Our free percentage calculator lets you instantly compute percentages, percentage increases, decreases, and differences between two numbers. Whether you're calculating a discount at the store, figuring out a tip, working out a tax rate, or analyzing data at work, this tool gives you accurate results in seconds — no sign-up, no app download required.
To find X% of a number Y, multiply Y by X and divide by 100. For example, 15% of 200 = (200 × 15) ÷ 100 = 30. Our calculator does this automatically — just enter the percentage and the number.
Percentage increase = ((New Value − Old Value) ÷ Old Value) × 100. For example, if a price went from $80 to $100, the increase is ((100 − 80) ÷ 80) × 100 = 25%.
Divide the part by the whole and multiply by 100. For example, 30 is what percent of 120? (30 ÷ 120) × 100 = 25%. So 30 is 25% of 120.
Yes, completely free. No account, no sign-up, no app download. All calculations happen instantly in your browser.