Standard Drink Calculator
Convert any alcoholic beverage to standard drinks and track your alcohol consumption
DRINK RESPONSIBLY
Understanding standard drinks helps you make informed decisions about alcohol consumption.
- Know your limits and adhere to legal drinking age requirements
- Never drink and drive - plan ahead for a safe ride home
- If you're concerned about your drinking, seek professional help
- This calculator is for educational purposes only
What is a Standard Drink?
In the United States, one standard drink contains approximately 14 grams (0.6 ounces) of pure alcohol.
This typically equals:
- 112 ounces of regular beer (5% ABV)
- 25 ounces of wine (12% ABV)
- 31.5 ounces of distilled spirits (40% ABV)
However, different drinks can vary widely in alcohol content. Craft beers, large pours, and mixed drinks often contain more than one standard drink, even if they look like a single serving.
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Why Counting Standard Drinks Matters
Health Monitoring
Tracking standard drinks helps you stay within recommended limits and reduce health risks associated with excessive alcohol consumption, including liver disease, heart problems, and certain cancers.
Accurate Tracking
Different alcoholic beverages have widely varying alcohol content. A pint of craft beer may equal 2-3 standard drinks, while a large glass of wine might be 1.5-2 drinks.
Blood Alcohol Content
Knowing your standard drink intake helps estimate BAC levels. Remember that even one drink can impair judgment and coordination, and it's illegal to drive with a BAC of 0.08% or higher in all states.
Calorie Awareness
Alcohol contains 7 calories per gram. A standard drink has approximately 100-150 calories. Mixed drinks with sugary additives can contain significantly more.
Frequently Asked Questions
How do different countries define standard drinks?
Definitions vary internationally. The UK uses "units" (8g alcohol), Australia uses 10g, while Japan defines it as 19.75g. This calculator uses the US standard of 14g pure alcohol. Always check local guidelines when traveling.
Is light beer really lower in standard drinks?
Light beer typically has 4.2% ABV compared to 5% for regular beer, so a 12oz light beer is about 0.85 standard drinks versus 1.0 for regular beer. However, the difference is relatively small, and drinking more light beers to compensate can result in equal or higher alcohol consumption.
How long does alcohol stay in your system?
The liver metabolizes alcohol at approximately one standard drink per hour, but this varies based on weight, gender, age, and individual metabolism. Nothing can speed this process up - coffee, cold showers, and sleep don't affect BAC. The only thing that reduces BAC is time.
Can I drink if I'm taking medications?
Alcohol can interact dangerously with many medications, including antibiotics, antidepressants, pain relievers, and blood pressure medications. Always check with your pharmacist or doctor about potential interactions. Even some herbal supplements can interact with alcohol.
What are the signs of alcohol problems?
Warning signs include drinking more or longer than intended, inability to cut down, cravings, neglecting responsibilities, continued use despite problems, and developing tolerance or withdrawal symptoms. If you're concerned about your drinking, consult your healthcare provider or call the SAMHSA National Helpline at 1-800-662-HELP.
Drinking Guidelines
Moderate Drinking (CDC)
Up to 1 drink/day for women, up to 2 drinks/day for men
Heavy Drinking (CDC)
8+ drinks/week for women, 15+ drinks/week for men
Binge Drinking (CDC)
4+ drinks on one occasion for women, 5+ for men
Note: These guidelines are for adults of legal drinking age. Certain individuals should not drink at all, including pregnant women, people under 21, those with certain medical conditions, and people taking medications that interact with alcohol.
Disclaimer: Disclaimer: This calculator is for educational purposes only. If you're concerned about your alcohol consumption, please consult a healthcare professional.
For help with alcohol-related concerns, call the SAMHSA National Helpline: 1-800-662-HELP (4357)
A standard drink is a fixed quantity of pure alcohol, and the point of the unit is that it lets very different drinks be compared. It is also the source of a persistent misunderstanding: a standard drink is not a glass, a bottle or a can. A pint of strong craft beer can contain three standard drinks, which is why people who count glasses routinely underestimate their intake by a factor of two or more.
The formula
Standard drinks = volume (mL) x ABV (%) / 100 / mL of pure alcohol per standard drink
US: 17.7 mL (14 g) per standard drink
UK unit: 10 mL (8 g) per unit- volume = the amount of the drink in millilitres
- ABV = alcohol by volume, the percentage printed on the label
- Countries define the standard differently, which is why the same drink converts to different numbers
US definition from the National Institute on Alcohol Abuse and Alcoholism: 14 grams of pure alcohol. The UK unit is 8 grams. Definitions elsewhere range from about 8 to 20 grams.
