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Old 03-30-2010, 06:35 PM   #1
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Default What is the conversion for DME to corn sugar?

If a recipe calls for 1kg of corn sugar, and I wanted to use DME, what is the conversion? Is it just 1 kg dextrose = 1kg DME?

And would this be the same if a reciple calls for 1kg table sugar? I have a Cooper's kit, and wanted to use a DME for the dark ale.

I understand the debate between corn/table/DME, just want to know the conversion. Thanks in advance!

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Old 03-30-2010, 06:45 PM   #2
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This works pretty good...
http://www.tastybrew.com/calculators/priming.html

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Old 03-30-2010, 06:53 PM   #3
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I'm talking about in the beginning when making the wort. The Cooper's kit I believe calls for 1 kg of sugar for the 5 gallons (before adding the yeast).

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Old 03-30-2010, 07:41 PM   #4
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Corn sugar is 1.046 pppg while DME is 1.044 pppg. So if you use the formula:

Amount of DME = amount of corn sugar/.9981

That should get you close. The conversion would be the same for table sugar as it is also 1.046 pppg.

To use your example, 1kg of corn sugar would translate to 1.002kg of DME.

EDIT: Totally hosed my math.

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Old 03-30-2010, 08:18 PM   #5
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Thanks Mojotele.

It basically looks like its pound for pound then. The reason I asked is that I called my local homebrew about this question. They said to use 3 lbs, which I thought was absurd.

I'm going to mix it up a bit, majority being DME and the rest dextrose, or maybe some table sugar (keep it under the 20% mark though).

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Old 03-30-2010, 09:00 PM   #6
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Yeah, it's basically pound for pound. I'd measure out an equal proportion than add a pinch more DME.

I'd stay away from table sugar entirely, though.

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Old 03-30-2010, 10:41 PM   #7
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Quote:
Originally Posted by mojotele View Post
Corn sugar is 1.046 pppg while DME is 1.044 pppg. So if you use the formula:

Amount of DME = amount of corn sugar/.9981

That should get you close. The conversion would be the same for table sugar as it is also 1.046 pppg.

To use your example, 1kg of corn sugar would translate to 1.002kg of DME.

EDIT: Totally hosed my math.
I believe the real figures are:
DME 1.046 pppg
Corn Sugar 1.042 pppg
Sucrose 1.046 pppg
LME 1.037 pppg
where pppg is points per lb per gallon
So you would need about 10% more corn sugar than DME to get the same fermentables, or 20% more LME.
If you are talking about small additions (which you are) to adjust a recipe, I agree with mojotele, the differences are pretty insignificant, If the additions are a major component of the fermentables, then the differences can add up.

-a.
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Old 03-31-2010, 08:08 PM   #8
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Huh, my bad. I got those numbers out of BeerSmith. Did I grab the wrong numbers or is BeerSmith wrong?

EDIT: This is what I used from Beersmith.

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Old 03-31-2010, 11:16 PM   #9
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I think Beersmith is wrong.
Promash, and most of the texts that I have read quote 1.046.
I just checked Designing Great Beers, and that splits the difference with 1.045

-a.

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Old 04-01-2010, 08:33 PM   #10
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I agree with you on Beersmith being wrong. Every Internet source I can find has the DME potential being higher and the corn sugar potential being lower. Thanks!

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