Is it the case that the recipe calculator doesn't correct for utilization according to the boil volume and gravity data? If so how can I correct this and future extract brews to hit my IBUs?
Boiling at gravity of 1.000 returns 40.3 units in the bitterness calculator, so the recipe calculator seems to be adjusting for utilization to return 28.7, but the formula would seem to be different to that in the bitterness calculator.
Correct, I have one smallish brew pot, and a large fermenter, hence the small boil and concern for blocking the utilization. Btw the brew is in the can as of yesterday, I only discovered the discrepancy after the fact.