Replacing grain with extract - conversion help - Home Brew Forums

 Home Brew Forums > Replacing grain with extract - conversion help

02-15-2013, 12:56 PM   #1
mezhan
Recipes

Feb 2013
Fort Wayne, Indiana
Posts: 13

Hey all,

So I've read that when you replace malted grain with extract, there is a pound to pound conversion. The numbers I've read at .65 for DME and .75 for LME (can anyone vouch for these?) but my question is do I need to use a multiplier for tun efficiency?

For example, I would add 7 lbs to my tun but the efficiency is only 0.85. Do I take 7*0.85 then multiply it by 0.65 if I want to get pounds of LME? I assumed the extracts are 100% efficiency.

Thanks!
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02-15-2013, 01:08 PM   #2
progmac
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Mar 2012
Cincy, OH
Posts: 1,969
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potential gravity of ---
2-row: 1.036
LME: 1.038
DME: 1.042

36 * 0.70 mash efficiency = 25.2
25.2 / 38 = 0.66
25.2 / 42= 0.60

therefore if an all grain recipe assumes 70% efficiency, your ratio would be 0.66 pounds of liquid extract per pound of grain or 0.6 pounds of dry extract per pound of grain.

in a high-efficiency example, like your 85% example, the ratio would be
36* 0.85 = 30.6
30.6 / 38 = 0.81
30.6 / 42 = 0.73

therefore with 85% mash efficiency, your ratio would be 0.81 pounds of LME per pound of grain or 0.73 pounds of DME per pound of grain.

-------
the "short" answer is that the "typical" conversions you see assume an efficiency in the 68-75% range.
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02-15-2013, 01:19 PM   #3
mezhan
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Feb 2013
Fort Wayne, Indiana
Posts: 13

Quote:
 Originally Posted by progmac ...redacted, recalculating
haha, well my thought is that those conversion numbers must be somewhat accurate otherwise you'd hear peoples OGs and FGs turned out different than they expected.

I suspect it would be a per brewer calculation, as depending on your tun and method you will result in different efficiencies.
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02-15-2013, 01:24 PM   #4
progmac
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Mar 2012
Cincy, OH
Posts: 1,969
Liked 277 Times on 221 Posts

Quote:
 Originally Posted by mezhan haha, well my thought is that those conversion numbers must be somewhat accurate otherwise you'd hear peoples OGs and FGs turned out different than they expected. I suspect it would be a per brewer calculation, as depending on your tun and method you will result in different efficiencies.
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02-15-2013, 01:26 PM   #5
mezhan
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Feb 2013
Fort Wayne, Indiana
Posts: 13

Quote:
 Originally Posted by progmac i edited my original reply, should be more helpful
Awesome response, much appreciated! A lot more information than I expected, which is always a good thing!
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02-15-2013, 01:39 PM   #6
whoaru99
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Oct 2012
Posts: 1,760
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Hopefully not too much of a side-track, but looks like about 10% difference between LME and DME. I thought it was more like 20% difference based on previous readings?
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02-15-2013, 01:48 PM   #7
progmac
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Mar 2012
Cincy, OH
Posts: 1,969
Liked 277 Times on 221 Posts

Quote:
 Originally Posted by whoaru99 Hopefully not too much of a side-track, but looks like about 10% difference between LME and DME. I thought it was more like 20% difference based on previous readings?
I noticed that too. I used a potential gravity of 1.042 for DME, but I think in reality some of it is more like 1.045.

assuming 1.045 instead of 1.042 would make it look like:
2-row: 1.036
LME: 1.038
DME: 1.045

again using the examples of a 70% grain mash efficiency and an 85% grain mash efficiency --

36 * 0.70 mash efficiency = 25.2
25.2 / 38 = 0.66 pounds of lme per pound of grain
25.2 / 4= 0.56 pounds of dme per pound of grain

36 * 0.85 mash efficiency = 30.6
36* 0.85 = 30.6
30.6 / 38 = 0.81 pounds of lme per pound of grain
30.6 / 45 = 0.68 pounds of dme per pound of grain
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