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Blood alcohol calculator (‰)
Add your drinks, weight, sex and the hours since you started drinking. The result is a rough estimate – it can never tell you that you are fit to drive.
Drinks
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🔒 Runs entirely in your browser – nothing you enter is uploaded or stored.
How to use it
- Choose sex and enter body weight.
- Enter how many drinks of each type and the hours since the first drink.
- Read the estimate and the time until about 0.0 ‰ – then still don't drive if in doubt.
Last checked: October 2026 · Based on: Widmark formula; §§ 24a, 24c German Road Traffic Act; § 316 Criminal Code. Found a mistake? Use the form below – we fix confirmed errors and update the date.
Frequently asked questions
How fast is alcohol broken down?
About 0.1 to 0.2 ‰ per hour; the calculator uses 0.15 ‰. Coffee, water or sleep do not speed it up.
How many beers are 0.5 ‰?
It depends on weight and sex: for an 80 kg man roughly two 0.5 l beers within a short time – but everyone reacts differently.
Is the result legally reliable?
No. Only a blood test counts. The Widmark formula is a rough estimate.