Extract to Grain Conversions
Everyone comes across a recipe that they want to try that does not match their brewing technique. Here are a few simple rules to help convert extract to grain or grain to extract.
1 lb Dried Malt Extract (DME) in 1 gallon of water produces a specific gravity (SG) of 1.045
1 lb Liquid Malt Extract (LME) in 1 gallon of water produces a specific gravity (SG) of 1.036
For grains, it is a bit more complex. A typical base malt will produce a maximum SG of 1.035 with 1 lb of grain mashed and in 1 gallon of water. This assumes a 100% efficiency, which is not what a brewer can expect. The brewer must figure out his or her own efficiency and multiply that percentage by 1.035. A typical brewery efficiency is 75%, therefore, the expected SG for one lb of base malt mashed and in one gallon of water would be 1.035 X 75% or 0.75 = 1.027.
This leaves us with a few things to sum up.
lbs of LME = SG of mashed grain (1lb in 1 gallon or 1.027) divided by 1.036 multiplied by lbs of grain
LME lbs = 1.027/1.036 X Grain lbs
Grain lbs = 1.036/1.1.027 X LME lbs
For DME, substitute 1.045 for 1.036 in the equations above
A DME to LME is as follows: LME lbs = DME lbs / 0.80 OR DME lbs = LME lbs X 0.80