Priming Sugar Calculator

Priming Sugar for Bottle Conditioning

This priming sugar calculator estimates grams of sugar to carbonate homebrew before bottling. It uses beer style targets, batch volume, fermentation temperature, and sugar type. Also see our Homebrew ABV Calculator and Molecular SO₂ Calculator for other brewing math.

Target CO₂ by Style

Different beer styles need different carbonation. Stouts are often around 2.0 volumes of CO₂, ales and IPAs around 2.4, lagers around 2.6, and wheat beers up to about 2.8.

Residual CO₂ at Fermentation Temperature

Beer retains CO₂ from fermentation depending on temperature. The calculator estimates residual CO₂ (IC) in volumes using:

$$IC = 3.0378 - 0.050062 \times T + 0.00026555 \times T^2$$

where \(T\) is fermentation temperature in °F.

Priming Sugar Formula

Grams of priming sugar (PS) to reach your target final carbonation (FC):

$$PS = \frac{15.195 \times BV \times (FC - IC)}{S}$$

BV is beer volume in gallons. S is the sugar factor: table sugar 1.00, corn sugar 0.91, DME 0.68, honey 0.78.