D-max calculator.


This calculator will help you to determine the D-max point based on your data-set.

Detailed explanation is in the article.

The default example has 10 data-points.

You can add more data-points (“+Add row” button), but you cannot have less than 10.

In my opinion, if you have less than 10 pairs of data,  you don’t need math. Just choose the D-max point visually.

Enter your data and click “Calculate”.

Do not leave empty rows!

All results will be displayed in the bottom-right box.

This includes:

The D-max point. The average rate of increase of parameter. Coefficients of Determination R^2.



Graph Data

Workload/time Parameter (e.g. BL, ventilation, etc.) Actions

Fit-line (3-order polynomial)

R² :
Slope (average increase) :

D-max point: Root (only positive) of quadratic equation (3ax² + 2bx +c-slope=0) :