Free Beer Priming Sugar Calculator
Calculate exact priming sugar weight in grams and ounces to achieve target carbonation volumes (CO2) without bottle gushers or exploded glass.
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⚖️ Priming Sugar Weight
Recommended Tools & Equipment
Tested hardware and components for high reliability
The Science of Bottle Conditioning & Henry's Law
Bottle conditioning relies on living yeast in fermented green beer consuming a precisely weighed dose of simple sugars. The yeast produces alcohol and carbon dioxide. Because the crown cap seals the bottle, the $CO_2$ has nowhere to escape and dissolves into solution according to Henry's Law.
Why Temperature Dictates Residual CO2
Gases dissolve more readily in cold liquids. Beer fermented at 60°F naturally retains approximately 0.95 volumes of dissolved CO2, whereas beer fermented warm at 75°F retains only 0.75 volumes. You must enter the highest temperature the beer reached post-fermentation so you do not over-prime and produce explosive "bottle bombs".
Table Sugar vs Corn Sugar
Table sugar (sucrose) is 100% fermentable. Brewing corn sugar (dextrose monohydrate) contains roughly 9% water of crystallization bound in its crystal lattice. Therefore, you need roughly 10% more corn sugar by weight to produce the exact same carbonation level as table sugar.
Frequently Asked Questions
What causes 'bottle bombs' in homebrewing?
Bottle bombs occur when beer is bottled before fermentation has 100% completed (residual unfermented wort sugars), or when priming sugar is accidentally overdosed or unevenly mixed in the bottling bucket.
How should I add priming sugar to my beer?
Dissolve the weighed sugar in 1 to 2 cups of boiling water for 5 minutes to sterilize it. Pour the hot syrup gently into your sanitized bottling bucket, then siphon your fermented beer on top so the swirling siphon motion mixes the sugar homogeneously without introducing splashing oxygen.
What carbonation level is safe for standard 12oz glass beer bottles?
Standard 12oz amber pry-off beer bottles are rated to withstand up to 3.0 volumes of CO2. Styles requiring higher carbonation (Belgian ales at 3.5+ vol) must be bottled in heavy Champagne-style bottles with corks and wire cages.