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Percentage Change Calculator

Instantly determine the percentage increase or decrease between two numbers. Whether you're comparing stock prices, weight loss, or sales period over period, our free tool solves it easily.

How It Works

Our calculator uses the standard percentage change formula: ((New Value − Old Value) / |Old Value|) × 100. A positive result indicates an increase; a negative result indicates a decrease. The absolute value of the old value ensures the correct result even when the starting number is negative.

When to Use This

Use this when tracking growth over time, such as revenue changes quarter to quarter, price differences, weight loss progress, or any before/after comparison where you need a percentage result.

How to Use the Calculator

  1. 1

    Input Original Value

    Enter the starting number into the 'Old Value' field.

  2. 2

    Input New Value

    Enter the ending number into the 'New Value' field.

  3. 3

    Review the Change

    The calculator instantly shows whether it is an increase or decrease, the absolute difference, and the exact percentage change.

Frequently Asked Questions

How do I calculate percentage change?
Subtract the old value from the new value. Divide that difference by the absolute value of the old value. Multiply by 100 to get the percentage.
What is a percentage increase?
A percentage increase occurs when the new number is larger than the original number, representing growth over time.
Can percentage change be negative?
Yes. A negative percentage change simply means a percentage decrease (the new number is smaller than the original).

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