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Percentage Increase & Decrease Calculator

Instantly calculate the percentage difference between two values or apply a percentage change to any number.

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Percentage Increase & Decrease Practice Worksheets

Generate unlimited printable PDF worksheets for Percent Change, Markups, Discounts, and Growth with answer keys.

Understanding Percentage Change

Percentage change is a mathematical concept that describes the relative change between an old value and a new value. It is widely used in finance to track stock growth, in retail to calculate discounts, and in science to report experimental variance.

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Percentage Change Formula

Percentage Change = ((New Value - Original Value) / Original Value) × 100

Examples

Calculating a Price Hike

((50 - 40) / 40) × 100 = 25% Increase. =

Calculating a Discount

((90 - 120) / 120) × 100 = -25% (or 25% Decrease). =

Frequently Asked Questions

What is the formula for percentage increase?

Subtract the original value from the new value, divide by the original value, and multiply by 100.

Can percentage decrease be more than 100%?

No, if a value decreases by 100%, it becomes zero. It cannot decrease by more than its total value in standard arithmetic.