Standard Drink Calculator - Country-Specific Standard Drinks
Use this standard drink calculator to convert any drink by ABV and volume into US, UK, Australia, or Japan standard drinks, with grams and calories.
Standard Drink Calculator
Results
What Is a Standard Drink Calculator?
A standard drink calculator turns any drink's volume and ABV into a country-specific count of standard drinks, then shows the underlying grams and calories of pure alcohol. The result is a quick way to compare a 12 oz 5 percent lager, a 5 oz wine pour, and a 1.5 oz spirit pour against your country's standard.
- • Translate between US, UK, Australia, and Japan: switch the country standard to see the same drink counted against 14 g, 8 g, 10 g, or 20 g.
- • Estimate session totals: log how many drinks you had to scale the per-drink count into a session total.
- • Verify a label or restaurant claim: use a known bottle or can to check what a 5 oz wine pour or 1.5 oz shot contains.
- • Plan alcohol calories: read the calorie line so you can fit the drink into a maintenance or deficit budget.
The most common confusion is that a 'standard drink' is not a single global unit. According to the International Alliance for Responsible Drinking, a standard drink contains 8 g of pure alcohol in the UK and Iceland, 10 g in Australia, France, Spain, and New Zealand, 12 g in Germany, 13.6 g in Canada, 14 g in the US, and 20 g in Japan and Austria, so the same drink counts for very different totals depending on where you are.
If you live in the UK and want the same drink translated into 8 g UK units, the alcohol units calculator runs the calculation with the NHS unit definition.
How the Standard Drink Calculator Works
The math is the same for every country: convert the drink's alcohol volume into grams of pure ethanol, then divide by the country-specific standard drink weight. The country selector swaps the denominator so the same inputs work against 11 country definitions.
- Volume (mL): Volume of the alcohol-bearing portion in millilitres. A 12 oz beer is about 355 mL, a 5 oz wine pour is 148 mL, a 1.5 oz spirit shot is 44.36 mL, and a 25 mL cocktail spirit pour stays at 25 mL even when topped with mixer in the glass.
- ABV (%): Alcohol by volume of the alcohol-bearing portion, from the label or menu. Beers sit between 3 and 8 percent, wines between 11 and 14 percent, and spirits at about 40 percent.
- Country standard (g): Grams of pure ethanol that count as one standard drink, ranging from 8 g in the UK to 20 g in Japan and Austria.
- Ethanol density (g/mL): Density of pure ethanol at 20 degrees Celsius, which is 0.789 g/mL according to the NIST Chemistry WebBook.
Switching from US 14 g to Japan 20 g roughly halves the headline number for the same drink, while switching to UK 8 g roughly doubles it.
US 12 oz 5 percent lager
Volume = 355 mL, ABV = 5 percent, Country = US (14 g).
Pure alcohol = 355 x 0.05 x 0.789 = 14.0 g. Standard drinks = 14.0 / 14 = 1.0. Calories = 14.0 x 7 = 98 kcal.
Standard drinks = 1.0, pure alcohol = 14.0 g, alcohol calories = 98 kcal.
A 12 oz US lager is exactly one US standard drink.
175 mL 12 percent wine, UK and Japan
Volume = 175 mL, ABV = 12 percent, servings = 1.
Pure alcohol = 175 x 0.12 x 0.789 = 16.6 g. UK drinks = 16.6 / 8 = 2.07. Japan drinks = 16.6 / 20 = 0.83.
Standard drinks = 2.07 (UK) or 0.83 (Japan), alcohol calories = 116 kcal per glass.
The same 175 mL glass of wine counts for 2.07 UK units or 0.83 Japanese standard drinks.
According to US NIAAA, one US standard drink contains 14 grams of pure alcohol, which equals a 12 oz 5 percent beer, a 5 oz 12 percent wine, or a 1.5 oz 40 percent spirit.
According to IARD, a standard drink contains 8 g in the UK and Iceland, 10 g in Australia, France, Spain, and New Zealand, 12 g in Germany, 13.6 g in Canada, 14 g in the US, and 20 g in Japan and Austria.
