Overview
When a value changes several times, the percentages do not simply add. A 10% increase followed by another 10% is not a 20% increase but 21%, because the second percentage applies to the new value. This calculator follows the entire sequence.
Formula
Final value = starting value × (1 + p1) × (1 + p2) × ...
How it works
Enter the starting value
The value before any change.
Enter the percentages
Separate them with commas, using negative values for decreases.
Read the result
The final value, total change and sequence of values appear.
Worked examples
Example 1: 100, then +10%, then +10%
100 → 110 → 121, for a total change of 21%.
Example 2: 100, then +20%, then −10%
100 → 120 → 108, for a total change of 8%.
Frequently asked questions
Why aren't the percentages added?
Because each percentage applies to a different value after the previous change.
Can I use negative percentages?
Yes. A negative value means a decrease.
What happens if one change is −100%?
The value becomes zero and remains zero after any later change.
This calculator is for educational and informational purposes only and is not a substitute for professional advice.