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Alcohol Unit Calculator

Work out units and standard drinks from volume, strength and count, with a blood alcohol estimate.

Alcohol units and blood alcohol

Total units: —
US standard drinks: —
Estimated blood alcohol: —
Estimates use the Widmark formula and are for general information only, not medical advice.

How to use the Alcohol Unit Calculator

  1. Enter the volume, the strength and the number of drinks you had.
  2. Add your body weight, body type and the hours since the first drink.
  3. Read the units, the standard drinks and the estimated blood alcohol.

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Frequently Asked Questions

Common questions about the free online alcohol unit calculator.

One UK unit is 10 millilitres of pure alcohol, which is roughly a small glass of wine or half a pint of average beer.
Multiply the volume in millilitres by the strength as a percentage, then divide by 1000 to get the units in that drink.
A US standard drink contains about 14 grams of pure alcohol, which is close to a 350 ml regular beer or a small glass of wine.
The UK advises no more than 14 units a week, Australia 10 standard drinks and the United States up to 14 drinks for men.
The Widmark formula gives a rough figure only. Food, medication, health and how fast you drink all change the real result.
No. Never rely on an estimate to judge whether you can drive. Use a calibrated breathalyser or do not drive at all.
No. Every figure here is an estimate for general information and not medical advice, so ask a clinician about your own drinking.
Yes. The alcohol unit calculator is completely free, runs locally in your browser and stores nothing you enter.

Last updated: October 10, 2026