Enter your batch volume, fermentation temperature, and desired CO₂ volumes to find exactly how much priming sugar you need at bottling time. The Priming Sugar Calculator accounts for residual CO₂ already dissolved in your beer and returns results for corn sugar (dextrose), table sugar (sucrose), DME, and honey — in grams, ounces, and cups.
Priming Sugar Needed (grams)
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Amount in Ounces
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Amount in Cups
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Residual CO₂ in Beer
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CO₂ to Add via Priming
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Priming sugar is a small, measured amount of fermentable sugar added to your beer just before bottling. The residual yeast in the beer ferments this sugar, producing CO₂ that carbonates the beer inside the sealed bottle. This process is called bottle conditioning or bottle priming.
CO₂ dissolves into liquid more readily at lower temperatures. The highest temperature your beer reached during or after fermentation determines how much residual CO₂ is already dissolved in the beer. A warmer fermentation leaves less residual CO₂, so you'll need slightly more priming sugar. Always use the highest post-fermentation temperature for accuracy.
Yes. The same carbonation chemistry applies to mead and cider. Simply enter your batch volume, liquid temperature, and target CO₂ volumes (typically 2.5–3.0 vols for cider, 2.5–2.8 vols for mead) and choose your preferred sugar type. Honey is a popular priming agent for mead.
Corn sugar (dextrose) is 100% fermentable and the most common priming choice — it's reliable and flavour-neutral. Table sugar (sucrose) is also fully fermentable but is slightly denser, so you need a marginally smaller weight. Both work well; the calculator adjusts the amounts automatically based on each sugar's CO₂ yield.
Carbonation targets vary by style. English ales and stouts typically aim for 1.7–2.2 volumes, American ales for 2.3–2.6 volumes, Belgian ales and wheat beers for 2.8–3.5 volumes, and ciders or sparkling meads for 2.5–3.0 volumes. The style presets in this calculator set the recommended target automatically.
Residual CO₂ is the CO₂ that naturally dissolves into beer during fermentation. It never fully off-gasses and varies with fermentation temperature. This calculator automatically subtracts the residual CO₂ from your target, so it only tells you how much additional CO₂ your priming sugar needs to contribute — you won't over-carbonate.
Too much sugar can over-carbonate the beer, leading to excessive foam, gushing bottles, or in extreme cases bottle bombs — dangerously over-pressurised bottles that can shatter. Too little sugar results in flat, under-carbonated beer. Always measure by weight (grams or ounces) rather than volume for the most consistent results.
Most ales carbonate fully within 2–3 weeks at room temperature (65–72°F / 18–22°C). Lagers and high-gravity beers may need 3–4 weeks or longer. After conditioning, refrigerate the bottles to help CO₂ stay in solution and allow any sediment to settle before serving.