Corn Sugar vs Table Sugar for Priming Beer: Weights & Cost
Both sugars ferment out completely and both carbonate beer identically. The only thing that changes is how much you weigh out, because the two sugars release different amounts of CO2 per gram. The chemistry is fixed. Sucrose (C12H22O11, MW 342.30) hydrolyzes and ferments to 4 CO2, releasing 176.04 ÷ 342.30 = 0.514 g CO2 per gram. The corn sugar sold in US homebrew shops is dextrose monohydrate (C6H12O6·H2O, MW 198.17), which ferments to 2 CO2 for 88.02 ÷ 198.17 = 0.444 g CO2 per gram — about 9.1% of its weight is water of crystallization that produces nothing. Dividing gives the conversion: table sugar = 0.444 ÷ 0.514 = 0.86× the corn-sugar weight. The widely repeated "0.91×" figure comes from extract equivalence — dextrose monohydrate is rated 42 ppg against sucrose’s 46, and 42 ÷ 46 = 0.91. That corrects only for the 9.1% water of crystallization and ignores the fact that a gram of glucose solids yields 5% less CO2 than a gram of sucrose (0.489 vs 0.514). Apply both corrections — 0.913 × 0.951 — and you get 0.87, the same 0.86 the stoichiometry gives directly. If your corn sugar came from a homebrew shop in a 1 lb bag, use 0.86. Run the same 2.5 oz through both sugars and you get 0.85 volumes from corn sugar against 0.98 from table sugar — a ratio of 0.87. Everything below is worked at one standard target — 5.0 US gallons (18.93 L) at 2.5 volumes of CO2, with beer that finished at 68°F and therefore already holds 0.85 volumes of residual CO2.
| Factor | Corn Sugar (Dextrose) | Table Sugar (Sucrose) |
|---|---|---|
| Weight needed for identical carbonation | Baseline, 1.00×. Dextrose monohydrate releases 0.444 g CO2 per gram (88.02 g CO2 per 198.17 g sugar). | 0.86× the corn-sugar weight. Sucrose releases 0.514 g CO2 per gram (176.04 g CO2 per 342.30 g sugar). Use 0.95× only if your dextrose is labeled anhydrous. |
| Grams for 5 gal at 2.5 volumes CO2 | 138 g (4.87 oz). Math: 2.5 − 0.85 residual = 1.65 volumes needed; 1.65 × 1.96 g/L × 18.93 L = 61.2 g CO2; 61.2 ÷ 0.444 = 138 g. | 119 g (4.20 oz). Same 61.2 g CO2 target: 61.2 ÷ 0.514 = 119 g. That is 19 grams less sugar for exactly the same fizz — a 14% difference you cannot eyeball. |
| Flavor contribution to the finished beer | None detectable at priming scale. 138 g in 18.93 L is 7.3 g/L, roughly 5% of a typical 5-gallon batch’s total fermentables (about 7% of the fermentable extract), and it ferments to dryness. | None detectable. 119 g is 6.3 g/L. Both sugars leave zero residual extract, so neither adds body, sweetness, or a distinguishable character at this dose. |
| Fermentation speed by bottle yeast | Glucose enters the cell directly through hexose transporters — no preprocessing step at all. | One extra step that costs no measurable time. Yeast secretes invertase into the periplasm, splitting sucrose into glucose and fructose before uptake. Both finish inside the same 14–21 days at 68–72°F. |
| The "cidery flavor" myth | Corn sugar earned its default status in 1970s US homebrew literature, not from any measured advantage. | The cidery reputation traces to 1980s "kit and a kilo" recipes where stale canned hopped extract — not the sugar — carried the off-flavor, and where sugar was 20%+ of fermentables. Priming sugar is roughly 5% of a typical 5-gallon batch’s total fermentables (about 7% of the fermentable extract). Green-apple acetaldehyde comes from underpitching and warm fermentation, not from sucrose. |
| What blind tasting actually shows | Dextrose, 8 preference votes. | Sucrose, 10 preference votes. Brülosophy’s 2019 triangle test used 2.375 lb of each sugar in a 5-gallon Belgian Golden Strong — roughly 8× a priming dose. 18 of 30 tasters identified the odd sample (15 needed for p<0.05; actual p=0.002), but preference split nearly evenly. Both finished at 9.8% ABV. |
| Cost per batch and availability | About $0.91–$1.06 per batch (roughly $0.98 at the midpoint). Homebrew dextrose runs $2.99–$3.49 per 1 lb bag; 138 g is 0.30 lb. Requires a homebrew shop or an online order. | About $0.27 per batch. US retail granulated sugar averaged $1.03/lb in May 2026; 119 g is 0.26 lb. The $0.71 gap is 1.3 cents across the 53 twelve-ounce bottles a 5-gallon batch fills — and it is already in your kitchen at 11 p.m. on bottling day. |
| Dissolving and handling | Less soluble — about 91 g per 100 mL of water at 25°C. Dextrose monohydrate is the stable, free-flowing form and is not especially hygroscopic; anhydrous dextrose is the one that pulls moisture from the air and cakes. Either will clump if stored damp — reseal the bag. | More soluble — about 204 g per 100 mL at 20°C. Neither is limited in practice: 138 g boiled into 2 cups (473 mL) of water is only 29 g/100 mL, well under both ceilings. Boil either for 5 minutes to sanitize, cool, then stir into the bottling bucket. |
| Measuring by cups (the real error source) | One cup of dextrose weighs roughly 142–160 g because the crystals are coarse and pack loosely. | One cup of granulated sucrose weighs about 200 g. Substituting cup-for-cup instead of weight-for-weight delivers 45–65% more CO2 than you targeted — the actual cause of most gushers and bottle bombs blamed on "switching sugars." Use a scale that reads to 1 g. |
| Monohydrate vs anhydrous caveat | Assume monohydrate unless the bag says otherwise. Its 9.1% water (18.02 g per 198.17 g) is dead weight, so anhydrous dextrose needs only 125 g where monohydrate needs 138 g — a 10% difference. | No equivalent ambiguity. Granulated sucrose is a single anhydrous form at 99.9%+ purity, so 119 g is 119 g regardless of brand, bag, or country of origin. |
Our Verdict
Both work. Neither will ruin your beer, and no blind taster is going to catch a 19-gram difference in sugar type across 53 bottles. Table sugar is the more practical default for most homebrewers: it costs about 70 cents less per batch, it is already in your pantry, and it has no monohydrate ambiguity — 119 g of granulated sugar is 119 g of granulated sugar no matter whose bag it came from. Corn sugar’s only genuine edge is inertia: nearly every published recipe and bottling instruction is written in dextrose weights, so using it means you can follow directions without converting. The single requirement is adjusting the weight. Multiply the corn-sugar figure by 0.86 for monohydrate dextrose, or 0.95 if your bag specifies anhydrous. Do not substitute by volume — a cup of sucrose outweighs a cup of dextrose by 40–60 g, and that mistake is what actually produces gushers. Your exact number depends on batch size, target volumes, and the temperature your beer finished at, since residual CO2 swings from about 1.2 volumes at 50°F down to 0.75 at 78°F. Run your own numbers in the priming sugar calculator rather than borrowing a chart figure, and use the ABV calculator if you want to account for the roughly 0.4% ABV that priming adds.