Hi, can someone please explain this discrepancy to me?
Recipe Design
Batch Size: 11 gallon
Pre-boil Vol: 14.95
Pre-boil Gravity: 1.084
Est. OG: 1.114
Trub Loss: 0 gallons
5 oz EKG, 10%, 60 min: 63.5 IBU
Hop Bitterness Tool
Batch Vol: 11 gallons
Boil Vol: 14.95 gallons
Boil Gravity: 1.084
5 oz EKG, 10%, 60 min: 63.4 IBU
Tinseth Javascript Tool (http://www.realbeer.com/hops/bcalc_js.html)
Wort Gravity: 1.074
Final Volume: 11 gallons
1st Hop: 5oz, 10%. 60 min: 63 IBU
I got BeerSmith to agree on IBU assuming the Hop Bitterness Tool's Original Gravity means pre-boil gravity. However, the utilization is way off from the Tinseth tool. The Tinseth tool is asking for overall "Boil Gravity" which I take to mean the average gravity during the boil. The only way I can get the Tinseth tool to agree, is to plug in a pre-boil gravity of 1.074. Given the parameters above, the average gravity should be 1.099 (not 1.074) during a 60 minute boil. Putting 1.099 into the Tinseth tool gives me 51 IBUS. This is more than 10 IBUs off from BeerSmith.
Can someone please tell me what I'm doing wrong?!
Recipe Design
Batch Size: 11 gallon
Pre-boil Vol: 14.95
Pre-boil Gravity: 1.084
Est. OG: 1.114
Trub Loss: 0 gallons
5 oz EKG, 10%, 60 min: 63.5 IBU
Hop Bitterness Tool
Batch Vol: 11 gallons
Boil Vol: 14.95 gallons
Boil Gravity: 1.084
5 oz EKG, 10%, 60 min: 63.4 IBU
Tinseth Javascript Tool (http://www.realbeer.com/hops/bcalc_js.html)
Wort Gravity: 1.074
Final Volume: 11 gallons
1st Hop: 5oz, 10%. 60 min: 63 IBU
I got BeerSmith to agree on IBU assuming the Hop Bitterness Tool's Original Gravity means pre-boil gravity. However, the utilization is way off from the Tinseth tool. The Tinseth tool is asking for overall "Boil Gravity" which I take to mean the average gravity during the boil. The only way I can get the Tinseth tool to agree, is to plug in a pre-boil gravity of 1.074. Given the parameters above, the average gravity should be 1.099 (not 1.074) during a 60 minute boil. Putting 1.099 into the Tinseth tool gives me 51 IBUS. This is more than 10 IBUs off from BeerSmith.
Can someone please tell me what I'm doing wrong?!