Usually the manufacturer of the malt product will put that information on the packaging, for example, the wheat DME I get at my LHBS says 50% wheat / 50% barley. I would imagine that almost all wheat malt extract products are some combination of wheat and barley that is close to 50/50.
As for LME-DME conversion, I would use the 20% rule whether it was wheat or barley extract, meaning that you would typically use 20% less DME compared to LME because of the water content of the LME. Conversely, you would use 20% more LME than DME. Here's the formulas:
DME to LME > X lbs DME x 1.2 = Y lbs LME
LME to DME > Y lbs LME x .8 = X lbs DME
Last edited by headfullahops; 06-05-2009 at 01:46 PM.
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