Percentage Calculator
Calculate percentages, percentage change, and more.
What is% of
Percentage Formulas
X% of Y
(X / 100) × Y25% of 200 = 50
X is what % of Y
(X / Y) × 10050 is 25% of 200
% Change
((New - Old) / Old) × 10080 → 100 = 25% increase
Code Examples
// X% of Y
const percentOf = (percent, total) => (percent / 100) * total;
// Percentage change
const change = (old, newVal) => ((newVal - old) / old) * 100;Frequently Asked Questions
How do I calculate percentage increase?
Percentage increase = ((New - Old) / Old) × 100. For example, going from 50 to 75: ((75-50)/50) × 100 = 50% increase.