TetraKitsPercentage Change Calculator
Enter an original value and a new value to calculate percent change — see whether it is an increase or decrease, the percentage, and the absolute difference instantly.
Read: Percentage Change Calculator Guide: Increase & Decrease →
- Free to Use
- No Signup
- Privacy Friendly
How to calculate percent change
- 1
Enter original value
Type the starting amount — old price, previous score, or baseline metric.
- 2
Enter new value
Type the updated amount to compare against the original.
- 3
Read percent change
See the percentage increase or decrease plus the absolute dollar or unit difference.
Percent change formula
Example: 80 → 100 = +25% increase (absolute change +20)
Why Use This Tool?
Increase & Decrease
Positive percent for growth, negative for decline.
Absolute Diff
See both percentage and raw dollar or unit change.
Finance Ready
Track stock moves, sales growth, and price changes.
Private
Your numbers stay on the device.
Frequently Asked Questions
What if the original value is zero?
Percent change from zero is undefined (division by zero). Enter a non-zero original value.
Is a drop shown as negative?
Yes. Decreases show negative percent change — e.g. 100 → 80 = −20%.
How is this different from percentage calculator?
This tool compares two values over time. The percentage calculator handles "X% of Y" and other modes.
Can I use this for stock returns?
Yes. Enter purchase price as original and current price as new for percent gain or loss.
Is this percentage change calculator free?
Yes. Unlimited calculations with no signup.
Growth Rates Without Spreadsheet Formulas
Sales reports, investment returns, and grade improvements all ask "what percent did this change?" — but the ((new − old) ÷ old) × 100 formula is easy to invert. Enter both values and read the answer instantly.
