Math
Percent Calculator
The percent calculator that actually has the three modes you need: % of, what %, and % change. Pick a mode, plug in numbers, get your answer instantly.
Enter two numbers to see your answer.
Quick examples
15% of 80
12
25 is what % of 200?
12.5%
% change 50 → 65
+30%
Formulas
X% of Y = (X ÷ 100) × Y
X is what % of Y = (X ÷ Y) × 100
% change = ((B − A) ÷ A) × 100
FAQ
What's the difference between percent change and percent difference? +
Percent change has a direction (A → B). Percent difference is the magnitude between two values relative to their average, used when neither is a baseline.
How do I calculate a tip? +
Use 'X% of Y'. Enter the tip percentage (e.g. 18) and the bill total. The result is the tip amount.
What about a discount? +
Use 'X% of Y' to find the discount amount, then subtract it from the original price.