Alcohol Units Calculator

Calculate alcohol units in up to 5 drinks and track your weekly total vs the NHS 14-unit guideline. Shows calories from alcohol and equivalent wine glasses.

The alcohol units calculator converts the volume and ABV (alcohol by volume) percentage of drinks into UK alcohol units, helping you track your weekly intake against NHS guidelines. One UK unit equals 10ml (8g) of pure alcohol — the amount the average adult liver can process in about one hour. Because drinks vary enormously in strength and serving size, units are a much more reliable measure than "number of drinks." BMI Calculator and Daily Calories Calculator provide related health and nutrition context.

The NHS recommends that both men and women drink no more than 14 units per week, spread over at least 3 days rather than consumed in one or two sessions. This guideline was revised in 2016 — previously, men were allowed 21 units — after evidence showed no meaningful sex difference in long-term alcohol risk. The calculator also shows calories from alcohol, since ethanol contributes 7 kcal per gram (almost as calorie-dense as fat at 9 kcal/g), a figure that surprises most drinkers.

Select a drink type from the dropdown (wine, beer, spirit, etc.) or choose "Custom" to enter your own volume and ABV.
Enter the volume in ml and the ABV percentage shown on the label.
Add up to 5 drinks using the + button — each is calculated separately and summed.
Read the total units, weekly guideline comparison, calories from alcohol, and wine glass equivalents.
Use the weekly total progress bar to visualise where you stand relative to the NHS 14-unit limit.

The alcohol units formula explained

Units = (Volume in ml × ABV%) ÷ 1,000

This formula derives directly from the definition: 1 unit = 10ml of pure alcohol. Multiplying volume by ABV/100 gives ml of pure alcohol in the drink; dividing by 10 gives units. Calories are calculated as: Calories = Units × 8g × 7 kcal/g = Units × 56 kcal (since 1 unit = 8g of ethanol and ethanol provides ~7 kcal/g).

Worked example: a 250ml glass of 13% wine → (250 × 13) ÷ 1,000 = 3.25 units. Calories = 3.25 × 56 ≈ 182 kcal. A pint (568ml) of 5% beer → (568 × 5) ÷ 1,000 = 2.84 units. Calories ≈ 159 kcal from alcohol alone (not counting carbohydrates in beer).

Understanding your alcohol units result

What the NHS 14-unit guideline means in practice

14 units per week is equivalent to: 6 pints of average-strength (4%) beer, or 10 small (125ml) glasses of 12% wine, or 14 single (25ml) measures of 40% spirits. Drinking more than 14 units regularly increases the risk of liver disease, several cancers (mouth, throat, oesophagus, breast, bowel), and cardiovascular disease. The risk is not threshold-based — it rises linearly from any regular alcohol consumption above zero. Binge drinking (more than 6 units in a single session for women, 8 for men) carries additional acute risks regardless of weekly total.

Calories from alcohol are often called "empty calories" — they provide no nutritional value beyond energy. For someone on a 2,000 kcal/day diet, 3 glasses of wine adds 15–18% of daily calorie intake. The Protein Intake Calculator can help visualise the calorie impact on weight over time.

Health tips and best practices

Alternate alcoholic drinks with water — this halves your unit intake and reduces next-day dehydration without necessarily stopping drinking.
Choose lower-ABV options: many beers now offer 3.5–4% versions; wines at 9–11% are widely available and have ~30% fewer units per glass than 14% wines.
Use smaller glasses — a standard 125ml wine glass vs a large 250ml glass halves the units per pour.
Spread drinking over 3+ days rather than saving all 14 units for the weekend — binge patterns carry more health risk than the same number spread out.
Alcohol disrupts REM sleep even in low quantities — even 2 units before bed measurably reduces sleep quality (see the sleep cycle calculator).
If you are trying to lose weight, remember alcohol has 7 kcal/g — a bottle of wine is roughly 600 kcal, equivalent to a large meal.

Alcohol is the leading risk factor for disease burden in people aged 15–49 globally (Global Burden of Disease, 2019).
In England, 24% of adults drink more than 14 units per week (NHS Digital, 2022).
Alcohol is causally linked to at least 7 types of cancer; the link to breast cancer exists at even low consumption levels.
Alcohol-related deaths in the UK reached a record high of 9,641 in 2021 — the majority from liver disease (ONS, 2022).

Common mistakes to avoid

Using "standard drinks" from other countries — a US standard drink is 14g alcohol (1.75 units), an Australian standard drink is 10g (1 unit), so the number differs significantly from UK units.
Underestimating home measures — home pours are typically 30–50% larger than pub measures, meaning home "single" spirits often equal 1.5–2 units.
Forgetting alcohol in cooking — a glass of wine used in cooking loses most alcohol through evaporation, but this varies significantly with cooking time and method.
Tracking units instead of drinking patterns — 14 units spread over 7 days carries lower risk than 14 units consumed in 2 sessions, even though the weekly total is identical.

Unit calculations use the standard UK definition of 1 unit = 10ml/8g of pure alcohol, as adopted by the NHS, Drinkaware, and the UK Chief Medical Officers. The 14-unit weekly guideline reflects the 2016 UK Chief Medical Officers' Low Risk Drinking Guidelines. Calorie figures use the standard ethanol energy value of 7 kcal/g. This tool is for educational purposes only — it does not constitute medical advice. If you are concerned about your alcohol use, or if alcohol is affecting your health, relationships, or work, contact your GP, the NHS alcohol support helpline (0300 123 1110), or Alcoholics Anonymous. If you are pregnant or trying to conceive, the NHS recommends avoiding alcohol entirely.