Alcohol Units Calculator
Convert drinks to UK units, US standard drinks, and Australian standard drinks. Calculates alcohol grams, calories, estimated BAC, and weekly risk assessment.
Standard Drink Calculator — Alcohol Content Converter
Convert any alcoholic beverage to standard drinks (US, UK, AU, CA). Calculate pure alcohol grams, calories, metabolism time, and compare 15+ common drink types.
Drink Specification
Standard Drinks (US)⧉
1
1 US standard = 14 g alcohol
Pure Alcohol⧉
14 g
17.7 mL ethanol
Alcohol Calories⧉
98 kcal
~127 kcal total (est.)
Metabolism Time⧉
~1 h
At ~1 standard drink / hour
Binge Risk⧉
No
NIAAA binge threshold
Total Volume⧉
355 mL
1 × 12 oz
Common Drinks Comparison
| Drink | ABV | Serving | Std Drinks | Calories* |
|---|---|---|---|---|
| Regular beer (5%) | 5% | 12 oz | 1.0 | 98 |
| Light beer (4.2%) | 4.2% | 12 oz | 0.8 | 82 |
| Craft IPA (7%) | 7% | 16 oz | 1.9 | 183 |
| Strong ale (9%) | 9% | 12 oz | 1.8 | 176 |
| Wine (12%) | 12% | 5 oz | 1.0 | 98 |
| Fortified wine (18%) | 18% | 3 oz | 0.9 | 88 |
| Champagne (12%) | 12% | 5 oz | 1.0 | 98 |
| Vodka/gin/rum (40%) | 40% | 1.5 oz | 1.0 | 98 |
| Whiskey (43%) | 43% | 1.5 oz | 1.1 | 105 |
| Cask strength (58%) | 58% | 1.5 oz | 1.5 | 142 |
| Hard seltzer (5%) | 5% | 12 oz | 1.0 | 98 |
| Malt liquor (8%) | 8% | 12 oz | 1.6 | 157 |
| Sake (15%) | 15% | 5 oz | 1.3 | 123 |
| Margarita (typical) | 13% | 8 oz | 1.7 | 170 |
| Long Island Iced Tea | 22% | 8 oz | 2.9 | 287 |
* Alcohol calories only. Beer/wine/cocktails contain additional calories from carbohydrates.
Standard Drink by Country
| Country | Grams per Std Drink | Your Count |
|---|---|---|
| 🇺🇸 United States | 14 g | 1 |
| 🇬🇧 United Kingdom | 8 g (1 unit) | 1.75 |
| 🇦🇺 Australia | 10 g | 1.4 |
| 🇨🇦 Canada | 13.45 g | 1.04 |
| 🇯🇵 Japan | 19.75 g | 0.71 |
Planning notes, formulas, and examples
About the Standard Drink Calculator — Alcohol Content Converter
A "standard drink" is a fixed amount of pure alcohol, but the definition varies dramatically by country — 14 grams in the US, 8 grams in the UK, 10 grams in Australia. Many popular drinks contain far more alcohol than one standard drink: a 16-oz craft IPA at 7% ABV contains nearly 2 US standard drinks, and a typical Long Island Iced Tea exceeds 3. Misunderstanding serving sizes is a leading cause of unintentional overconsumption.
This calculator converts any beverage by ABV and volume into standard-drink equivalents for multiple countries, grams of pure alcohol, alcohol-only calories, and rough metabolism-time context. It includes common drink presets for quick comparison, from light beer to cask-strength whiskey to cocktails, to make the alcohol content easier to compare across serving styles.
Understanding standard drinks is useful for tracking consumption against health-guideline language, recognizing binge-drinking thresholds, estimating rough sobriety timing, and making informed decisions about alcohol's caloric and health impact.
When This Page Helps
Most people dramatically underestimate their alcohol consumption because they think in "drinks" (one glass, one bottle) rather than standard units. A large wine pour is 1.5-2 standard drinks. A craft beer tallboy is nearly 2. This calculator removes the guesswork, revealing the actual alcohol content so you can make informed decisions about health, driving, and compliance with medical guidelines.
How to Use the Inputs
- Select a preset drink or enter custom ABV (%) and volume (oz) for your beverage.
- Enter the number of servings consumed.
- Review the standard drink count (US and international equivalents).
- Check alcohol grams, calories, estimated metabolism time, and binge risk status.
