Standard Drink Calculator

What is a standard drink?

A US standard drink contains 14 grams (0.6 fluid ounces) of pure ethanol. NIAAA and the Dietary Guidelines for Americans use this unit so beer, wine, and spirits can be compared regardless of beverage type.

People underestimate intake without that unit. A pint of craft beer at 7% ABV is nearly two standard drinks. A restaurant wine pour may hold 8 to 10 ounces, approaching two drinks.

NIAAA lists typical equivalents: 12 ounces of regular beer at about 5% ABV, 5 ounces of table wine at about 12% ABV, or 1.5 ounces of 40% distilled spirits. Malt liquor and oversized cans often hold more alcohol than a single beer appears to. Moderate drinking in US guidelines means up to one standard drink per day for women and up to two for men. Those are upper limits for low risk, not advice to drink every day.

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Calculating standard drinks

Formula: Standard drinks = (volume in ounces × ABV% × 0.789) ÷ 14. The factor 0.789 converts fluid ounces of beverage to grams of ethanol based on alcohol density.

Example: 12 oz beer at 5% ABV yields (12 × 5 × 0.789) / 14, about 1.0 standard drink. A 16 oz pint at 6% ABV yields about 1.4 standard drinks. Enter volume in fluid ounces and ABV percentage. For mixed drinks, calculate each alcoholic component separately and sum.

ABV on labels reflects average content. Craft batches and barrel-proof spirits can run higher than listed. When in doubt, round up.

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Standard drinks in common beverages

Regular beer (12 oz, 5%): 1 drink. Craft IPA (12 oz, 7%): about 1.4 drinks. Wine (5 oz, 12%): 1 drink. Restaurant pour (8 oz, 13%): roughly 1.7 drinks. Spirits (1.5 oz shot, 40%): 1 drink. Strong cocktails may contain 3 to 4 standard drinks in one glass when multiple shots are poured.

A 750 mL bottle of 12% wine holds about five standard drinks. A 40 oz malt liquor at 7% ABV can exceed four standard drinks in one container.

Weekly standard-drink totals show patterns that glass counts hide.

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Conversion table for common containers

Use the label rather than the beverage name. Light beer can have nearly the same ABV as regular beer, and one cocktail may contain several measured pours. The general metric formula is standard drinks = volume in milliliters × ABV as a decimal × 0.789 g/mL ÷ 14 g. For US fluid ounces, multiply ounces by 29.5735 before applying that formula. The earlier shortcut must treat ABV as a decimal; using 5 instead of 0.05 creates a result one hundred times too large.

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Worked drink-count examples

| Example | Calculation | Result | | --- | --- | --- | | 16 oz beer at 7% | 16 × 29.5735 × 0.07 × 0.789 ÷ 14 | 1.87 drinks | | 8 oz wine at 13% | 8 × 29.5735 × 0.13 × 0.789 ÷ 14 | 1.74 drinks | | Cocktail with two 1.5 oz pours at 40% | 3 × 29.5735 × 0.40 × 0.789 ÷ 14 | 2.00 drinks |

Round only after adding all components. If a punch recipe contains 750 mL of 40% spirits and makes ten equal servings, the spirits contribute about 1.69 standard drinks per serving before wine or liqueur is counted. Ice and mixers change total beverage volume but not ethanol grams. When the pour or ABV is uncertain, record a plausible low and high estimate instead of a precise answer built from guessed inputs.

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Counting exposure is not a diagnosis

A standard-drink total describes ethanol exposure. It does not diagnose alcohol use disorder or predict a specific BAC. Diagnosis considers impaired control, craving, hazardous use, continued use despite harm, tolerance, and withdrawal during a twelve-month period. A person can have a dangerous binge without meeting diagnostic criteria, and a person with alcohol use disorder may report a low total during a short period of attempted control.

Clinicians use quantity and frequency questions to screen, then assess symptoms, medications, pregnancy, liver disease, and withdrawal history. NIAAA defines binge drinking by a pattern that typically reaches 0.08% BAC, often four drinks for women or five for men in about two hours. These are population guideposts, not guaranteed thresholds. Smaller bodies, rapid consumption, interacting drugs, and older age can increase harm at lower counts.

