Free Brewing Tool

IBU Calculator

Estimate the bitterness of your homebrew from hop additions. Supports multiple hops, Tinseth & Rager formulas, and BU:GU ratio.

IBU Calculator

International Bitterness Units

litres
L
1.030–1.110
Hop Additions1 hop
1
33.9 IBU
Weight
g
Alpha
%
Boil
m
204060800100+
Moderate
Total IBU
BU:GU0.68Balanced–malty
Tinseth formula
Tinseth: util = bigness × boilFactor · IBU = (g × α% × util × 1000) / L
🌿Multiple hop additions
⚗️Tinseth & Rager
⚖️BU:GU ratio
💾Saves your last values