How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 15% of 200 = (15 × 200) ÷ 100 = 30.

How do I calculate percentage change?

Subtract the original value from the new value, divide by the original value, then multiply by 100. A positive result is an increase; negative is a decrease.

What is the difference between percent change and percent difference?

Percent change measures change from one specific value to another (directional). Percent difference measures the relative difference between two values symmetrically, with no defined starting point.

How do I calculate a discount percentage?

Divide the discount amount by the original price and multiply by 100. Or use Mode 6 above — enter the original price and discount percentage to get the final price instantly.

How do I add tax to a price?

Multiply the price by the tax rate and add the result to the original price. For example, $100 + 8% tax = $100 × 1.08 = $108. Use Mode 5 above for instant calculation.

Free Percentage Calculator Online

Six percentage calculators in one: percent of a number, X is what percent of Y, percent change, percent difference, add a percentage, and subtract a percentage. Each updates live with a step-by-step formula.

What is X% of Y?

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X is what percent of Y?

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Percent Change

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Percent Difference

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Add Percentage (tax / tip)

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Subtract Percentage (discount)

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Frequently Asked Questions

How do I calculate a percentage of a number?: Multiply the number by the percentage and divide by 100. For example, 15% of 200 = (15 × 200) ÷ 100 = 30.
How do I calculate percentage change?: Subtract the original value from the new value, divide by the original value, then multiply by 100. A positive result is an increase; negative is a decrease.
What is the difference between percent change and percent difference?: Percent change measures change from one specific value to another (directional). Percent difference measures the relative difference between two values symmetrically, with no defined starting point.
How do I calculate a discount percentage?: Divide the discount amount by the original price and multiply by 100. Or use Mode 6 above — enter the original price and discount percentage to get the final price instantly.
How do I add tax to a price?: Multiply the price by the tax rate and add the result to the original price. For example, $100 + 8% tax = $100 × 1.08 = $108. Use Mode 5 above for instant calculation.