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Percentage Change Calculator

Calculate the percentage increase or decrease between two values. Shows direction, absolute difference, and the formula used.

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Values
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Enter both values to calculate
Quick examples

What is Percentage Change?

Percentage change expresses the relative difference between an old and a new value as a percentage. A positive result is an increase; a negative result is a decrease. The formula is: (new value ∀original value) ÷ |original value| × 100. It is widely used in finance, statistics, and everyday comparisons.

How to Use Percentage Change

  1. Enter the original (starting) value in the first field.
  2. Enter the new (ending) value in the second field.
  3. The percentage change, direction, and formula appear instantly.
  4. Click Swap to reverse the direction of comparison.
  5. Use the quick example buttons to explore common scenarios.

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Percentage Change vs Percentage Difference ▾
Example
Input From 100 to 150
Output +50% increase
Common Use Cases
  • Comparing prices before and after a sale
  • Tracking stock or investment performance
  • Measuring growth in revenue or user numbers
  • Checking year-over-year change in metrics
Frequently Asked Questions
What is percentage change?

Percentage change measures how much a value has increased or decreased relative to its original value. Formula: (new ∀old) ÷ |old| × 100.

What is the difference between percentage change and percentage difference?

Percentage change uses the original value as the base and indicates direction (increase/decrease). Percentage difference uses the average of both values and has no direction —it just measures gap size.

What does a negative percentage change mean?

A negative result means the value decreased. For example, ∀5% means the new value is 25% lower than the original.

What is the multiplier?

The multiplier shows how many times larger the new value is compared to the original. A multiplier of 1.5 means the value grew to 1.5× its original size (a 50% increase).