Percentage Change Calculator
Find the exact percentage increase or decrease between two numbers — with the formula, direction and absolute difference all shown.
What Does This Tool Do?
Enter an original and a new value to instantly find the percentage change. The tool shows the formula with substituted values, the direction (increase or decrease), and the absolute numerical difference.
Key Features
Increase & Decrease
Handles both positive and negative changes with colour coding.
Formula Shown
Full calculation displayed: ((new−orig)/|orig|)×100.
Instant Result
Answer calculated on button click.
4dp Precision
Result precise to 4 decimal places.
How to Use
- Enter the original (starting) value.
- Enter the new (ending) value.
- Click Calculate % Change.
Frequently Asked Questions
What is the percentage change formula?▾
Percentage Change = ((New Value − Original Value) ÷ |Original Value|) × 100. A positive result is an increase; negative is a decrease.
What if the original value is negative?▾
The formula uses the absolute value of the original in the denominator, which is the standard method when the base is negative.
How is this different from percentage difference?▾
Percentage change has a direction (from original to new). Percentage difference is symmetric — it does not distinguish which value is the baseline.