Tinseth IBU Calculator

This page provides a calculator for predicting IBUs using the Tinseth formula. This formula is provided on Glenn Tinseth's web site. He has a similar JavaScript IBU calculator.

Inputs:

Input Units: metric or U.S. customary (e.g. gallons, ounces)

Wort:
Boil Time (minutes):
Evaporation Rate (G/hr):
Wort Volume (G): pre-boil or post-boil volume
(Post-Boil) Original Gravity:
Wort/Trub Left in Kettle (G): (only needed for partial boils)
(Partial Boil) Added Water (G):

Hops:
Number of Hop Additions:
Global IBU Scaling Factor:

Outputs:


Save and Load:

Save to File:
Load from File:

Note that the Tinseth utilization function models alpha acid isomerization as a pseudo first-order reaction, with no utilization at a boil time of zero minutes and the rate of utilization greatest at lower boil times. This generally conforms to the utilization function later determined by Mark Malowicki (adviser Tom Shellhammer).

utilization


Versions:

1.0.0: (2017-Jan-06) Initial version.
1.0.1: (2018-May-06) Added functionality for partial boils, global scaling, and evaporation rate.
1.2.0: (2018-Jul-15) Complete re-write under the hood. Add boil time. Minor fixes. New functionality: automatically save and load parameter settings.
1.2.2: (2018-Sep-03) Minor updates.
1.2.3: (2018-Dec-29) Minor updates.
1.2.4: (2020-Feb-21) Add ability to save and load files.
1.2.5: (2021-Nov-25) Minor updates.

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Copyright © 2018-2021 John-Paul Hosom, all rights reserved. While I hope that you find this page useful, I make no guarantees about the accuracy or suitability of the results. Predicting IBUs is a bit of a "black art", because there are so many variables and there is so much variability. The only way to really know the IBU level of a beer is to have it professionally tested, which is something I highly recommend. Cheers!