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General Homebrew Discussion / Calculating IBUs
« on: August 13, 2010, 07:16:18 pm »
We have been shifting from developing our beer recipes on hopville to calculating them ourselves. Since we have been doing this we have been hitting our targets almost exactly but cant figure out if the IBUs are correct. We are working on a 5.5 gallon Belgian Dubbel recipe and according to Hopville the IBU's are 23.5, using 3 oz. Stryian Goldings 5.2AA, 1oz each at 60, 45 and 30. When calculating it on our own we are coming up with 52.684 IBUs using a HOP UTILIZATION(HU) of:
(oz x AA x HU) / (final volume x 1.34 [constant # from Joy of Hombrewing?])
60min = 30% (1 x 5.4% x 30%) / (5.5 x 1.34) = 21.98
45min = 24% (1 x 5.4% x 24%) / (5.5 x 1.34) = 17.584
30min = 18% (1 x 5.4% x 18%) / (5.5 x 1.34) = 13.12
= 52.684IBUs
What are we doing wrong?
(oz x AA x HU) / (final volume x 1.34 [constant # from Joy of Hombrewing?])
60min = 30% (1 x 5.4% x 30%) / (5.5 x 1.34) = 21.98
45min = 24% (1 x 5.4% x 24%) / (5.5 x 1.34) = 17.584
30min = 18% (1 x 5.4% x 18%) / (5.5 x 1.34) = 13.12
= 52.684IBUs
What are we doing wrong?


, but seemed to vanish off the market soon after. Had to pick up a 6 pack just for fun, not that great. Does anybody know what happened to them? is this a big comeback like Schlitz and others like them?
