Percentage formulas
Percent of: Result = (Percentage / 100) × Number
What %: Percentage = (Part / Whole) × 100
% Change: ((New − Old) / Old) × 100
FAQ
How do I calculate a discount?
Use "What is X% of Y" — enter the discount percentage and the original price. Subtract the result from the original price to get the discounted price.
What is the difference between percentage increase and percentage points?
A change from 10% to 15% is a 5 percentage point increase, but a 50% percentage increase (5/10 × 100). They measure different things.