Standard Drink & Alcohol Units Calculator

A 250 ml glass of 13% wine is how many units? The exact math for UK units and US/AU standard drinks, plus the weekly guideline context.

Quick answer: Enter any drink's volume and ABV to see UK alcohol units, US and Australian standard drinks — the plain math behind the guidelines. Educational, instant, private; no judgement, no uploads.

–UK units

–US std drinks

–AU std drinks

–% of UK 14-unit week

Educational arithmetic from public guidelines — not medical advice. UK low-risk guidance: ≤14 units/week, spread over 3+ days.

How to use

Pick a drink type (auto-fills typical ABV) or enter your own.
Enter the poured volume in ml.
Read UK units + US/AU standard drinks and how much of the weekly guideline that is.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance); content last reviewed September 2026. For decisions that matter, confirm with a licensed professional in your country.

About this tool

Pure alcohol mass = volume (ml) × ABV% × 0.789 g/ml. UK units = grams ÷ 8; US standard drink = 14 g; Australian = 10 g. Guidelines (UK: ≤14 units/week for everyone; US: ≤2/1 drinks per day for men/women) are public-health references, not medical advice. This tool is deliberately educational: it shows the arithmetic so labels and menus stop being opaque. If alcohol is a concern for you, talk to a healthcare professional.

FAQ

Why do US and UK numbers differ?

They define different 'standard' amounts (14 g vs 8 g per unit) — the underlying alcohol mass is identical; we show both.

Is this medical advice?

No — educational arithmetic based on public guidelines. Personal limits are a medical conversation.

Does ABV matter more than volume?

Both multiply together: a 5% pint and a 13% large wine glass can carry the same alcohol — the tool makes that visible.

Rate this tool

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The complete standard drink calculator guide

Prefer the long version — a worked example, the mistakes people actually make, and answers to real questions? The blog guide Standard Drink Calculator — Complete Guide, Mistakes & FAQ covers all of it step by step.

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Standard Drink & Alcohol Units Calculator

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The complete standard drink calculator guide