Percentage Change Calculator
Your details
What do you want to find?
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Standard mode computes the percent change. Reverse modes find the unknown value when you already know the percent change.
Percent change (from old and new value)
New value (from old value and percent change)
Original value (from new value and percent change)
Original (old) value
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The starting number before the change occurred.
New value
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The resulting number after the change.
Show absolute difference
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Display the raw numeric difference alongside the percentage.
Reset
Percentage change
25%
Absolute difference
20
New value
100
Original value
80
Change multiplier
1.25
Direction
Increase
Original value
80
New value
100
▸
That is an increase of 25%.
Percentage change is the difference divided by the original value, not the new one. That base matters.
A rise then an equal-percentage fall does NOT return to the start. Percentages are not symmetric because the base changes.
The change multiplier is 1.25, meaning the new value is 1.25 times the original.
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