How to use the Percentage Increase Calculator
Enter the original value and new value and the result appears straight away. Everything runs in your browser, so nothing you type is uploaded.
The formula
Percentage change = (new − old) ÷ |old| × 100.
Examples
- From 80 to 100
Absolute change: 20 Percentage change: 25%
- A drop from 200 to 150
Absolute change: -50 Percentage change: -25%
- Price rising from 45 to 52.50
Absolute change: 7.5 Percentage change: 16.67%
Limitations and assumptions
The original value cannot be zero. Negative values are allowed for change calculations.
Frequently asked questions
What is the percentage increase formula?
(new − old) ÷ old × 100.
Why is a 50% rise then a 50% fall not back to the start?
The second change applies to a bigger base. 100 up 50% is 150, and 150 down 50% is 75.
What if the old value is zero?
Percentage change from zero is undefined.
Is percentage change the same as percentage points?
No. Going from 40% to 45% is 5 percentage points but a 12.5% relative increase.