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.
Complete Guide to Percentage Change Calculator
When To Use This Tool
Use Percentage Change Calculator whenever you need fast, accurate output without installing software. This tool is designed for speed, clarity, and repeatable results for day-to-day work.
Best Practices for Accurate Results
- Double-check the format of your input before running the tool.
- Test with a small sample first, then process larger data.
- Use Related Tools to verify, convert, or transform the output.
Why Users Prefer AdeDX
AdeDX tools are browser-based, free to use, and built to work across desktop and mobile devices. Most processing happens directly in your browser for fast performance and improved privacy.