Calculator
Beer calories estimator
How many calories are in a beer?
Beer calories come from two places — the alcohol and the sugar left unfermented — and alcohol supplies most of them in almost every beer. At around 7 kcal per gram, alcohol is nearly twice as energy-dense as carbohydrate, which is why a strong dry beer generally has more calories than a weak sweet one.
That is also why light and low-carb marketing is often misleading: reducing residual sugar changes the smaller of the two contributions. Any figure produced here is an estimate from gravity and strength, not a laboratory measurement, and it will not match a producer's own declared value exactly.
Result
- Beer calories estimator254 kcal
- From alcohol155 kcal
- From carbohydrate99 kcal
- Per 100 ml45 kcal
Working
kcal per 12 oz = 1881.22 × FG × ((OG − FG) ÷ (1.775 − OG)) + 3550 × FG × (0.1808 × OG + 0.8192 × FG − 1.0004)
| Step | Expression | Value |
|---|---|---|
| Calories from alcohol | first term | 96.8 kcal / 12 oz |
| Calories from carbohydrate | second term | 62.1 kcal / 12 oz |
| Per 12 US fl oz | sum of both terms | 159 kcal |
| Scaled to serving | 159 ÷ 355 × 568 | 254 kcal |
What it means
Roughly two-thirds of the calories in a typical beer come from the alcohol rather than from carbohydrate, which is why "light" beers reduce strength rather than sugar.
Worked example
The example above starts from these values. It is rendered on the server, so the formula, assumptions and limitations are all present whether or not you change anything.
- Result254 kcal
- From alcohol155 kcal
- From carbohydrate99 kcal
- Per 100 ml45 kcal
Inputs
| Volume | 568 ml |
|---|---|
| Original gravity | 1.048 |
| Final gravity | 1.011 |
How it is calculated
kcal per 12 oz = 1881.22 × FG × ((OG − FG) ÷ (1.775 − OG)) + 3550 × FG × (0.1808 × OG + 0.8192 × FG − 1.0004)
What each term means
| OG | Original gravity |
|---|---|
| FG | Final gravity |
| First term | Energy from ethanol |
| Second term | Energy from residual carbohydrate |
Step by step
| Step | Expression | Value |
|---|---|---|
| Calories from alcohol | first term | 96.8 kcal / 12 oz |
| Calories from carbohydrate | second term | 62.1 kcal / 12 oz |
| Per 12 US fl oz | sum of both terms | 159 kcal |
| Scaled to serving | 159 ÷ 355 × 568 | 254 kcal |
What this assumes
- The beer contains no post-fermentation additions such as lactose, fruit syrup or sweeteners.
- Final gravity is the true terminal gravity.
Where it stops being reliable
- An estimate from gravity, not a measurement. Declared nutritional values come from laboratory analysis and will differ.
- Colour tells you nothing about calories — they track alcohol and residual sugar. A dry stout at 4.2% has fewer calories than most pale beers of similar strength.
- Beers with added lactose or fruit will read low, since those sugars are not captured by the gravity drop.
What the number means
Roughly two-thirds of the calories in a typical beer come from the alcohol rather than from carbohydrate, which is why "light" beers reduce strength rather than sugar.
Empirical approximation. A curve fitted to measured data. It has real error bars, and it is frequently quoted as though it were exact.
Sources: Energy conversion factors — alcohol 7 kcal/g, carbohydrate 4 kcal/g — from Regulation (EU) No 1169/2011, Annex XIV, read on legislation.gov.uk.
Not traced to a source: Deriving real extract from original and final gravity.
This shows how much alcohol is in a drink. It cannot tell you how alcohol affects you, and it must not be used to judge whether you are fit to drive. Drink-drive limits are enforced on measured blood or breath alcohol, and how quickly a person processes alcohol varies with body composition, food, medication and other factors no calculator can see.