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Percentage Calculator Online

Free tool for calculating percentages: X% of a number, percent change, add or subtract percent

percent-calculator
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X% of Y

Calculate a percentage of a number

?%

What % is X of Y

Find the percentage ratio of two numbers

±

Percent Change

Calculate the percentage change between two values

+%

Add/Subtract %

Add or subtract a percentage from a number

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Frequently Asked Questions

To find X% of a number, multiply the number by X and divide by 100. For example, 15% of 200 is 200 * 15 / 100 = 30.
Percentage change is calculated as: ((new value - old value) / old value) * 100. A positive result means an increase, a negative result means a decrease.
To add X% to a number, multiply it by (1 + X/100). To subtract, multiply by (1 - X/100). For example, a price of 1000 with a 20% discount: 1000 * 0.8 = 800.
Percentages are used for calculating discounts, markups, taxes, tips, loan and deposit interest rates, as well as analyzing statistical data and financial metrics.