Percentage Calculator
Free online percentage calculator — find X% of Y, what percent X is of Y, and percentage change between two numbers.
How to Calculate Percentages
Percentages are used everywhere — from shopping discounts and tax calculations to grades and statistics. This free percentage calculator handles three common scenarios: finding X% of a number, finding what percent one number is of another, and calculating percentage change between two values.
FAQ
How do I calculate what percent X is of Y?
Divide X by Y, then multiply by 100. For example, 25 is what percent of 200? → (25 ÷ 200) × 100 = 12.5%. Use the "X is what % of Y?" tab in our calculator for instant results.
How do I find X% of a number?
Multiply the number by X and divide by 100. For example, 15% of 80 = (80 × 15) ÷ 100 = 12. Our calculator handles this automatically.
How do I calculate percentage change?
Use the formula: ((New Value − Old Value) ÷ Old Value) × 100. A positive result means an increase, negative means a decrease. Switch to the "% Change" tab for instant calculation.