# 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
- drinks_to_reach_permille: how many servings of a drink reach a given
  permille level for a person, at once or over some hours, as a range
- convert_breath_blood_alcohol: breath mg/l to blood permille and back
  (German legal ratio 1:2000)
- drink_driving_limits_europe: limits for car drivers in 25 European
  countries, with stricter limits for novice and professional drivers

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
- [Promille-Tabelle](https://www.alcometer.de/promille-tabelle/): peak permille for 1-6 beers or glasses of wine by body weight and sex
- [Alkohol nachweisbar](https://www.alcometer.de/alkohol-nachweisbar/): detection windows in breath, blood, urine (EtG), hair, PEth; breath mg/l to permille
- [0,3](https://www.alcometer.de/0-3-promille/), [0,5](https://www.alcometer.de/0-5-promille/), [0,8](https://www.alcometer.de/0-8-promille/), [1,1](https://www.alcometer.de/1-1-promille/), [1,6 Promille](https://www.alcometer.de/1-6-promille/): drinks to reach the level by weight and sex, effects, legal consequences, time to 0.0
- [Promille und Wirkung](https://www.alcometer.de/promille-wirkung/): effects by permille range
- [Promillegrenze Fahrrad](https://www.alcometer.de/promillegrenze-fahrrad/): limits for bicycles, pedelecs, e-scooters
- [Probezeit](https://www.alcometer.de/probezeit-alkohol/): the 0.0 rule for novice and under-21 drivers
- [Promillegrenzen im Ausland](https://www.alcometer.de/promillegrenzen-ausland/): drink-driving limits in Europe
- [Atemalkohol](https://www.alcometer.de/atemalkohol/): breath mg/l to permille and back
- [Alkohol in Gramm](https://www.alcometer.de/alkohol-in-gramm/): ml and vol% to grams, standard drinks
- [Für Entwickler](https://www.alcometer.de/fuer-entwickler/): MCP documentation