🍯 Priming Sugar Calculator
Enter your beer volume, the carbonation you want, and the beer's temperature to get the exact grams of corn or table sugar to prime with — no flat bottles, no gushers.
🍯 Calculate Priming Sugar
What is a Priming Sugar Calculator?
It tells you exactly how much sugar to add before bottling so your beer carbonates to the level you want. The yeast eats that sugar in the sealed bottle, producing CO₂ that dissolves into the beer — too little and it's flat, too much and you get gushers or broken glass.
Enter your batch volume, target carbonation in volumes of CO₂, and the beer's temperature, and the calculator accounts for the CO₂ already dissolved before giving you a precise weight of corn or table sugar. It takes the guesswork — and the risk — out of bottle conditioning.
❓ Frequently Asked Questions
How does the priming sugar calculator work?
It first works out how much CO₂ is already dissolved in your beer from its temperature, since warm beer holds less gas. It subtracts that residual CO₂ from your target carbonation, multiplies by your beer volume, and scales by the CO₂-per-gram of your chosen sugar to give the exact grams of corn or table sugar to add at bottling.
Why does beer temperature matter for priming?
Carbon dioxide is more soluble in cold liquid, so a cold beer already holds more residual CO₂ and needs less priming sugar, while a warm beer holds less and needs more. The tool uses the highest temperature your beer reached during conditioning — usually near the end of fermentation — because that sets how much CO₂ remains dissolved.
What's the difference between corn sugar and table sugar?
Corn sugar (dextrose) is the homebrew standard; table sugar (sucrose) yields slightly more CO₂ per gram, so you need about 9% less of it for the same carbonation. This calculator converts automatically — pick your sugar and it gives the matching weight. Both ferment cleanly, so use whichever you have on hand.
How many volumes of CO₂ should I target?
It depends on style: British ales and stouts are often 1.5–2.2 volumes, American ales and lagers around 2.2–2.7, and wheat beers or Belgians can run 3.0–4.5. Over-priming risks gushers or exploding bottles, so stay within your bottles' pressure rating and err on the lower side if unsure.