Calculate percentages, percentage of a number, and percentage change
Enter values and click Calculate
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Percentage Calculator is a free online tool for solving the three most common percentage problems: finding a percentage of a number, determining what percentage one number is of another, and calculating percentage change between two values. Whether you need to calculate discounts, tax amounts, tip percentages, or grade percentages, this tool gives you instant results with the formula shown. All calculations are done in your browser — no data is sent anywhere.
1. X% of Y = (X/100) × Y Example: 15% of 200 = (15/100) × 200 = 30 2. X is what % of Y = (X/Y) × 100 Example: 45 is what % of 200 = (45/200) × 100 = 22.5% 3. % Change = ((New - Old) / Old) × 100 Example: From 80 to 100 = ((100-80)/80) × 100 = 25%