% Percentage Calculator
Calculate percentages, percentage change, and "X is what % of Y" questions.
How to Calculate Percentages
To find what X% of Y is, multiply Y by X and divide by 100. For example, 15% of 200 is 200 × 15 / 100 = 30. This is useful for tips, discounts, taxes, and many everyday calculations.
Percentage Change Formula
To find the percentage change between two numbers, subtract the old value from the new value, divide by the old value, and multiply by 100. A positive result means an increase, while a negative result means a decrease.
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