Beersmith hop utilization backwards?

[zach1288]

If you increase the batch volume in Beersmith(5g to 6g) and the gravity decreases(1.054 to 1.045), the IBU's also decrease(35.3 to 31.7)?

This is backwards correct? Everything I have read said that higher gravity decreases hop utilization and visa versa. Can someone clear this up for me?

 

[AnthonyC]

If you're dealing with the same amount of hops going into a larger batch your IBUs will necessarily decrease unless you increase the amount of hops. Changing your batch size just adjusts your sparge water all things being equal.

 

[Sardoman]

That is true if the gravity of the same volume is lower. By increasing the volume, you are diluting the bitterness.