The computer at this site uses beam in its computations:
http://www.image-ination.com/sailcalc.html

[The page is pretty slow to load]

The calculator is set up to make comparisons between boats, but it is not necessary to add another boat to the second window. Select the Pearson Commander in window #1, then move down the page to see the resulting input data and computations. Hull speed shown is about the same as with the other calculator.