Health

Blood alcohol calculator

The calculator uses a simplified Widmark calculation. The result is only a rough guide and never a basis for driving.

Updated on Apr 21, 2026 Calculator, calculation path and examples on one page

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Calculator

Gender

Body weight in kg

Beer 0.5 l (5% vol)

Wine 0.2 l (12% vol)

Shots 4 cl (40% vol)

Hours since drinking started

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Examples

Typical calculations

80 kg, two beers, 3 hours.

Two beers

Estimated current per mille: 0.29‰

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65 kg, two glasses of wine, 4 hours.

Wine evening

Estimated current per mille: 0.47 ‰

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75 kg, beer and shots.

Mixed evening

Estimated current per mille: 0.85 ‰

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FAQ

Frequently asked questions

How accurate is the calculator?

Just roughly. Speed of intake, food, gender, body type and state of health significantly change the actual value.

Why does the calculator show a peak value and a current value?

This way you can see what would theoretically be possible immediately after drinking and how time affects it.

Is alcohol reduction really always 0.15 per mille per hour?

No. This is just a common guideline for rough calculations.

Can I rely on the value to drive?

No. The computer is expressly not intended for this.

Why does the calculator use standard drinks?

So that the calculation remains simple and usable for typical everyday situations.

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Sources and notes

Rule status and context

Method: Simplified Widmark formula with a flat mining value of 0.15‰ per hour.