Calculadora de Amargor IBU del Lúpulo (Tinseth y Rager)

Cómo funciona el cálculo

Every addition is scored with Tinseth utilisation. A bigness factor of 1.65 × 0.000125^(boil gravity − 1) penalises higher-gravity worts, a time factor of (1 − e^(−0.04 × minutes)) / 4.15 rewards longer boils, and the two multiply together with a form modifier to give utilisation. Bitterness is then alpha acid percentage times weight in grams times utilisation times 1000, divided by batch volume in litres. Each row shows its own utilisation figure so you can see where the bitterness is coming from.

Boil gravity, alpha acid percentage and boil time move the result hardest. At the default 1.050, a 60-minute pellet addition reaches about 23% utilisation, while the same hop at 15 minutes manages only 11%. Form matters too: pellets score 1.0, leaf hops 0.92, cryo 2.0, whirlpool additions are modelled as a fixed 15-minute boil equivalent regardless of the minutes you type, and dry hops contribute nothing. The BU:GU output divides total IBU by gravity points, so 1.050 counts as 50.

Tinseth is a model fitted to traditional boil-hopped beer and it drifts on modern recipes built around large late and whirlpool charges. The whirlpool option in particular is a single flat assumption — it takes no account of how hot your stand is or how long it runs — and the cryo modifier simply doubles utilisation, which will over-count if you have also entered the higher alpha acid figure printed on a cryo package. First-wort and mash hopping are not modelled, and measured IBUs from a lab rarely match any calculator exactly.

Preguntas frecuentes