search

danielgtaylor / malt.io

Malt.io free community for brewers
26 stars 11 forks source link

IBU calculation off #74

Open ibrewaletx opened 11 years ago

ibrewaletx commented 11 years ago

Noticed when importing a recipe that a 45 minute addition of 5% Willamette hops in a 3 gallon batch only showed 9 IBU's instead of ~17.
http://www.malt.io/users/jlkeeney/recipes/mildly-mild

danielgtaylor commented 11 years ago

How are you calculating 17 IBU? Malt.io uses the Tinseth formula and takes into account hop form, average boil volume, boil duration, alpha acid percentage and sugar content in the boil. The formula in use is listed on this page: http://www.malt.io/homebrew-formulas

Brauhaus.js, a component of the next version of the Malt.io recipe calculator, will allow you to choose multiple formulas as a property of the recipe. Right now Tinseth and Rager are implemented, with the option of adding more in the future. I'd be curious to know what formula you used originally and whether this is a common one that should be supported.