BrewnWKopperKat
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And there are details in the The IBU is a LIE! Kind of..... article as to the lab that they used, pricing (as of 2017), ...
Help with calculating the average boil gravity
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VikeMan
It ain't all burritos and strippers, my friend.
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Which calculator are you using? Link?
prankster1590
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It's this one: IBU Calculator Beer Bitterness - Brewer's Friend
I think I know whats wrong. It takes the postboil volume as being 1.0477 in all cases.
BrewnWKopperKat
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I'll see if I can find the BBR podcast when they did the lab measurement of Hop Sampler IBUs. It's interesting that, over time, they ended up using something similar to (if the the same as) HBUs (AA x weight) for as a numerical value for bitterness.
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VikeMan
It ain't all burritos and strippers, my friend.
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Ok. That calculator is giving you an "Estimated Boil Gravity" (the answer in green at the bottom) which is the gravity you would need at your specified pre-boil size in order to reach the "Target Original Gravity" specified at the specified post-boil size.
Personally, I would have labeled it with something more clear.
