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Blood Alcohol Calculator

Estimate your blood alcohol level (BAC) using the Widmark formula based on drinks consumed, weight, sex, and time elapsed.

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๐Ÿ‡ฉ๐Ÿ‡ฐ All calculations are based on Danish rules, rates, and currency (DKK). This calculator is translated for convenience but applies exclusively to Denmark.

Blood Alcohol Calculator

This calculator estimates your blood alcohol concentration (BAC) in promille (per mille) using the Widmark formula. In Denmark, one standard drink (genstand) contains 12 grams of pure alcohol, equivalent to roughly one beer (33 cl at 4.6%), one glass of wine (12 cl at 12%), or one shot of spirits (4 cl at 40%). The legal driving limit in Denmark is 0.5 promille.

How the Widmark Formula Works

The formula calculates BAC by dividing the total grams of alcohol consumed by your body weight multiplied by a distribution ratio (0.68 for men, 0.55 for women), then subtracting the alcohol your body has metabolised over time at approximately 0.15 promille per hour. Women generally have a lower distribution ratio because of differences in body water content.

Important Disclaimer

This calculator provides an estimate only and should never be used to determine whether it is safe to drive or operate machinery. Individual tolerance varies significantly based on factors including food intake, medication, fatigue, and personal metabolism. When in doubt, do not drive. Use public transport, a taxi, or a designated driver. In Denmark, penalties for drink-driving are severe and include fines, licence suspension, and imprisonment.

Frequently Asked Questions

What is the legal blood alcohol limit for driving in Denmark?

The legal limit for driving in Denmark is 0.5 promille (0.05% BAC). Penalties for exceeding this include fines, licence suspension, and potential imprisonment. For new drivers (under 3 years), even lower levels can lead to sanctions.

What counts as one standard drink (genstand) in Denmark?

One Danish standard drink contains 12 grams of pure alcohol. This equals roughly one beer (33 cl at 4.6%), one glass of wine (12 cl at 12%), or one shot of spirits (4 cl at 40%).

How fast does the body metabolize alcohol?

The body metabolizes alcohol at a rate of approximately 0.15 promille per hour. This means one standard drink takes roughly 1-1.5 hours to process. There is no way to speed up this process โ€” coffee, cold showers, or exercise do not help.

Why do women generally reach higher BAC than men?

Women typically have a lower water content in their bodies compared to men, which means alcohol is distributed in a smaller volume of fluid. This results in a higher blood alcohol concentration for the same amount of alcohol consumed.

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