Everyday Tools
Percentage Change Calculator
Calculate percentage of a number, percentage change between two values, increase or decrease by a percentage and what percentage one number is of another.
%
%
Your results
15% of 20030
Change from 50 to 7550%
100 increased by 20%120
100 decreased by 20%80
25 is what % of 20012.5%
Calculation breakdown
- Percentage of a number
- (percentage ÷ 100) × value
- Percentage change
- ((to − from) ÷ |from|) × 100
- Increase / decrease by %
- base × (1 ± percentage ÷ 100)
- X is what % of Y
- (X ÷ Y) × 100
How this calculator works
This all-in-one percentage calculator shows four common calculations at once: percentage of a number, percentage change between two values, increasing or decreasing a value by a percentage, and working out what percentage one number is of another.
Frequently asked questions
How is percentage change calculated?
It is the difference between the two values, divided by the absolute value of the starting number, multiplied by 100.
Can percentage change be negative?
Yes. A negative result means the value has decreased.
Why do all four results show at once?
Each section uses its own inputs, so you can use the calculator for multiple everyday percentage questions without resetting it.
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