To see how the same evening maps to a blood alcohol percentage from drinks, weight, gender, and time, the BAC calculator turns the standard drink total into an estimated BAC.
Key Concepts Explained
Four short definitions make the rest of the page easier to follow, especially the difference between US, UK, Australian, and Japanese standard drinks.
Standard drink
A country-specific measure of pure alcohol. The US uses 14 g, the UK and Iceland use 8 g, Australia, France, Spain, and New Zealand use 10 g, Germany uses 12 g, Canada uses 13.6 g, and Japan and Austria use 20 g.
ABV (alcohol by volume)
The percentage of the drink's volume that is pure alcohol. A higher ABV means more pure alcohol per millilitre.
Pure alcohol density
Pure ethanol has a density of 0.789 g/mL at 20 degrees Celsius, the constant used to convert an alcohol volume into grams of pure alcohol.
Alcohol calories
Pure alcohol provides about 7 kcal (29 kJ) per gram, so the calorie load of a drink is proportional to its alcohol content rather than its total liquid volume.
These four ideas feed every output the calculator shows.
If you want alcohol calories slotted into a full daily energy budget, the calorie calculator adds the alcohol-only kcal to your other meals and snacks.
How to Use This Standard Drink Calculator
The calculator runs all of its math for you, so the only work is to type the drink's volume and ABV, pick a country, and enter the servings you had.
- 1 Name the drink: Type a short label such as "12 oz lager" or "175 mL wine pour".
- 2 Pick a country standard: Choose the country whose standard drink weight you want, and switch it to compare the same drink against US, UK, Australian, or Japanese standards.
- 3 Enter the actual volume: A 12 oz beer is 355 mL, a 5 oz wine pour is 148 mL, and a 1.5 oz spirit shot is 44.36 mL. For a mixed drink, enter the spirit's volume only, since mixers add no alcohol.
- 4 Enter the ABV: Beers sit between 3 and 8 percent, wines between 11 and 14 percent, and spirits at 40 percent.
- 5 Log the serving count: Type how many of these drinks you actually had so the session total scales the per-drink result.
- 6 Read the result panel: The result panel shows the standard drink count for the selected country, the session total, grams and mL of pure alcohol, and the alcohol-only calories.
If you log a 12 oz 5 percent lager with the US country picker and one serving, the result panel shows 1.0 US standard drink, 14.0 g of pure alcohol, and 98 kcal. Change the country to Japan (20 g) and the headline drops to 0.7 standard drinks; raise the serving count to 3 and the session total becomes 3.0 US standard drinks or 2.1 Japanese standard drinks.
Benefits of Using This Standard Drink Calculator
A standard drink calculator helps you replace rough mental counts with measured totals that line up with your country's published guidance.
- • Replaces guessing with measured totals: you see the actual standard drink count, more useful than counting glasses of mixed shapes.
- • Compares countries without redoing the math: the country picker translates the same drink into 11 country definitions.
- • Highlights session totals in context: the session total scales the per-drink result, so a night can be compared with the 14 US drinks per week men or 14 UK units NHS guideline.
- • Pairs cleanly with calorie and BAC tools: alcohol calories and grams feed straight into a maintenance calorie or BAC calculation.
When you want to know whether alcohol calories fit your maintenance budget before the night starts, the maintenance calorie calculator gives the daily energy target the alcohol number has to fit inside.
Factors That Affect Your Results
The math is stable, but the inputs are not, so five factors drive the visible result.
ABV accuracy
A 1 percent ABV difference changes the standard drink count proportionally. A 12 percent wine logged as 13 percent adds about 8 percent more standard drinks.
Glass and can size
A 125 mL wine pour, a 148 mL 5 oz pour, and a 175 mL large glass change the same bottle's standard drink count by roughly 40 percent, so enter the actual poured volume.
