A percentage calculator is a tool or software application that calculates the percentage of a number or the percentage increase or decrease between two numbers. It is commonly used in finance, business, and academic settings for calculations such as tax rates, discounts, and grade point averages.

Percentage calculators work by converting the percentage to a decimal, multiplying it by the original number, and returning the result. Some percentage calculators may also allow users to calculate the percentage of a part of a whole or the percentage change between two numbers.

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In addition to calculating percentages, some percentage calculators may also provide additional information such as the total cost of a product after a discount or the final grade average of a student.