About this calculator
The calculator also shows the percentage difference, which compares two values without treating either as the starting point.
How to use it
- Enter the old value.
- Enter the new value.
- Read the increase or decrease.
The formula
Percentage change = (new − old) ÷ |old| × 100
- old
- the starting value
- new
- the later value
Worked example
A price that went from ₹450 to ₹540
- Change = 540 − 450 = ₹90.
- Percentage change = 90 ÷ 450 × 100 = 20% increase.
- Multiplier = 1.2.
What the result means
A 20% rise followed by a 20% fall does not bring you back: you end at 96%.
Assumptions
- Old value is not zero.
Limitations
- Percentage change from zero is undefined.
Frequently asked questions
How do I calculate percentage increase?
(new − old) ÷ old × 100.
What is the difference between percentage change and percentage difference?
Change uses the old value as the base; difference uses the average of the two.
Why can’t I get a change from zero?
Any increase from zero is infinitely large in percentage terms.
Last reviewed on 3 October 2026. Found a mistake? Tell us.