How many calories are in homebrew?
About the same as the commercial equivalent, and for the same reasons. A beer's calories come from two things: the alcohol (roughly 7 kcal per gram) and the residual carbohydrate the yeast didn't ferment (4 kcal per gram). Both fall out of the two readings you already took. A 1.050 → 1.010 pale ale is about 163 kcal per 12 oz — 102 from alcohol, 61 from carbs, with 16 g of carbohydrate in the glass. The same beer is 217 kcal in a US pint, 229 in a half-liter, and about 8,700 kcal in the whole 5-gallon batch.
The method is the ASBC's (Methods of Analysis, "Caloric Content, Beer-33"), which every serious calculator uses in one form or another:
kcal per 100 mL = [6.9 × ABW + 4.0 × (RE − 0.1)] × FG
ABW = alcohol by weight; RE = real extract in °Plato (0.1808 × OE + 0.8192 × AE). Scale to your pour.
BeerSmith's popular pair of constants (1881.22 and 3550) is the same arithmetic with the Plato conversion folded in and Hall's ABV — it gives 99 + 59 = 158 kcal for a 1.048 → 1.010 beer against our 97 + 60 = 156. The difference is small compared with the uncertainty in this estimate.
Where the calories come from, style by style
| Beer | OG → FG | ABV | kcal / 12 oz | Alcohol | Carbs | Carbs (g) |
|---|---|---|---|---|---|---|
| Light lager | 1.036 → 1.006 | 3.9% | 116 | 77 | 40 | 10 |
| Pale ale | 1.050 → 1.010 | 5.3% | 163 | 102 | 61 | 16 |
| IPA | 1.065 → 1.012 | 7.0% | 211 | 135 | 76 | 19 |
| Sweet stout | 1.060 → 1.020 | 5.3% | 199 | 102 | 97 | 25 |
| Double IPA | 1.080 → 1.012 | 8.9% | 258 | 174 | 85 | 22 |
| Imperial stout | 1.100 → 1.026 | 9.7% | 328 | 189 | 140 | 35 |
Typical gravities for each style; ASBC method, from this page's engine. Per 12 US fl oz (355 mL).
Move the FG of a 1.050 beer from 1.008 to 1.012 and the total barely twitches — 162 vs 164 kcal — because every point the yeast leaves behind as carbohydrate is a point it didn't turn into alcohol, and the two are worth nearly the same. Move the OG and the total moves about 3.2 kcal for every gravity point. A lower-calorie beer is a smaller beer; a drier one is only a slightly different beer.
How many carbs are in beer — and what counts?
The calculator uses real extract as a carbohydrate proxy. Real extract includes residual sugars and dextrins, but also protein, minerals, and other dissolved material. Those are not all carbohydrates. The result is a homebrew estimate, not a laboratory nutrition analysis or a reliable basis for a commercial nutrition label. Read the ASBC definition of real extract for the distinction.
Lactose included in your original and final measurements contributes to the estimate already; do not add it a second time. Ingredients added after those readings need separate accounting. If they ferment, some sugar becomes alcohol and CO₂, so adding their original food-label calories directly to the finished beer is only a rough approximation.
Beer calorie chart by OG and FG
For a homebrew serving estimate: kcal per 12 oz across the range most beers land in. Multiply by 1.33 for a US pint, 1.41 for 500 mL, 0.93 for 330 mL.
| OG ↓ FG → | 1.006 | 1.008 | 1.010 | 1.012 | 1.015 | 1.020 |
|---|---|---|---|---|---|---|
| 1.030 | 97 | 98 | 99 | 100 | 102 | 104 |
| 1.035 | 113 | 114 | 115 | 116 | 118 | 120 |
| 1.040 | 129 | 130 | 131 | 132 | 134 | 136 |
| 1.045 | 145 | 146 | 147 | 148 | 149 | 152 |
| 1.050 | 161 | 162 | 163 | 164 | 165 | 168 |
| 1.055 | 177 | 178 | 179 | 180 | 181 | 184 |
| 1.060 | 192 | 193 | 194 | 195 | 197 | 199 |
| 1.065 | 208 | 209 | 210 | 211 | 213 | 215 |
| 1.070 | 224 | 225 | 226 | 227 | 229 | 231 |
| 1.075 | 240 | 241 | 242 | 243 | 244 | 247 |
| 1.080 | 255 | 256 | 257 | 258 | 260 | 263 |
| 1.085 | 271 | 272 | 273 | 274 | 276 | 278 |
| 1.090 | 287 | 288 | 289 | 290 | 291 | 294 |
kcal per 12 US fl oz. × 1.33 for a 16 oz pint, × 1.41 for 500 mL, × 0.93 for 330 mL, × 1.6 for an imperial pint. Ingredients included in OG and FG are already represented. Later additions need separate accounting; this is not a nutrition-label analysis.
How do you brew a lower-calorie beer?
Since calories track the OG, the honest answer is brew a smaller beer — a 1.040 session ale is 130 kcal where a 1.065 IPA is over 200, and no yeast trick closes that gap. Within a given OG you can shave a little: mash cooler (148°F / 64°C) and use a high-attenuating strain to push more extract into alcohol (which is still calories, just fewer per gram of original sugar), replace some malt with sugar or rice, and skip crystal malt and lactose. That is exactly how light lagers are made — low OG, adjuncts, sometimes an enzyme to ferment the dextrins — and it's why they taste the way they do. Pick the beer you want, then read the number.
Corrected October 10, 2026: Real extract is a carbohydrate proxy, not a nutrition analysis; ingredients already included in OG and FG must not be counted twice.