Advanced Percentage Calculator
Multiple live tools for reverse percentages, multi-period changes, successive applications, and backing into original values.
What is X% of Y?
36
Y is X% of what?
240
The original base amount
Percentage change
Change
+25%
Multi-period / compound percentage change
Enter comma-separated rates for each period. Last rate repeats if fewer provided.
Ending value
1,161.22
Total change over 3 periods
+16.12%
Apply successive percentage changes
- After first change
- 240
- After second change
- 216
- After third change
- 226.8
Note: successive % changes are multiplicative, not additive.
What was the original before a % change?
Original value
100
Example: after a 25% increase you have 125 → original was 100.