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To calculate a percentage of a number, multiply the number by the percentage and divide by 100. For example, 15% of 200 = 200 × 15 ÷ 100 = 30. Our calculator does this instantly for any values you enter.
The formula is simple: Result = (Percentage ÷ 100) × Number. This works for any percentage and any number, including decimals. You can also think of it as moving the decimal point of the percentage two places to the left, then multiplying.
Percentage calculations come up constantly in daily life: calculating tips at restaurants, figuring out sale discounts, determining tax amounts, computing grades on tests, understanding interest rates, and analyzing data. Knowing how to quickly calculate percentages is one of the most practical math skills.