentage change calculated?
(New − Old) / Old × 100. A positive result is an increase; negative is a decrease.
What if the original value is zero?
Percentage change from zero is mathematically undefined. The calculator will flag this as an error.
What is the per-period change?
If change happened over N periods, per-period = (End/Start)^(1/N) − 1. This is the compound average growth rate (CAGR).