Percentage Change Calculator
Calculate the percentage increase or decrease between two values.
How it works
Fill in the 2 fields above and Percentage Change Calculator calculates the result instantly, recalculating as you change any value. It applies the formula change = (new − old) / |old| × 100. The math runs locally in your browser — nothing is sent to a server.
Formula
change = (new − old) / |old| × 100Examples
- Original value 200, New value 250 → Increase: 25%
Frequently asked questions
How do I use the Percentage Change Calculator?
Enter your values in the 2 input fields and the result is calculated automatically as you type. Change any value to see the numbers update instantly.
What formula does the Percentage Change Calculator use?
It uses change = (new − old) / |old| × 100. The calculation is performed in your browser using standard, well-established math for accurate results.
Is my data private?
Yes. The Percentage Change Calculator runs entirely in your browser. Nothing you enter is uploaded, saved to a server, or shared — it never leaves your device.
Is the Percentage Change Calculator free?
Yes, it is completely free with no sign-up, no limits and no watermarks. Like every tool on calculators and the rest of the platform, you can use it as often as you like.
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