Brewing with extract and looking at IBU calculations, not sure if I'm doing it right.
6 lbs DME @ 43 ppg boiled with 1.5 gallons. I have minimal loss, so final boiled volume is within a tenth of starting volume.
Boiled OG: 1.172?
1 oz 7.1% @ 60 min
1 oz 7.4% @ 20 min
1 oz 6.2% @ 5 min
1 oz 6.2% @ flame out
Plugging that in to brewersfriend I get 67.7 wort IBU, diluted to 5 gallons gives me a final IBU of 19.5.
Does that look like I'm in the ballpark?