DME is about 40 points per pound per gallon.
DME carries points per pound per gallon (PPG) value of 46. DME's PPG value is used to determine the maximum extract possible from a batch of malt based on it's dry basis, fine grind (DBFG) percentage
Briess 2-Row DBFG = 80.5%
Briess 2-Row extract in PPG = 0.805 x 46 = 37 PPG
Hey S.C., never seen that. If you have some information that shows how that is a reference standard, can you share?
The method to determine the extract from a batch of malt is the Congress Mash, which has a procedure for preparing the malt, the fine grind, the water is distilled, the time and temp are specified. And so on. http://www.brewingwithbriess.com/blog/understanding-a-malt-analysis/
Noonan has some information on malt analysis, too.http://morebeer.com/brewingtechniques/bmg/noonan.html
The brewers that have mash presses/filters can exceed 100% by a little, as they squeeze the mash and get more liquid out.
I am really looking forward to the Malt book by John Mallett. Now that the Water book is out, I think that malt is the area that is lacking in information.