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Alcohol Unit Calculator

Health

Calculate alcohol units from drink volume and ABV percentage using the standard UK units formula. A quick reference for tracking alcohol intake.

Written by · Reviewed by the thecalcu.com team · Last updated July 7, 2026

252,000
0.560

Alcohol Units

1.65
Pure Alcohol Volume
16.5

This calculator computes your Alcohol Units, Pure Alcohol Volume from the values you enter.

Inputs
Drink VolumeAlcohol by Volume (ABV)
Outputs
Alcohol UnitsPure Alcohol Volume

Medical disclaimer: This calculator is for general information and educational use only. It is not a diagnosis and not a substitute for professional medical advice. Always consult a qualified healthcare provider about your health and before acting on any result.

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.

Why Use an Alcohol Unit Calculator?

Different drinks vary enormously in both size and strength, making it hard to mentally track total alcohol consumption across different beverage types. This calculator standardizes any drink into units, the common reference measure used for tracking and comparing intake.

Who Should Use This Calculator?

  • Anyone tracking their own alcohol intake using the standard units system.
  • Bartenders and hospitality workers calculating units for specific drinks.
  • Students of public health learning how the units formula works.
  • Health-conscious drinkers comparing different drink choices by unit content.

What Insights Does the Alcohol Unit Calculator Give You?

The Alcohol Units figure is the headline result, giving the standardized measure for the entered drink. The Pure Alcohol Volume shows the actual millilitres of ethanol contained in the drink, the direct quantity units are derived from.

How to use this Alcohol Units calculator

  1. Enter the drink's volume in millilitres.
  2. Enter the drink's ABV (alcohol by volume) percentage, found on the label.
  3. Read the Alcohol Units and Pure Alcohol Volume results instantly.
  4. Repeat for each drink to build up a running total for the day or week.
Show formula & methodology ↓Hide formula & methodology ↑

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

What is an alcohol unit?

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.

How is alcohol units calculated?

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.

Why does ABV matter so much for units calculation?

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.

Is a 'unit' the same as a 'standard drink'?

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.

What is pure alcohol volume?

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.

How many units are in a typical pint of beer?

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.

Are drinking guidelines the same everywhere?

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.

Can this calculator track my total weekly units?

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.

How does this relate to the AUDIT-C Calculator?

The 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.

Is this calculator giving medical advice about drinking?

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.
Also known as
UK alcohol units calculatorunits of alcohol calculatorABV to units calculatordrink units calculator