badlee

Recipes 

To me it seems that every time I use a different brew calculator( I like beercalculus) I get a different amount of IBUs with the same hops,weights and times.
What's the difference between say Rager and Tinseth? Oh, and the others?
Is there a general agreement on what is the best?
I found a difference of over 10 IBUs when switching between Tin and Rag

ArcaneXor

Recipes 

Sometimes Tinseth can be almost twice as much as Rager. The formulas are all bad, so it's best to pick one and stick with it, understanding that there is more to the bitterness we perceive than isomerized alpha acids, and MUCH more than a poor deterministic approximation thereof. I use Rager, personally.

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The Fiesty(sic) Goat Brewery est. 2007 & Clusterfuggle Experimental Ales est. 2009
Planned: Fat Man Porter, sLambic II, Brettennial Falcon IPA, Flanders Red, Orange Blossom Mead
Primary: Winexpert Riesling Ice Wine, sLambic I
Secondary: Flanders Red
Kegged:Black or Blue EyePA, Cherrywood-aged Crystal Stout,
2013 dump volume: ~2 gallons

badlee

Recipes 

Cheers for that. I was starting to come to that conclusion myself,lol.

Greyhound

Recipes 

I use Rager just because that's what I've always used. I don't pretend to know exactly how many IBU's are really in my beer, but by sticking with the same formula I have a good idea how one beer will compare to the next. My advice would be to pick a formula and stay with it.

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"Give a man a beer, waste an hour. Teach a man to brew, and waste a lifetime!" -Bill Owen

badlee

Recipes 

I did a little experiment yesterday. I fed in these details; 10 ltrs 20gr nugget 9% pellets@ 60, another 15gr @ 15 and 15gr dry hop.
I chose the "average" option after Tinseth,Rager and Garetz. The average was NOT an average at all,but some 20 IBUs less that the other 3.