- Compare with the common drinks table to understand relative alcohol content across beverages.
Formula used
Alcohol (mL) = Volume (oz) × 29.5735 × ABV/100
Alcohol (grams) = Alcohol (mL) × 0.789 g/mL
US Standard Drinks = Alcohol (grams) / 14
UK Units = Alcohol (grams) / 8
Calories from alcohol = grams × 7 kcal/gExample Calculation
Result: 3.74 US standard drinks, 52.4 g pure alcohol, 367 kcal
Two pints of 7% IPA: 32 oz × 29.57 mL/oz × 0.07 ABV × 0.789 g/mL = 52.4 g alcohol. At 14 g per US standard drink, that is 3.74 standard drinks — nearly double what most people assume for "two beers." At 7 kcal/g, the alcohol alone contributes 367 calories.
Tips & Best Practices
- Restaurant wine pours (6-8 oz) are typically 1.2-1.6 standard drinks — significantly more than the 5 oz (1 standard drink) used in guidelines.
- Cocktails vary wildly: a simple gin & tonic is ~1 standard drink, while a Long Island Iced Tea can be 3-4.
- When tracking weekly intake, count in standard drinks, not "glasses" — accuracy matters for health assessment.
- Alcohol has nearly twice the calories per gram as carbs or protein (7 vs 4 kcal/g) — a significant factor in weight management.
- Recent Canadian guidance (≤ 2 drinks/week for minimal risk) reflects a more cautious framing around alcohol and cancer/chronic disease risk.
Standard Drink Basics
A standard drink is a fixed amount of pure alcohol, not a fixed glass size. The exact definition varies by country, so the same beverage can map to different drink counts depending on the guideline used.
Why This Calculator Helps
Serving sizes, craft-beer strength, and cocktail recipes often hide how much alcohol is actually present. Converting to grams and standard-drink equivalents makes comparisons easier.
Practical Limits
Standard-drink estimates are useful for planning and comparison, but they do not measure intoxication or impairment by themselves. BAC, timing, food, body size, and individual metabolism all affect how alcohol feels and how long it stays in the body.
Sources & Methodology
Last updated:
Methodology
This worksheet converts beverage volume and alcohol by volume into grams of pure alcohol, then expresses that amount as U.S. and international standard drinks. It is a comparison aid, not a measure of intoxication or a diagnosis of alcohol misuse.
Sources
- What Is a Standard Drink? (NIAAA) — Official U.S. standard-drink definition and examples.
- Alcohol Metabolism (NIAAA) — Official alcohol-absorption and metabolism reference.
- Understanding Binge Drinking (NIAAA) — Official binge-drinking threshold and standard-drink context.
Frequently Asked Questions
Each country chose its standard independently based on different public health traditions. The US (14g) based its standard on typical beer/wine/spirit serving sizes. The UK (8g) chose a smaller unit for easier arithmetic. Australia (10g) and most of Europe use 10g for simplicity. Japan uses 19.75g.
Alcohol itself provides 7 kcal/g, making one US standard drink (14g) = 98 calories from alcohol alone. Beer and wine add carbohydrate calories (a 12-oz beer is ~150-200 total calories). Spirits with zero-sugar mixers have only alcohol calories (~100 kcal per shot).
NIAAA defines binge drinking as 4+ standard drinks for women or 5+ for men within about 2 hours. This typically raises BAC to 0.08% or above. However, even 3 drinks can impair judgment and coordination. Binge drinking is the most harmful drinking pattern.
The average person metabolizes approximately one standard drink per hour (range: 0.75–1.5 drinks/hour). This rate is essentially constant regardless of body size or tolerance. Three standard drinks take about 3 hours. Coffee, cold showers, and exercise do not speed this up.
No. A regular 12-oz, 5% beer is approximately 1 standard drink. But a 16-oz craft IPA at 7% is 1.87 standard drinks. A 22-oz bomber of 9% stout is 3.3 standard drinks. A 40-oz malt liquor at 8% is 5.3 standard drinks. Always check ABV and volume.
US NIAAA: ≤ 2 drinks/day for men, ≤ 1 for women, and no more than 14/week (men) or 7/week (women). Recent Canadian guidance uses a much lower threshold of ≤ 2 drinks/week for minimal risk. UK guidance uses ≤ 14 units/week. Any amount of alcohol carries some health risk.
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