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. Nobody's hydrometer can tell those apart.
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 carbohydrate figure is the real extract: everything still dissolved in the finished beer that isn't water or alcohol. Almost all of it is dextrins — chains of glucose too long for brewer's yeast to eat — plus a little unfermented sugar, protein and minerals. For a nutrition label that all counts as carbohydrate; for a low-carb or keto drinker it also all counts, because dextrins digest to glucose in you even though they didn't in the fermenter. Dry beers with high attenuation have fewer; sweet stouts, hazy IPAs and anything mashed hot have more.
It knows only what a hydrometer knows. Lactose in a milk stout is unfermentable and shows up in the FG, so it's counted — but at 4 kcal/g like any other carb, which is right. Fruit purée, honey or sugar added at packaging, or a fruit addition that partly fermented after your FG reading, are not counted. And priming sugar adds a few kcal per bottle before the yeast turns most of it into CO₂. For anything you added after the last reading, add its own calories on top.
Beer calorie chart by OG and FG
For labelling a tap list or a bottle: 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. Beer only — add lactose, fruit or sugar additions separately.
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.