Brewing Calculators

Calculated Dosage Rates for Downstream Products

Looking for more information on how to brew with downstream products? The following calculators offer a quick way for you to formulate your recipe calculations and learn more about the most important statistics for your brews.

CO2 Extract

GmAA = IBU x (BBL/0.8522)
            3.5*

Explanation

GmAA = grams of alpha acids to be added in the brew kettle

IBU = the desired amount of bitterness units from the addition

BBL = barrels of finished beer

*Use rates may vary depending on the brewing process and the desired hopping level. If you would like to change the efficiency from 35%, adjust the 3.5 in the equation. 32% efficiency will change this value to 3.2 and 38% efficiency will adjust to 3.8.

Homebrewers - if you are making a batch less than 1 barrel, you will need to divide the number of gallons by 31. The resulting decimal will be placed into the BBL box for calculations.

Example:
5 gallons/31 gallons = 0.161 BBL

Isomerized Hop Extract

Dosage = BU x 0.360
           0.80*

Explanation

Dosage = milliliters of IAA to be added per BBL of beer post fermentation

BU = is the desired amount of bitterness units imparted by ISO 

*Use rates may vary depending on the brewing process and the desired hopping level. If you would like to change the efficiency from 80%, adjust the 0.80 in the equation. 75% efficiency will change this value to 0.75 and 85% efficiency will adjust to 0.85.

Homebrewers - if you are making a batch less than 1 barrel, you will need to fill in the box with the desired BUs. Then you need to divide the dosage by 31 gallons and multiply by the number of gallons you are brewing. 

Example:
5 gallon batch and desire 
17 BUs from IHE: Dosage = 7.65mL/31 gallons = 0.247mL/gal x 5 gal = 1.23mL

Tetrahydro Isomerized Hop Extract

Dosage = BU x 0.680
           0.70*

Explanation

Dosage = milliliters of THIAA to be added per BBL of beer

BU = is the desired amount of bitterness units imparted by Tetra

*Use rates may vary depending on the brewing process and the desired hopping level. If you would like to change the efficiency from 70%, adjust the 0.70 in the equation. 75% efficiency will change this value to 0.75 and 65% efficiency will adjust to 0.65.

Homebrewers - if you are making a batch less than 1 barrel, you will need to fill in the box with the desired BUs. Then you need to divide the dosage by 31 gallons and multiply by the number of gallons you are brewing. 

Example:
5 gallon batch and desire 20 BUs from Tetra: Dosage = 19.43mL/31 gallons= 0.627mL/gal. x 5 gal = 3.13mL

Reduced Kettle Extract (Post-Fermentation Use)

Dosage = BU x 0.520
           0.70*

Explanation

Dosage = milliliters of Rho-IAA to be added per BBL of beer

BU = is the desired amount of bitterness units imparted by RKE

*Use rates may vary depending on the brewing process and the desired hopping level. If you would like to change the efficiency from 70%, adjust the 0.70 in the equation. 75% efficiency will change this value to 0.75 and 65% efficiency will adjust to 0.65.

Homebrewers - if you are making a batch less than 1 barrel, you will need to fill in the box with the desired BUs. Then you need to divide the dosage by 31 gallons and multiply by the number of gallons you are brewing. 

Example:
5 gallon batch and desire 10 BUs from RKE: Dosage = 7.43mL/=31 gallons= 0.240mL/gal x 5 gal = 1.20mL