Priming Sugar Calculator
Enter batch size, beer temperature, and desired carbonation to find sugar amount.
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Carbonation Levels by Style
| Style | CO2 Volumes | Notes |
|---|---|---|
| British Ale | 1.5–2.0 | Low carbonation, cask-like |
| American Ale / IPA | 2.2–2.6 | Standard |
| Wheat Beer | 2.8–3.5 | High carbonation |
| Belgian | 2.5–4.0 | Very high, use heavy bottles |
| Lager / Pilsner | 2.4–2.8 | Crisp carbonation |
How to Calculate Priming Sugar
Priming sugar is added at bottling time to create carbonation. The yeast ferments the sugar inside the sealed bottle, producing CO2 that dissolves into the beer.
The amount depends on your target carbonation level, the beer temperature (which determines residual CO2), and the type of sugar used. Corn sugar (dextrose) is the most common choice.
Carbonation levels are measured in volumes of CO2 (1 volume = 1L of CO2 dissolved per liter of beer at standard conditions). Style targets: 2.2–2.5 vol for American ales, 2.4–2.8 vol for wheat beers, 1.8–2.3 vol for British ales, 2.4–2.6 vol for lagers.
The calculator uses CO2 already dissolved in beer at conditioning temperature (beers retain residual CO2 based on temperature) and subtracts it from the target, then converts the remainder to priming sugar weight. Corn sugar (dextrose) yields roughly 0.91 volumes per ounce per gallon; table sugar (sucrose) yields slightly more.
Example: 5 gallons of ale conditioned at 68°F targeting 2.4 volumes. Residual CO2 at 68°F ≈ 0.85 volumes. Additional CO2 needed = 2.4 − 0.85 = 1.55 vol. Using corn sugar: (1.55 × 5) / 0.91 ≈ 8.5 oz (about 240g). Dissolve in 2 cups of boiling water, cool, and stir gently into the beer before bottling.
Always sanitize priming sugar solution. Use a consistent temperature reading — carbonation varies significantly: beer stored cold before bottling retains more CO2 and needs less priming sugar to avoid overcarbonation.
See also: ABV Calculator · Recipe Scaler