Health
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Alcohol Units Calculator.
Convert beverage volume and ABV into alcohol units using a user-entered pure-ethanol unit definition.
Set your values
Results update as you type.
Use the definition for your region or purpose
Arithmetic only: the result depends on the unit definition you enter. It is not a measure of impairment or a recommendation about alcohol use.
How to Use
Pure ethanol (mL) = beverage volume (mL) × ABV ÷ 100. Units = pure ethanol (mL) ÷ the user-entered mL-per-unit definition.
Unit definitions vary by jurisdiction. Enter the definition you want to use; this page does not provide consumption, driving, or medical guidance.
FAQs
How are alcohol units calculated?
Pure ethanol volume is beverage volume multiplied by ABV as a fraction. Divide that volume by the pure-ethanol millilitres per unit that you enter.
Why must I enter millilitres per unit?
Unit definitions differ by jurisdiction. Entering the definition keeps the conversion explicit and avoids an unlabelled regional assumption.
Use Cases
Track weekly alcohol intake
Use the calculator to sum units from different drinks to see if you stay within recommended guidelines, such as 14 units per week in the UK.
Example: A 250 ml glass of wine at 13% ABV equals 3.25 UK units.
Compare drinks across countries
When traveling or reading international labels, convert to your local unit definition to understand how much you're drinking.
Example: A 330 ml beer at 5% ABV is 1.65 UK units but 1.18 US units.
Frequently Asked Questions
- What is an alcohol unit?
- An alcohol unit is a standard measure of pure alcohol in a drink. It helps track consumption. The definition varies by country, e.g., 10 ml in the UK, 14 g in the US. This calculator lets you choose your unit definition.
- How do I calculate alcohol units?
- Enter the volume of your drink and its ABV (alcohol by volume). The calculator multiplies volume by ABV to get pure alcohol, then divides by your chosen unit size (e.g., 10 ml or 14 g).
- Why do unit definitions differ?
- Different countries set their own standard unit to reflect typical serving sizes and public health guidelines. For example, the UK uses 10 ml, while the US uses 14 g. This calculator lets you select the definition that applies to you.
Tips & Common Mistakes
Tips
- Always check the ABV on the label; it can vary significantly between brands and types of alcohol.
- Use the same unit definition consistently when tracking your intake over time.
- Remember that home-poured drinks may be larger than standard serving sizes, so measure accurately.
- If you're counting units for health guidelines, note that guidelines may differ by country and gender.
Common Mistakes to Avoid
- Forgetting to convert volume to the same units as the unit definition (e.g., using ml vs. liters).
- Mixing up ABV percentage with decimal (e.g., using 5 instead of 0.05).
- Assuming a standard drink size is always the same; actual pours can be larger.
Last updated: August 13, 2026