New answers tagged extract-brewing
The alpha acids that give the bitterness from hops reach saturation somewhere around 90 IBUs. Since your hops were not exposed to the whole volume of beer (presumably they were filtered out at the of the boil) you aren't getting the full impact from them. It is reasonable to say that the IPA is actually 90 IBUs (saturation is around 90mg/L). Then divide by ...
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