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How to use your drink count

Record the container, serving size, ABV, start time, and number consumed on the same day. Add a separate row for each alcoholic ingredient in a mixed drink. Review both the weekly total and the largest single-day total because averaging can hide concentrated drinking. Use the result to plan smaller containers, lower-ABV choices, alcohol-free days, water and food, and transportation that does not depend on a calculated BAC. People who do not drink should not start for a health benefit.

Do not drink during pregnancy, before driving, with opioids or other sedatives, or when a clinician has advised abstinence. Call emergency services for slow or irregular breathing, seizures, repeated vomiting with reduced alertness, or inability to wake. A person who drinks heavily most days and has tremor, sweating, hallucinations, seizures, or prior severe withdrawal should seek medical help before stopping abruptly. Counting supports a clinical conversation but cannot make withdrawal safe.

For a household bottle, mark the starting level or measure pours instead of estimating at the end of the night. A kitchen scale can improve recipe estimates: weigh the alcoholic ingredient, convert with its density only when the product volume is unavailable, and retain the label ABV. When reviewing a week, note the reason for each drinking occasion and whether the planned limit changed. That record helps identify large containers, social refills, and high-strength products that contribute more than expected. Share the log with a clinician if sleep, blood pressure, mood, stomach symptoms, or attempts to cut down are concerns.

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Health guidelines and risks

NIAAA defines low-risk drinking as no more than 3 drinks on any single day and no more than 7 per week for women, and no more than 4 drinks on any day and 14 per week for men. Exceeding either the daily or weekly limit raises injury, liver disease, and cancer risk. Binge drinking, typically four or more drinks for women or five or more for men in about two hours, drives a large share of alcohol-related harm even when weekly totals look moderate.

No level of alcohol consumption is completely safe for cancer risk.

Ethanol is linked to breast, colorectal, liver, and head and neck cancers. Pregnant women, people under 21, those on interacting medications, and anyone with alcohol use disorder should not drink. CDC notes that excessive drinking contributes to more than 140,000 US deaths each year from liver disease, heart disease, and injuries. Counting standard drinks lets you compare your pattern to NIAAA low-risk limits.

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Limitations

Homemade cocktails and punch bowls require estimating component volumes and ABV. Keg parties and generous pours vary widely. UK and Australian units use different ethanol amounts (8 g and 10 g respectively). This calculator uses the US 14-gram standard drink only.

Standard drink counts support self-monitoring and clinical conversations. They do not predict BAC.

If you are pregnant, might become pregnant, or take sedating medications, NIAAA advises avoiding alcohol entirely rather than estimating drinks. The calculation is only as accurate as the inputs. Foam, leftover liquid, shared pitchers, free-poured spirits, refills, and drinks accepted from someone else can make volume uncertain. Label ABV may describe the packaged beverage but not a cocktail assembled from several products. Absorption and impairment are outside the formula, so two people with the same standard-drink count can have different BAC curves and symptoms. Calories are also separate: ethanol supplies about 7 kilocalories per gram, while sugar, cream, and mixers add more. Use a range when serving size is uncertain and keep the original observations so a clinician can interpret the estimate.

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How it works

Standard drinks = (volume × ABV% × 0.789) / 14 grams ethanol per drink.

Frequently asked questions

• How many standard drinks in a beer?A 12 oz beer at 5% ABV equals 1 standard drink.

Related calculators

References

1. NIAAA. Rethinking Drinking: What counts as a drink?
2. CDC. Dietary Guidelines for Alcohol
3. Gullberg. Alcohol density and standard drink calculation
4. NCI. Alcohol and cancer risk
5. USDA/HHS. 2020-2025 Dietary Guidelines for Americans
6. Turner. How much alcohol is in a standard drink?
7. NIAAA. Understanding Alcohol Drinking Patterns
8. NIAAA. Alcohol Use Disorder: A Comparison Between DSM-IV and DSM-5