📐 Math
Percentage Calculator
Calculate percentages three ways: find a percentage of a value, determine what percent one number is of another, or calculate the percentage change between two values.
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Formula
P% of X = (P / 100) × X
X is what % of Y = (X / Y) × 100
% Change = ((B − A) / |A|) × 100P- Percentage value
X- Base value or part
Y- Whole or reference value
A- Starting value (for % change)
B- Ending value (for % change)
Example
Calculating Percentage Change
Find the percentage increase from an original value of 40 to a new value of 50.
- Calculate the difference: 50 - 40 = 10
- Divide the difference by the original value: 10 / 40 = 0.25
- Multiply by 100 to get the percentage: 0.25 × 100 = 25%
- Result: 25% increase.
Frequently Asked Questions
Select "% of a value", enter 15 in the first field and 200 in the second. The result is 30.
Select "% change", enter the starting value and ending value. A positive result means an increase; negative means a decrease.
Select "X is what % of Y", enter 45 and 180. The result is 25%.