Can percentage change be negative?
Yes. A negative result means the second value is below the first value.
Percentage Calculator
Find a percentage of a number, compare values, or calculate percentage change.
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Adjust the values below to get a clear estimate.
Percentage formulas
Each operation uses a direct arithmetic relationship. Percentage change uses the starting value as the comparison baseline.
p% of x = (p / 100) × x; x is what % of y = (x / y) × 100; change = ((new − old) / old) × 100Worked example
Finding a discount amount
Inputs: percentage: 15 · value: 80
Illustrative result: 12
Fifteen percent of 80 is 0.15 multiplied by 80.
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Frequently asked questions
Why can’t the base value be zero?
A percentage comparison divides by the base. Division by zero is undefined.