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Alcohol units calculator

Work out the alcohol units and grams in a drink from its volume and strength.

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Enter Volume (ml), Alcohol by volume (%) and the Alcohol units calculator works out Alcohol units (UK), Pure alcohol (g) straight away. For instance, with Volume (ml) = 500 and Alcohol by volume (%) = 5 it returns Alcohol units (UK) = 2.5 and Pure alcohol (g) = 19.725.

How to use it

  1. Enter your values: Volume (ml), Alcohol by volume (%).
  2. Read the result instantly: Alcohol units (UK), Pure alcohol (g).

Frequently asked questions

What does the Alcohol units calculator actually compute?

It takes Volume (ml) and Alcohol by volume (%) and derives Alcohol units (UK) and Pure alcohol (g) from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

2 values: Volume (ml) and Alcohol by volume (%). Nothing else is required — no account, no file upload.

Can you show a worked example?

With Volume (ml) = 500 and Alcohol by volume (%) = 5, the calculator returns Alcohol units (UK) = 2.5 and Pure alcohol (g) = 19.725. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Volume (ml) = 550 and Alcohol by volume (%) = 10 instead, Alcohol units (UK) goes from 2.5 to 5.5 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Volume (ml) = 450 and Alcohol by volume (%) = 2.5, Alcohol units (UK) comes out at 1.125. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Getting a reference point before a check-up, setting a realistic target, and understanding why two people of the same weight can be in very different shape — and, the same act from the other side, putting a day's caffeine, salt, sugar or alcohol beside the ceiling a health body publishes for it.

What is the most common mistake?

Reading BMI as a measure of health. It cannot tell muscle from fat, which is why athletes routinely score as overweight and why it says little about an individual.

How accurate is it, and what are the limits?

For general guidance only — not medical advice.

What is the difference between the Alcohol units calculator and the Blood alcohol calculator?

This one returns Alcohol units (UK) and Pure alcohol (g); the Blood alcohol calculator returns Blood alcohol concentration and Hours to sober. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Alcohol Calorie Calculator is the closest one after this: Add up the calories of a drinking session from a library of beers, wines, spirits and cocktails, with a custom-drink option.

Further reading

All guides →
ExplainerHow Many Units Are in a Drink?A drink's alcohol content depends on its strength (ABV) and volume. Learn how standard drinks and units are calculated and how to count yours.ExplainerHow Long Does Alcohol Stay in Your System?The body clears roughly one standard drink per hour. See how long alcohol stays in blood, breath and urine — and why you can't rush it.ExplainerWaist-to-Hip Ratio Explained: The Thresholds, and Where to Put the TapeWHO puts abdominal obesity at a ratio of 0.90 or more for men and 0.85 or more for women. But measuring in the wrong place changes the answer more than the threshold does — here is exactly where the tape goes.ExplainerIs BMI Reliable? The Limitations of Body Mass IndexBMI is a quick screen, not a diagnosis. Learn what it misses — muscle, fat distribution, age — and what to check alongside it.ExplainerAm I Overweight? Why One Number Cannot SayBMI reads muscular bodies as heavy and cannot see where fat sits at all — which is exactly why the waist measures exist. Here are the published waist and waist-to-height thresholds, a worked case where BMI and waist give opposite answers, an honest account of the contested mortality curves, and the 2025 shift toward defining obesity by adiposity and organ function rather than by a ratio.ExplainerAm I Underweight? What the Question Is Really AskingThe 18.5 cut-off is a population screening line, not a diagnosis. Here is where it comes from, what the mortality data below it actually show, and the three things it cannot see: body composition, recent change — which is far more informative than the level — and the fact that the same line does not fit every age or every population.