estimating original gravity - Home Brew Forums
Home Brew Forums > Home Brewing Beer > General Techniques > estimating original gravity

Reply
 
Thread Tools
Old 11-12-2006, 03:57 AM   #1
Jack
Recipes 
 
Aug 2006
Madison, Wisconsin
Posts: 343
Liked 4 Times on 3 Posts



I was just wondering... Is there an equation that allows you to estimate original gravity given the amount of extract that you use? I've had some batches that had a lower OG than I wanted, so I make a note to increase the amount of DME the next time I brew.



 
Reply With Quote
Old 11-12-2006, 04:17 AM   #2
todd_k
 
todd_k's Avatar
Recipes 
 
Jan 2006
RVA
Posts: 2,635
Liked 29 Times on 28 Posts


post the recipe please.


__________________
Primary:
Secondary:
Kegged: Smokier Smoked Porter

 
Reply With Quote
Old 11-12-2006, 06:48 AM   #3
Jack
Recipes 
 
Aug 2006
Madison, Wisconsin
Posts: 343
Liked 4 Times on 3 Posts


I sort-of found an answer to my original question on The Google, but I'd still be interested in hearing if anyone has any equations that they've found useful in recipe formulation.

On page 153 of the third edition Joy of Homebrewing (it's not numbered), Papazian says to make an ESB with 7 lbs LME. Using John Palmer's handy-dandy conversion between LME and DME, this works out to 5.6 lbs DME. When I made it this way the first time, the OG was only 1.042. When I bumped the DME to 6 lbs, it was 1.045. But it's still not at the 1.052 - 1.056 that Papazian says is appropriate for the style.

Both have been good beers, but I feel like I should call it a Special Bitter instead of an ESB if I can't get my OG to be higher.

The recipe the last time I made it was:
1 lb 60L crystal malt
6 lbs light DME
2.5 oz whole Kent goldings (60)
0.5 oz whole Kent goldings (30)
0.5 oz whole Kent goldings (15)
0.5 oz whole cascade (5)
5 gallons water

 
Reply With Quote
Old 11-12-2006, 07:06 AM   #4
Yuri_Rage
Gritty.
HBT_MODERATOR.png
 
Yuri_Rage's Avatar
Recipes 
 
Jul 2006
Southwest
Posts: 14,280
Liked 794 Times on 506 Posts


Your question kinda depends on the fidelity you want. I can roughly estimate the OG of all of your beers to be between 1.000 and 1.300 without ever seeing the recipe.

Seriously, though, the best way I can find to estimate the results of a recipe is by using some brewing software. I use BeerSmith, but I'm seriously considering a switch to Beer Tools Pro.

BeerSmith puts your recipe at 1.058.
__________________
Homebrewed Blog..........YouTube Channel .......... Shirts, posters, etc

 
Reply With Quote
Old 11-12-2006, 07:57 AM   #5
Jack
Recipes 
 
Aug 2006
Madison, Wisconsin
Posts: 343
Liked 4 Times on 3 Posts


You know... there's got to be an obvious explanation...

In the last few minutes of the boil, I top off my brew pot to compensate for the volume that evaporated.

Am I not supposed to do that?

 
Reply With Quote
Old 11-12-2006, 09:17 AM   #6
Torchiest
 
Torchiest's Avatar
Recipes 
 
Nov 2006
Houston, TX
Posts: 1,761
Liked 6 Times on 6 Posts


Quote:
Originally Posted by Yuri_Rage
Seriously, though, the best way I can find to estimate the results of a recipe is by using some brewing software. I use BeerSmith, but I'm seriously considering a switch to Beer Tools Pro.

BeerSmith puts your recipe at 1.058.
I've been using Beer Smith, and I'm really impressed with it, but I've only had it for a few weeks. Why do you think Beer Tools Pro is superior?
__________________
WORLD DOMINATION BEER
Kegged
#48 Black Helicopter Porter #49 Pikemen Porter
Up Next:
#50 Imperious IPA
#51 Razz Buried


 
Reply With Quote
Old 11-12-2006, 11:22 AM   #7
the_bird
10th-Level Beer Nerd
HBT_LIFETIMESUPPORTER.png
 
the_bird's Avatar
Recipes 
 
May 2006
Adams, MA
Posts: 20,880
Liked 522 Times on 420 Posts


Same question regarding BPT. I have three days left of my free BeerSmith trial, I have to make a decision.
__________________
Come join Yankee Ingenuity!

"I'm kind of toasted. But I looked at my watch and it's only 6:30 so I can't stop drinking yet." - Yooper's Bob
"Brown eye finally recovered after the abuse it endured in Ptown last weekend, but it took almost a full week." - Paulie
"no, he just doesn't speak 'stupid'. i, however, am fluent...." - motobrewer
"... I'll go both ways." - Melana

 
Reply With Quote
Old 11-12-2006, 11:30 AM   #8
chillHayze
 
chillHayze's Avatar
Recipes 
 
Mar 2006
Columbus OH
Posts: 1,589
Liked 16 Times on 16 Posts


Quote:
Originally Posted by the_bird
Same question regarding BPT. I have three days left of my free BeerSmith trial, I have to make a decision.
I'm wondering, too. I bought the BeerSmith, and wasn't really impressed with BT online. Is BTP a downloadable program, or is it just the quirky, slow drop-down menu based BT with more features?
__________________
RDWHAHB
Every little thing is gonna be alright.


 
Reply With Quote
Old 11-12-2006, 03:08 PM   #9
david_42
 
david_42's Avatar
Recipes 
 
Oct 2005
Willamina & Oak Grove, Oregon, USA
Posts: 25,593
Liked 151 Times on 142 Posts


OP - topping off could be the problem. A seemingly small amount of water can shift your OG a lot. Most recipes have you start with a little extra water (boil volume in most software), so you end up with 5 gallons, but I've had a few that start with 5, finish short and hit the OG exactly. Unlike many experienced brewers, I frequently do clone kits for variety . This requires following the directions exactly.


__________________
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"

"I would like to die on Mars, just not on impact." Elon Musk


 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Original Gravity???? chromedome Cider Forum 4 04-26-2009 11:25 PM
Estimating Gravity Sea All Grain & Partial Mash Brewing 3 06-24-2007 02:51 PM
Help with Original Gravity sircharles4848 All Grain & Partial Mash Brewing 3 06-04-2007 10:08 PM
Original gravity a little off paranode Extract Brewing 8 04-03-2007 01:54 PM
Help with original gravity? Nexus555 Beginners Beer Brewing Forum 2 03-12-2007 02:36 AM


Forum Jump