What counts as one standard drink
The US equivalents below all contain about 14 grams of pure alcohol. They look nothing alike, which is the point of the unit.
- A 16 fl oz pint of 7 percent IPA contains about 2.2 US standard drinks, not one.
- A generous restaurant pour of wine is often 6 to 9 fl oz, which is 1.2 to 1.8 standard drinks rather than one.
- Home pours of spirits are typically larger than 1.5 fl oz, frequently by a factor of two.
| Drink | Volume | Typical ABV |
|---|---|---|
| Regular beer | 12 fl oz (355 mL) | 5% |
| Malt liquor | 8 to 9 fl oz (250 mL) | 7% |
| Table wine | 5 fl oz (148 mL) | 12% |
| Fortified wine (sherry, port) | 3 to 4 fl oz (100 mL) | 17% |
| Distilled spirits, 80 proof | 1.5 fl oz (44 mL) | 40% |
Elimination is not exponential
Alcohol differs from most substances in that it is eliminated at an approximately constant rate rather than a constant fraction. Once the metabolising enzymes are saturated, which happens at very low blood concentrations, clearance follows zero-order kinetics: roughly one standard drink per hour in an average adult, regardless of how much has been consumed.
This has a consequence people frequently get wrong. Doubling the amount drunk more than doubles the time to sober, because the body cannot speed up. Nothing accelerates it, and the popular remedies do not touch the rate: coffee counteracts drowsiness without changing blood alcohol, cold showers do nothing, and eating slows absorption if done beforehand but does not increase elimination afterwards.
- Only time lowers blood alcohol concentration. Coffee, showers, exercise and food do not.
- Food eaten before or during drinking slows absorption and lowers the peak, which is a real effect, but it does not change how long clearance takes.
Drinking level definitions
The categories below are the NIAAA definitions used in US research and public health guidance. They exist to make risk comparable across studies rather than to mark a safe amount, and current guidance from several bodies notes that less is better and that no level is entirely without risk.
| Category | Men | Women |
|---|---|---|
| Moderate drinking | 2 drinks or fewer per day | 1 drink or fewer per day |
| Binge drinking | 5 or more drinks in about 2 hours | 4 or more drinks in about 2 hours |
| Heavy drinking | 5 or more on any day, or 15+ per week | 4 or more on any day, or 8+ per week |
Limitations
- Standard drink definitions differ by country. A US standard drink is 14 grams of alcohol, a UK unit is 8 grams, and other countries range from roughly 8 to 20 grams, so the same drink converts differently.
- The one-drink-per-hour elimination figure is an average. Actual rate varies with sex, body composition, liver function, genetics and regular intake.
- The calculator estimates alcohol consumed, not blood alcohol concentration, which additionally depends on body water, sex, stomach contents and time course.
- Nothing here should be used to judge fitness to drive. Legal limits are defined on measured blood or breath concentration, and impairment begins below every legal limit.
- Alcohol interacts dangerously with many medications, and the categories above assume no such interaction.
- These definitions are for healthy non-pregnant adults. No amount is considered safe in pregnancy.
Frequently asked questions
What counts as one standard drink?
In the US, any drink containing about 14 grams of pure alcohol: a 12 oz regular beer at 5 percent, a 5 oz glass of table wine at 12 percent, or 1.5 oz of 80-proof spirits. The UK unit is smaller at 8 grams.
How long does it take to sober up?
Roughly one standard drink per hour, because alcohol is eliminated at an approximately constant rate rather than a constant fraction. Doubling the amount consumed more than doubles the time, and nothing speeds the process up.
Does coffee help you sober up?
No. Caffeine counteracts drowsiness without changing blood alcohol concentration, which can make someone feel more capable while remaining equally impaired. Only time lowers blood alcohol.
Why does a pint of craft beer count as more than one drink?
Because a standard drink is a quantity of alcohol, not a serving size. A 16 oz pint at 7 percent ABV contains about 2.2 US standard drinks, compared with one for a 12 oz beer at 5 percent.
How much drinking counts as binge drinking?
The NIAAA defines it as 5 or more drinks for men, or 4 or more for women, within about two hours, which is the pattern that typically brings blood alcohol to 0.08 percent.