Calculate:
X (percentage)
Y (number)
Result
Common percentage formulas
X% of Y
Multiply Y by X/100. Example: 20% of 500 = 100
% change
(New − Old) / |Old| × 100. Positive = increase, negative = decrease.
Add / subtract %
Adding 10% to 200 = 200 × 1.10 = 220. Subtracting 10% = 200 × 0.90 = 180.