DME and Specific Gravity - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Extract Brewing > DME and Specific Gravity

Reply
 
Thread Tools
Old 03-12-2008, 11:49 PM   #1
dubbel dutch
 
dubbel dutch's Avatar
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?



Thanks in advance!
__________________
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

 
Reply With Quote
Old 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.

And your equation is right.

 
Reply With Quote
Old 03-13-2008, 04:01 AM   #3
dubbel dutch
 
dubbel dutch's Avatar
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

 
Reply With Quote
Old 03-13-2008, 02:27 PM   #4
Moonpile
 
Moonpile's Avatar
Recipes 
 
Apr 2007
Pasadena, MD
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.

 
Reply With Quote
Old 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).

 
Reply With Quote
Old 03-13-2008, 03:17 PM   #6
dubbel dutch
 
dubbel dutch's Avatar
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

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
specific gravity castillo Fermentation & Yeast 3 09-22-2009 07:44 AM
Specific gravity seems way off! Help skazzonline Beginners Beer Brewing Forum 9 04-27-2009 05:46 PM
Specific Gravity?? when and how much Eepa Beginners Beer Brewing Forum 7 02-05-2009 01:56 AM
Specific Gravity? Target Gravity? HalloweenGod General Techniques 6 01-03-2009 07:30 PM
Specific Gravity Beer Snob All Grain & Partial Mash Brewing 3 07-20-2006 06:59 AM


Forum Jump