IBU Calculator

Free IBU calculator using the Tinseth formula. Add up to 3 hop additions for total and per-addition IBUs. American IPAs run 40-70 IBU.

IBU Calculator (Tinseth)

Batch Volume (gal)

Boil Gravity (OG)

Hop 1 Weight (oz)

Alpha Acid (%)

Boil Time (min)

Hop 2 Weight (oz)

Alpha Acid (%)

Boil Time (min)

Hop 3 Weight (oz)

Alpha Acid (%)

Boil Time (min)

Total IBUs

43.1

Hop 1 Contribution

34.5

Hop 2 Contribution

8.6

BU:GU Balance Ratio

0.86

ℹ️ Tinseth utilization: higher boil gravity lowers hop utilization, and additions after ~20 minutes contribute little measured bitterness. BU:GU near 0.5 is balanced; 0.8+ is firmly bitter.