0.79‰ (per mille)
Result: 0.79 ‰ (per mille)Alcohol spreads through body water, so the same drink reads higher in a smaller or less watery body. The estimate uses average factors and an average clearance of 0.15 per mille an hour — the real range is 0.1 to 0.2. It cannot tell you whether you may drive; only a breath or blood test measures anything.
0.79‰
Open with these values0.91‰
Open with these values2.17‰
Open with these values‰ = grams of ethanol ÷ (kg × r) − 0.15 × hours
It estimates a concentration from average factors; it is not a measurement. Only a breath or blood test measures blood alcohol, and whether driving is allowed does not hang on this number.
Widmark assumes the alcohol is fully absorbed and evenly spread, which is untrue while you are still drinking. The absorption deficit and that uptake phase are left out of this calculator.
The reduction factor is published as 0.68 to 0.7 for men and 0.55 to 0.60 for women; this calculator takes the lower edge of each. Clearance is published as 0.1 to 0.2 per mille an hour, and the 0.15 used here is the middle of it.
A beer counts as 0.5 l at 5 %, a glass of wine as 0.2 l at 12 %, a shot as 2 cl at 40 %. Anything else needs both its volume and its strength filled in, or it does not count.
The calculator says I am fine to drive.
It says nothing about fitness to drive. It estimates a concentration from average values, and only a breath or blood test measures anything.
Two people who drank the same end up at the same reading.
Alcohol spreads through body water, so body mass and the distribution factor both move the result. The same three beers peak at 1.09 ‰ in an 80 kg man and about 1.66 ‰ in a 65 kg woman.
The estimate is good to the second decimal.
Clearance alone varies by a factor of two between people. The figure is accurate enough to inform, never enough to rely on.
| Serving | Pure alcohol | Peak in an 80 kg man | Peak in a 65 kg woman |
|---|---|---|---|
| Beer, 0.5 l at 5 % | 19.7 g | 0.36 ‰ | 0.55 ‰ |
| Wine, 0.2 l at 12 % | 18.9 g | 0.35 ‰ | 0.53 ‰ |
| Shot, 2 cl at 40 % | 6.3 g | 0.12 ‰ | 0.18 ‰ |
| Three beers | 59.2 g | 1.09 ‰ | 1.66 ‰ |
Grams of alcohol divided by body mass times the reduction factor — the Widmark formula. Three half-litre beers at 5 % hold 59.2 g of ethanol, and in an 80 kg man 59.2 ÷ (80 × 0.68) peaks at 1.09 per mille.
Alcohol distributes into body water, and men carry proportionally more of it, so the factor is about 0.68 against 0.55. The same three beers that peak at 1.09 per mille in an 80 kg man reach about 1.66 in a 65 kg woman, because both terms of the denominator are smaller.
About 0.15 per mille an hour, as a constant amount rather than a constant fraction, which makes the decline a straight line. The published range is 0.1 to 0.2 per mille an hour depending on liver function, habit and medication.
Accurate enough to inform, never enough to rely on. Widmark assumes the alcohol is fully absorbed and evenly spread, which is untrue for the first 30 to 90 minutes, and the clearance rate varies by a factor of two between people.
This calculator cannot answer that, and the honest advice is not to. German law already treats 0.3 per mille as criminal when driving is impaired, and learner and under-21 drivers face an absolute ban; limits differ in every other country.
Use the free-form serving: enter its volume in millilitres and its strength in percent, and it is added to the three counts. Both fields must be filled for it to count.
Information, not medical advice.
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