I brewed a NE IPA a month ago. I added a small bittering charge at FWH and the rest all at FO and WP @150 for 30 min. The IBU calculated for the batch was 35 (used BF). There were some IBU's that were contributed during the WP, maybe 10-15. The FO hops contributed zero. The first batch barely had any bitterness so I would have to assume the estimated 35 IBU's were actually under 30. With my next batch I plan on increasing total IBU's to 45. Question: Why does FO additions show zero IBU's but WP additions show IBU's? I entered the same recipe in BF and BS and changed the hops around. The FWH in BF shows 29 and BS shows 44 or 49 (cant remember the exact amt). Any insight as to why there would be a large difference between the different software? The only thing I can see is maybe the equipment profile may be a little different between the two. I'll have to verify when I get home but if it is different it isn't by much. Also, when calculating WP additions what is the best utilization percentage to use?