Purpose: This calculator determines the volume of fermenting wort needed to achieve a desired level of carbonation.
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Kraeusening is a German practice of adding fermenting wort to the batch at bottling time for natural carbonation. This approach was once done by some Midwestern breweries such as Heileman's Old Style. For tips and further information, please see this resource from Braukaiser.
The calculations are based upon several assumptions. The first assumption is that the same wort will be used for both the main batch and the wort added at bottling time. A second assumption is that the main fermentation is 100% complete. The third assumption is for no extra pressure during fermentation (i.e., no spunding). Finally, there is no adjustment made for CO2 lost to headspace.
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