I added a second IBU calculator that uses Glenn Tinseth’s formula. One of the advantages of his method is that it is supposedly superior for full-wort boils. With a 10 gallon kettle, I’ve been doing full wort boils for some time, but my IBU numbers have been a little wacky, a little excessive. This should help things out.
The one thing I’m uncertain about is the utilization difference between whole hops and pellets. I accounted for the difference the Rager calculator. I’ve written Glenn Tinseth himself and hope he’s willing to shed some light. He knows much more about hops that I ever will.