I'm not a big fan of the way whirlpool utilization is calculated at this time, as it's attempting to treat whirlpool with a different flat utilization value instead of treating it as a percentage of it's boil IBU for the same time period.
In many scenarios, especially at low time period, this can end up with a whirlpool addition providing more IBUs than a boil addition for the same time period, which is of course nonsense.
The system we have now, and all other brewing software use at this time, also assumes that boil additions magically stop isomerizing at t=0, providing zero additional ibus during a whirlpool process and only the hops listed as "whirlpool" add additional ibus...
A bit of light reading for an IMO, better model that I'm hoping we switch to at some point.
https://alchemyoverlord.wordpress.c...-ibu-measurement-especially-for-late-hopping/
Their online calculator can be seen here.
https://jphosom.github.io/alchemyoverlord/
With that said, all IBU formulas are very rough approximations. Tinseth for example had a 25-30% experimental uncertainty IIRC.
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