Alcohol Unit Calculator
HealthCalculate alcohol units from drink volume and ABV percentage using the standard UK units formula. A quick reference for tracking alcohol intake.
Alcohol Units
1.65
Pure Alcohol Volume
16.5
What is a Alcohol Units?
The Alcohol Unit Calculator computes alcohol units from a drink's volume and ABV (alcohol by volume) percentage, using the standard UK units formula. Enter any drink's size and strength for an instant unit count.
For related alcohol-related tools, see the AUDIT-C Calculator and AUDIT Score Calculator.
How to use this Alcohol Units calculator
- Enter the drink's volume in millilitres.
- Enter the drink's ABV (alcohol by volume) percentage, found on the label.
- Read the Alcohol Units and Pure Alcohol Volume results instantly.
- Repeat for each drink to build up a running total for the day or week.
Formula & Methodology
Units = (Volume in mL × ABV%) ÷ 1,000 Pure Alcohol Volume (mL) = Volume × (ABV% ÷ 100) Worked example — a 330 mL beer at 5% ABV: Units = (330 × 5) ÷ 1,000 = 1.65 units Pure Alcohol Volume = 330 × 0.05 = 16.5 mL
Frequently Asked Questions
An alcohol unit is a standard measure (widely used in the UK and several other countries) representing 10 mL or 8 grams of pure alcohol, used to help people track and compare alcohol intake across different drink types and strengths.
Units are calculated by multiplying the drink's volume in millilitres by its ABV (alcohol by volume) percentage, then dividing by 1,000 — the standard UK units formula.
Two drinks of the same size can contain very different amounts of pure alcohol depending on their ABV — a strong beer and a light beer of the same volume will have meaningfully different unit counts, which is why ABV is central to the calculation.
Not exactly — the UK unit (10 mL pure alcohol) is smaller than the US standard drink (about 14 grams / 17.7 mL pure alcohol), so the same beverage will produce a different number depending on which system is used. This calculator uses the UK units formula.
Pure alcohol volume is the actual amount of ethanol contained within a drink, calculated by multiplying the drink's total volume by its ABV percentage — it's the direct building block used to calculate units.
A typical pint (568 mL) of beer at 4-5% ABV works out to roughly 2.3 to 2.8 units, though this varies with the specific beer's actual ABV and pour size.
No — recommended weekly unit or drink limits vary by country and health authority, so any specific guideline should come from your local health authority rather than assumed from this calculator alone.
This calculator computes units for a single drink at a time; tracking a weekly total would require adding up units from each individual drink entered separately.
The [AUDIT-C Calculator](/audit-c-calculator/) is a broader screening questionnaire about drinking patterns, while this calculator computes the precise unit count for a specific drink — the two serve complementary purposes in understanding alcohol consumption.
No — this is a general unit calculation tool based on standard formulas. It does not provide personalized health guidance about alcohol consumption, which should come from a healthcare professional if you have concerns.
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