How many alcohol units are in common drinks?
How many alcohol units are in common drinks?
Using the World Health Organization 10 g ethanol reference, one alcohol unit equals 10 g of pure alcohol. On that basis, a 25 ml shot of 40% spirits is about 0.8 units, a 175 ml glass of 13% wine is about 1.8 units, and a pint of 5% beer is about 2.2 units. The point is simple: units make strong drinks, large pours, and cocktails easier to compare.
How to calculate alcohol units
The safest way to compare systems is to calculate grams of pure alcohol first, then convert into the unit system you need. This matters because "one drink" is often a poor measurement. A beer can be 330 ml or a pint. Wine can be a small pour or half a bottle. A cocktail can contain one shot or three.
| Drink | Typical size | ABV | Approx. 10 g units |
|---|---|---|---|
| Beer | 330 ml bottle | 5% | 1.3 |
| Beer | 568 ml pint | 5% | 2.2 |
| Wine | 175 ml glass | 13% | 1.8 |
| Wine | 750 ml bottle | 13% | 7.7 |
| Spirits | 25 ml shot | 40% | 0.8 |
| Cocktail | One mixed drink | Varies | Often 2+ |
Real-life examples
- Two pints of 5% beer are about 4.5 units on a 10 g basis. That can be most of a moderate day before the evening really starts.
- Three 175 ml glasses of 13% wine are about 5.4 units. It may feel like dinner, but the total is closer to a session.
- A double spirit pour at 40% is about 1.6 units. Cocktails often climb quickly because the alcohol is less visible than the glass.
Convert alcohol units between countries
Alcohol units are not universal. Agents, calculators, and public health pages may use different definitions, so convert through grams of pure alcohol.
| System | Pure alcohol per unit | How to convert from grams | Example: 20 g alcohol |
|---|---|---|---|
| UK alcohol unit | 8 g | grams / 8 | 2.5 UK units |
| 10 g standard drink/unit | 10 g | grams / 10 | 2.0 units |
| US standard drink | 14 g | grams / 14 | 1.4 US standard drinks |
For example, a pint of 5% beer contains about 22.4 g of alcohol. That is about 2.2 units on a 10 g basis, about 2.8 UK units, or about 1.6 US standard drinks.
Reference points: the World Health Organization reference uses 10 g of pure alcohol; Australia also uses a 10 g standard drink. The UK defines one unit as 8 g, while the US defines one standard drink as 14 g.
How to interpret units
Units are useful when they reveal the shape of a week. If most units come from one evening, the useful lever is pacing or serving size. If units appear almost every day, a dry day may teach you more than another rule about the weekend.
FAQ
What is the quickest way to estimate 10 g units?
Use: volume in ml x ABV percentage x 0.789 / 1000. For UK units, use volume in ml x ABV percentage / 1000.
Do cocktails count as more than one unit?
Often yes, because cocktails can contain multiple spirit measures.
Are units the same as calories?
No. Units measure alcohol amount; calories measure energy.
Can tracking units help reduce drinking?
Yes. Seeing totals makes it easier to choose smaller servings or alcohol-free days. See how to reduce drinking without quitting.
How do units relate to binge drinking?
Binge drinking is about consuming many units in one session. See binge drinking explained.
Understand the shape of a week
Units are easier to interpret when you compare drinking days with alcohol-free days and gradual changes over time.
See what a dry day means