Opening a can of worms:
Some of you know I'm busy with bugubrew - which had me have a closer look at the formulas of calculating ibu's. There are several people with a different approach about what factors need to be considdered. The one I want to focus on in Tinseth - which seems to be a favourite to be referered to on the web when calculating ibu's.
I found a webpage edited/created/verified by Glenn Tinseth with his formulas on it:
https://realbeer.com/hops/research.html
More here:
https://www.realbeer.com/hops/FAQ.html#units
His simple calculator:
https://www.realbeer.com/hops/bcalc_js.html
OK my point is:
I've added the formulas to bugubrew and calculates for the following for data:
Batch size 45 litres, 1.051 OG, Hops: Centenial 9.5%AA 50g @ 60min ... and Bugubrew calculates 24.1 IBUs.
From Glenn Tinseth calculator (link above) calculates 24 IBUs.
Cool... Now !!
https://www.hopsteiner.com/ibu-calculator/ calculates 27.7 IBUs for Tinseth
BrewGr calculates 26.6 IBUs for Tinseth
https://www.brewersfriend.com/ibu-calculator/ calculates 27.51 'Based on Tinseth's equations.'
Application BrewMate calcs 25.74
It seems they are all different for the same calculation theory (Tinseth) using the same brew data. Why's that? Are they all wrong? .. or am I missing something?
I know IBUs is a 'relevant' number but what baffles me are the different results from different sources for the same formulas, making me doubt my own findings.
Hoping to be enlightened.
Some of you know I'm busy with bugubrew - which had me have a closer look at the formulas of calculating ibu's. There are several people with a different approach about what factors need to be considdered. The one I want to focus on in Tinseth - which seems to be a favourite to be referered to on the web when calculating ibu's.
I found a webpage edited/created/verified by Glenn Tinseth with his formulas on it:
https://realbeer.com/hops/research.html
More here:
https://www.realbeer.com/hops/FAQ.html#units
His simple calculator:
https://www.realbeer.com/hops/bcalc_js.html
OK my point is:
I've added the formulas to bugubrew and calculates for the following for data:
Batch size 45 litres, 1.051 OG, Hops: Centenial 9.5%AA 50g @ 60min ... and Bugubrew calculates 24.1 IBUs.
From Glenn Tinseth calculator (link above) calculates 24 IBUs.
Cool... Now !!
https://www.hopsteiner.com/ibu-calculator/ calculates 27.7 IBUs for Tinseth
BrewGr calculates 26.6 IBUs for Tinseth
https://www.brewersfriend.com/ibu-calculator/ calculates 27.51 'Based on Tinseth's equations.'
Application BrewMate calcs 25.74
It seems they are all different for the same calculation theory (Tinseth) using the same brew data. Why's that? Are they all wrong? .. or am I missing something?
I know IBUs is a 'relevant' number but what baffles me are the different results from different sources for the same formulas, making me doubt my own findings.
Hoping to be enlightened.
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