Free percentage calculator. Work out what percent of a number is, find percentage change (increase or decrease), calculate percentage difference, reverse percentage and more. Six calculation types — fast and easy for students and professionals worldwide.
Six types of percentage calculations — all free, all instant
This calculator solves all six common percentage problems in one place. No need to remember formulas — just enter your numbers and get the answer instantly.
Multiply Y by X and divide by 100. Example: 15% of 200 = (200 × 15) ÷ 100 = 30. Use this for tips, discounts, tax amounts and commission calculations.
Divide X by Y and multiply by 100. Example: 30 is what % of 150 = (30 ÷ 150) × 100 = 20%. Use this for exam scores, survey results and proportions.
Subtract old from new, divide by old, multiply by 100. Example: from 80 to 100 = ((100−80) ÷ 80) × 100 = +25%. Use this for price changes, growth rates and performance tracking.
To increase: multiply by (1 + percent/100). To decrease: multiply by (1 − percent/100). Example: 200 increased by 15% = 200 × 1.15 = 230.
Divide the value by the percentage and multiply by 100. Example: 85 is 70% of what? = (85 ÷ 70) × 100 = 121.43. Use this when you know the result and percentage but need the original.
Divide the absolute difference by the average of both numbers, multiply by 100. Example: between 40 and 60 = (|60−40| ÷ ((40+60)÷2)) × 100 = 40%. Used when neither value is the reference point.
Percentages are used in every country in the world — from calculating VAT (UK), GST (Australia, Canada, India), sales tax (USA) and other consumption taxes, to working out exam scores, discounts, pay rises, investment returns and tip amounts.
A percentage expresses a number as a fraction of 100. A percentile shows the value below which a given percentage of observations fall — used in test scores, growth charts and statistical analysis. This calculator handles percentage calculations. For percentile calculations, see your specific test or assessment guidelines.