Alcohol units calculator
Add what you drank (or plan to drink) to see the number of standard drinks, grams of pure alcohol, calories and the time to clear it.
Free, no sign-up, nothing stored
- Beer, can 320 ml (5%)1.3 standard drinks each1
- Beer, large bottle 620 ml (5%)2.4 standard drinks each0
- Wine, glass 150 ml (12%)1.4 standard drinks each0
- Spirits, shot 45 ml (40%)1.4 standard drinks each0
- Cocktail or whisky-soda (about 1.5 shots)2.1 standard drinks each0
- Thai whisky (Hong Thong, SangSom), 350 ml flask (35%)9.7 standard drinks each0
- Other drink
In total
1.3 standard drinks
- 13 g of pure alcohol
- about 88 kcal
Men: up to 2 a dayWithin the daily guideline
Women: up to 1 a dayAbove the daily guideline
A standard drink contains 10 g of pure alcohol. In Thailand, the Ministry of Public Health advises no more than 2 standard drinks a day for men and 1 for women, with alcohol-free days. The WHO notes that no level of drinking is risk-free.
In Thailand, the free 1413 line answers questions about alcohol and points you to help.
Estimated blood alcohol level
Estimated level now
0.00 g/L
Below the legal limit, by this estimate
Legal driving limit in Thailand: 0.5 g/L (0.2 g/L for drivers under 20 or on a provisional licence).
Statistical estimate (Widmark formula, elimination of 0.15 g/L per hour): the real value can differ by more than 30% depending on food, tiredness and medication. Never use it to decide whether to drive.
Alcohol units calculator
How it works
Grams of pure alcohol are calculated as: volume in ml × strength × 0.789 (the density of ethanol), divided by 100. A 330 ml can of 5% beer therefore holds 13 g, or 1.3 standard drinks; a large Thai 620 ml bottle, 24 g, almost 2.5 drinks.
The Thai and WHO “standard drink” is 10 g of pure alcohol; a UK unit is 8 g and a US standard drink 14 g. Drinks served in bars are often larger than these references.
The liver clears on average 1 standard drink per hour, a little less in women and lighter people. Coffee, a shower or sleep do not speed it up: only time does. In Thailand the legal driving limit is 0.5 g/l (0.2 g/l for drivers under 20 or without a full licence).
The calories shown count alcohol only (7 kcal per gram): sweet beers, cocktails and mixers add a lot more.
These tools give general information. They do not replace the advice of a doctor or a qualified professional.
Go furtherWeight & digestionFrequently asked questions
- How much is a 620 ml Thai beer?
- At 5%, about 24 g of pure alcohol, almost 2.5 standard drinks: on its own it exceeds the daily guideline for men.
- Are the guidelines the same for everyone?
- No. They are indicative for a healthy adult. During pregnancy, before driving, with certain medicines or liver disease, the only safe limit is zero.
- How long before I can drive?
- Allow at least one hour per standard drink after your last drink, plus a margin. After an evening of 5 drinks, the next morning can still be over the legal limit.
- Who can I contact if I worry about my drinking?
- Your doctor, or in Thailand the 1413 line (free, confidential), which points to support services, mainly in Thai.
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