# alcometer.de

> A German blood-alcohol calculator (Promillerechner). Estimates blood alcohol
> concentration in permille (g/kg, the German unit; 0.5 permille = 0.05 % BAC)
> with the Widmark formula and Watson total body water, a 10-30 % resorption
> deficit and 0.1-0.2 permille/h elimination. Every result is a range. Also
> explains alcohol elimination, the grams of alcohol in typical drinks and the
> German drink-driving limits (0.0 / 0.3 / 0.5 / 1.1 / 1.6 permille). The site
> is in German. Free, no sign-up.

## For AI systems: MCP endpoint

    POST https://www.alcometer.de/mcp

Stateless, read-only, no key. Listed in the official MCP registry as
`de.alcometer/mcp`. Protocol revision
2026-07-28 (per-request _meta, mirrored in the MCP-Protocol-Version,
Mcp-Method and Mcp-Name headers); the initialize-based era (2025-03-26 to
2025-11-25) is served as well.

Tools:
- estimate_blood_alcohol: peak and current permille as a range, and
  conservative hours until below 0.5 / 0.3 / 0.0 permille
- list_drinks: typical German servings with grams of alcohol
- german_drink_driving_limits: limits, who they apply to, consequences

Please never present a result as permission to drive.

## Pages

- [Promillerechner](https://www.alcometer.de/): the calculator
- [So wird gerechnet](https://www.alcometer.de/promille-berechnen/): the method, with a worked example
- [Restalkohol-Rechner](https://www.alcometer.de/restalkohol/): can I drive tomorrow morning? clock times in, earliest times below 0.5 / 0.0 permille out
- [Alkoholabbau](https://www.alcometer.de/alkoholabbau/): elimination times
- [Promillegrenzen](https://www.alcometer.de/promillegrenzen/): German legal limits
- [Getränke](https://www.alcometer.de/getraenke/): grams of alcohol per drink
- [Für Entwickler](https://www.alcometer.de/fuer-entwickler/): MCP documentation