Mixers and dilution
Mixers do not add alcohol, only volume and flavour. A 25 mL spirit shot at 40 percent ABV topped with 100 mL of tonic still contains the same 7.9 g of pure alcohol, so for a mixed drink enter the spirit's volume and ABV, not the total cocktail volume.
Country standard drink weight
A 175 mL 12 percent wine pour counts as 1.18 US standard drinks, 2.07 UK units, 1.66 Australian standard drinks, and 0.83 Japanese standard drinks, so the country picker is the biggest lever on the headline number.
Home pours and tolerance
Home-poured spirits and restaurant wine pours can vary by 10 to 30 percent from the labelled size, so treat the result as a planning estimate.
- • The calculator assumes the labelled ABV is correct and the poured volume matches what you typed, so trust the label or measure the pour with a jigger.
- • The calorie output counts only the alcohol itself, not sugars, mixers, or food pairings; add mixer calories separately for a full energy number.
According to UK NHS, pure alcohol provides about 7 kcal (29 kJ) per gram, so the calorie load of a drink is proportional to its alcohol content rather than its total liquid volume.
For a quick weekly view of how alcohol calories compare with the rest of what you eat and drink, the simple calorie intake calculator sums the alcohol line with your food entries for the same week.
Frequently Asked Questions
Q: What counts as one standard drink of alcohol?
A: A standard drink is a country-specific measure of pure ethanol. The US National Institute on Alcohol Abuse and Alcoholism defines one US standard drink as 14 grams of pure alcohol, which equals a 12 ounce regular beer at 5 percent ABV, a 5 ounce glass of wine at 12 percent ABV, or a 1.5 ounce shot of distilled spirits at 40 percent ABV. Other countries use a different weight, which is why the calculator asks you to pick one.
Q: How many standard drinks are in a 750 mL bottle of wine?
A: A 750 mL bottle of 12 percent wine contains about 71 grams of pure alcohol, which is 5.07 US standard drinks, 8.88 UK units, 7.10 Australian standard drinks, or 3.55 Japanese standard drinks. The exact number changes with the wine's ABV, with a 14 percent bottle climbing to 5.92 US standard drinks for the same 750 mL volume.
Q: How do I calculate standard drinks from ABV and volume?
A: Multiply the drink's volume in mL by its ABV expressed as a decimal, then multiply by 0.789 g/mL to convert the alcohol volume into grams of pure ethanol. Divide the result by the country-specific standard drink weight (14 g in the US, 8 g in the UK, 10 g in Australia, 20 g in Japan) to get the standard drink count. The calculator does this for you as soon as you change a value.
Q: Why is one US standard drink 14 grams and the UK only 8 grams?
A: The US and UK use different denominators on purpose. The US adopted 14 g of pure alcohol per standard drink in the 1980s and 1990s when the modern dietary guidelines were written, while the UK set its alcohol unit at 8 g of pure alcohol in 1987 so that a small glass of lower-strength wine would round to one unit. The result is that the same 175 mL 12 percent wine counts for 1.18 US standard drinks but 2.07 UK units, so a guideline from another country is not directly comparable without conversion.
Q: How accurate is a standard drink calculator for home pours?
A: The calculation is exact for the ABV and volume you enter, but real-world accuracy depends on the label ABV being correct and your poured volume matching what you typed. Home-poured spirits and restaurant wine pours can vary by 10 to 30 percent from the labelled size, so treat the result as a planning estimate rather than a precise figure, and use a jigger for spirits when the number matters.
Q: How many standard drinks per week is considered low risk?
A: Low-risk weekly limits differ by country. The US Dietary Guidelines define moderate drinking as up to 1 standard drink per day for women and up to 2 standard drinks per day for men, which sums to 7 and 14 US standard drinks per week respectively. The UK NHS advises men and women not to drink more than 14 UK units per week, the Australian National Health and Medical Research Council recommends no more than 10 Australian standard drinks per week, and Japan's Ministry of Health sets a daily limit of about 2 Japanese standard drinks for the general population. The calculator outputs the per-drink and session total so you can compare against the right country's guideline.