Compound Percentage Calculator
Combine multiple percentage increases and decreases and calculate the overall net change.
What is Compound Percentage Calculator?
Combine multiple percentage increases and decreases correctly. Successive percentage changes compound, so they should not usually be added together.
Compound percentage formula
Start with an initial value and multiply by each change factor: final = start × (1 + p₁/100) × (1 + p₂/100) × ….
Why +10% and -10% do not cancel
Starting from 100, a 10% increase gives 110. A 10% decrease from 110 gives 99, so the overall result is a 1% decrease.
Use multiple changes
Add successive increases or decreases to model price changes, growth, discounts, markups or repeated adjustments. Enter decreases as negative percentages.
Overall percentage change
The calculator compares the final value with the starting value and reports the combined net percentage change.
Frequently Asked Questions
How do I combine multiple percentage changes?
Multiply the change factors rather than adding the percentages.
Do a 10% increase and 10% decrease cancel out?
No. Applied successively, they produce an overall 1% decrease.
Can I use negative percentages?
Yes. Enter decreases as negative values such as -12.5.