*Ss Brewing Technologies Giveaway - Enter Now!*

Home Brew Forums > Home Brewing Beer > Brewing Software > Beersmith vs. Online Calcs
Reply
 
LinkBack Thread Tools
Old 05-25-2008, 05:27 PM   #1
LeftyMcGee
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2008
Location: Maricopa, AZ
Posts: 45
Default Beersmith vs. Online Calcs

I downloaded Beersmith and have been trying it out. I have noticed the amount of hops needed to meet a specific style is dependent on the boil volume. I have formulated the same recipe on Beersmith, TastyBrew's Calc & BeerCalculus. When I change the boil volume on each to 2 gallons, they differ in the amount of hops required to meet a specific IBU. On an APA I was designing, Beersmith required 1/2oz (bittering hops / 60min) more than BeerCalculus and BeerCalculus required 1/2oz more than TastyBrew. It seemed like TastyBrew's recipe calc didn't even change the calculated IBU's when I changed my boil volume to 2 gallons.

I am new to homebrewing, but it seems to me that calculating IBUs is very mathematical and each of these resources should come up with fairly similar numbers. They all seemed to calculate the OG and FG within a fairly close range.

I was wondering if anyone could shed some light on why these three resources differ in their calculations. It seems like 1/2oz to 1oz difference in a bittering hop with 12.2%AA would make a pretty substantial difference in the taste of the brew.

__________________

Last edited by LeftyMcGee; 05-25-2008 at 08:35 PM.
LeftyMcGee is offline
 
Reply With Quote Quick reply to this message
Old 05-25-2008, 05:55 PM   #2
Yuri_Rage
Gritty.
HBT_MODERATOR.png
Feedback Score: 0 reviews
 
Yuri_Rage's Avatar
Recipes 
 
Join Date: Jul 2006
Location: Southwest
Posts: 13,920
Liked 609 Times on 376 Posts
Likes Given: 54

Default

You're right in that calculating IBUs is simply math. Unfortunately, it's not simple math. Quantifying bitterness is actually extremely difficult, and there have been many attempts at finding an algorithm that fits. There are at least three different algorithms (Tinseth, Rager, Garetz) commonly used in brewing, and each of them will result in a slightly different answer.

I use Tinseth (set in BeerSmith as the default algorithm), as I've heard that it's the most accurate for small batch brewing. Regardless of the accuracy, I find that I get expected and repeatable results by sticking to a single method.

__________________
Homebrewed Blog..........YouTube Channel .......... Shirts, posters, etc
Yuri_Rage is offline
 
Reply With Quote Quick reply to this message
Old 05-25-2008, 07:36 PM   #3
LeftyMcGee
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2008
Location: Maricopa, AZ
Posts: 45
Default

That makes sense. I did not realize that there were 3 different accepted algorithms for determining bitterness.

I am not sure what BeerCalculus uses, but I looked at TastyBrew and they also use Tinseth. I just tried their bitterness calculator and it was in the same range as Beersmith (about .4 IBU difference with same OG), but their recipe calculator is giving me way different IBUs. I used the same OG in the recipe and bitterness calculators. Guess their recipe calc is just off when it comes to determining bitterness.

Anyway, thanks for the info!

__________________

Last edited by LeftyMcGee; 05-25-2008 at 07:39 PM.
LeftyMcGee is offline
 
Reply With Quote Quick reply to this message
Old 05-25-2008, 07:46 PM   #4
Coastarine
We get it, you hate BMC.
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
Coastarine's Avatar
Recipes 
 
Join Date: Apr 2008
Location: New Bern, NC
Posts: 2,582
Liked 21 Times on 19 Posts
Likes Given: 1

Default

I have heard tinseth is best for small batch but full boil. If you're boiling less than the full volume of the batch, I've heard rager is better. Everyone who gets beersmith goes through the same thing, but i really love the program.

__________________
SEMPER FIDELIS ET SEMPER PARATUS Bringin' the 'pane...the propane.Coming Up:..[Hefewiezen][BCS Robust Porter][EdWort's Haus Pale Ale][Peated Ale]
Fermenting:.
Conditioning:[Oaked Cider][ESB]
On Tap.........[The Munchner][Spiced Cider][English Cider][Simcoe IPA][Triple Hops Grooved][Cider'n 'gnac]
Coastarine is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Trying to understand ABV calcs MikeRobrew Beginners Beer Brewing Forum 4 12-28-2008 09:38 AM
Beersmith water & orig. gravity calcs don't seem to work right JoePerri Brewing Software 8 11-21-2008 02:02 PM
IBU Calcs jacketsdb23 Recipes/Ingredients 4 10-15-2008 04:13 AM
refractometer calcs- can this be right? Hopleaf General Techniques 15 11-14-2007 11:51 AM
Beersmith water calcs for PM Cos All Grain & Partial Mash Brewing 2 09-13-2007 03:40 PM