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Whirlpool & mIBU

What does a hop stand actually contribute? This models the bitterness of whirlpool, hop-stand and flameout additions from the real isomerization chemistry — the measured temperature kinetics, not a flat fudge — so you can see how steeply the payoff falls as the wort cools, and design a late charge that lands where you want it.

MalowickiMeasured kinetics

TinsethAnchored magnitude

CooldownModeled, not guessed

iso-αWhat it predicts

The wort

Batch & kettle

Units

Batch volume (gal) Average boil gravity The mean kettle gravity; iso-α solubility falls as it rises. Boil bitterness model Sets boil additions only; whirlpool always uses the kinetics.

Whirlpool / chiller cooldown

Your hop additions

The schedule

Add boil, flameout and whirlpool charges. Boil additions take minutes; whirlpool additions take the stand temperature and time. Alpha is yours to set from the package — these defaults are nothing, fill in your own.

Whirlpool & mIBU · A brewer's calculator

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Measured kinetics · verified

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Whirlpool & mIBU

Batch & kettle

The schedule

Explore a hop stand

Solve for hops