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Calcimator

Hop Utilization Calculator

Calculate IBU contributions using the Tinseth formula based on hop weight, alpha acid, boil time, and wort gravity.

Inputs

oz
%
min
gallons
SG

Results

IBU

20.7

Hop Utilization23.1%
Alpha Acid Units6 AAU
How to Use This Calculator
  1. Enter hop weight (oz or g), alpha acid percentage, and boil time in minutes.
  2. Set batch volume (gallons) and wort gravity (SG) at time of hop addition.
  3. Review IBU, Hop Utilization (%), and Alpha Acid Units.
  4. Adjust boil time or hop weight to hit your target bitterness level.

How the result changes with Wort Gravity

Wort GravityIBU
1.0129.7
1.0422.7
1.0815.8
1.1112.1

What each input means

Hop Weight
Weight of the hop addition in ounces.
Alpha Acid
Alpha acid percentage of the hops. Check the package or supplier specs. Ranges from 2% (noble) to 20%+ (super alpha).
Boil Time
Minutes the hops will boil. Longer boil = more bitterness, less hop flavor/aroma.
Batch Volume
Final batch volume in gallons. Post-boil volume into the fermenter.
Wort Gravity
Specific gravity of the wort. Higher gravity reduces hop utilization. Enter as decimal (e.g., 1.050).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Hop Weight = 1, Alpha Acid = 6, Boil Time = 60, Batch Volume = 5 = 5 input(s) provided
  2. Calculate IBU
    IBU = ibuAtTime
    20.7 = 20.7
  3. Calculate Hop Utilization
    Hop Utilization
    23.1 = 23.1
  4. Calculate Alpha Acid Units
    6 = 6

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