A percentage calculator helps you quickly calculate percentages in various scenarios. Our free tool handles percentage calculations including finding what percentage one number is of another, calculating percentage increase or decrease, and finding the original value before percentage changes.

Perfect for students, business professionals, shoppers calculating discounts, and anyone needing quick percentage calculations without manual math.

Choose the type of calculation you need: percentage of a number, percentage increase/decrease, or percentage difference. Enter the values in the input fields, and results appear instantly.

Our calculator shows step-by-step calculations and formulas used, helping you understand the math behind percentage calculations.

Calculate what is X% of Y (e.g., What is 15% of 200?). Find what percentage X is of Y (e.g., 30 is what percent of 150?). Calculate percentage increase from X to Y (e.g., increase from 100 to 125).

Determine percentage decrease from X to Y (e.g., decrease from 200 to 150). Calculate the percentage difference between two numbers for comparison purposes.

Shopping: Calculate discounts and sale prices. Finance: Determine interest rates, profit margins, and investment returns. Education: Solve percentage problems and check homework answers.

Business: Calculate commission rates, tax amounts, markup percentages, and growth rates. Health: Track weight loss or gain percentages and body fat percentage changes.

Percentage of a number: (Percentage / 100) × Number. Example: 25% of 80 = (25/100) × 80 = 20. Percentage increase: ((New Value - Original Value) / Original Value) × 100.

Percentage decrease: ((Original Value - New Value) / Original Value) × 100. Percentage difference: (|Value 1 - Value 2| / ((Value 1 + Value 2) / 2)) × 100.