Conversions & Everyday
Percentage Calculator
Calculate percentages three ways — X% of Y, X is what % of Y, and percentage change between two values.
How this calculator works
Mode 1 (X% of Y): multiplies Y by X/100. Mode 2 (X is what % of Y): divides X by Y and multiplies by 100. Mode 3 (% change from X to Y): calculates (Y - X) / X x 100, showing whether the change is positive (increase) or negative (decrease). Results are shown to 2 decimal places.
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FAQ
Frequently asked questions
How do I calculate a percentage?
Three common calculations: (1) X% of Y = (X/100) x Y. Example: 15% of 200 = 30. (2) X is what % of Y = (X/Y) x 100. Example: 30 is 15% of 200. (3) % change = ((new - old) / old) x 100. Example: 200 to 230 = +15% change.
How do I calculate a discount?
To find the discounted price: original price x (1 - discount%/100). For a 25% discount on $80: $80 x 0.75 = $60. The discount amount is $80 x 0.25 = $20.
What is the difference between percentage and percentage points?
A move from 10% to 15% is a 5 percentage point increase, but a 50% increase in relative terms. This distinction matters in finance and statistics — 'interest rates rose 0.25 percentage points' is very different from 'interest rates rose 0.25%'.
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