DME and Specific Gravity - Home Brew Forums

 Home Brew Forums > DME and Specific Gravity

03-12-2008, 11:49 PM   #1
dubbel dutch

Recipes

Oct 2007
Plattsburgh, NY
Posts: 79

Is there any exact science to how much DME extract to add for reaching a desired gravity reading?

For example, if I wanted to make 3 gallons of beer with an original gravity of 1.044 how much DME would I have to add?

After doing some research the formula I've adapted for this is:

( x lbs DME x 45 points) / 3 gallons = 44

solve for x...

x = 44 x (3/45)
x = approx. 2.93 lbs.

I know that gravity has to do with multiplying weight x PPG of the extract, but do all DME's have a PPG of 45 and is the above formula going to work for all situations?

__________________
All beer is essentially the same, it is all fermented piss colored water!
On Deck: Hennepin Clone
Primary: DD Frankenbeery
Secondary: 2 Cats Brown Ale
Bottled: Heather Honeyed IPA, Orange Melomel, Blackberry/Peach Wheat, Pumpkin Ale

03-13-2008, 02:40 AM   #2
smizak
Recipes

Dec 2007
Buffalo, NY
Posts: 1,828
Liked 112 Times on 82 Posts

I do know that Briess DME contributes 43 pts. per pound per gallon.

03-13-2008, 04:01 AM   #3
dubbel dutch

Recipes

Oct 2007
Plattsburgh, NY
Posts: 79

Cool. I want to make a braggot, now just have to figure out how much PPG there is in honey. But I'll probably just wing it.
__________________
All beer is essentially the same, it is all fermented piss colored water!
On Deck: Hennepin Clone
Primary: DD Frankenbeery
Secondary: 2 Cats Brown Ale
Bottled: Heather Honeyed IPA, Orange Melomel, Blackberry/Peach Wheat, Pumpkin Ale

03-13-2008, 02:27 PM   #4
Moonpile

Recipes

Apr 2007
Posts: 668

Quote:
 Originally Posted by glas9396 Cool. I want to make a braggot, now just have to figure out how much PPG there is in honey. But I'll probably just wing it.
I think honey varies a bit. ProMash lists it at 1.042 per pound per gallon and Beer Smith has it at 1.035.

03-13-2008, 02:39 PM   #5
HP_Lovecraft
Recipes

Jan 2008
Posts: 196
Liked 3 Times on 3 Posts

Usually with meads, I'll add a little more honey that I think I'll need, then dilute down to the gravity I want. This is because of the issue noted above that honey varies GREATLY even season to season, brand to brand, location to location.

For something more complex like a Braggot, a better idea is to "proof" that batch of honey by making a very small sample to test with a hydrometer. Like gradually adding honey to 10oz of water, an ounce at a time. Then note the amount when you hit your spot. This way your not diluting your malt as with the method above.

For a braggot, I might expect to proof around 1oz honey to 8oz water (while like 3-5oz for heavier meads).

03-13-2008, 03:17 PM   #6
dubbel dutch

Recipes

Oct 2007
Plattsburgh, NY
Posts: 79

Hey HP that's a good idea. I'm now looking for an objective way to determine PPG of a fermentable. I suppose if one measured the specific gravity of a certain quantity of honey in a certain quantity of water they could then figure the PPG of the fermentable. But then would this figure remain constant? Math is not my fourté sorry if this is painfully obvious to some.
__________________
All beer is essentially the same, it is all fermented piss colored water!
On Deck: Hennepin Clone
Primary: DD Frankenbeery
Secondary: 2 Cats Brown Ale
Bottled: Heather Honeyed IPA, Orange Melomel, Blackberry/Peach Wheat, Pumpkin Ale