Promille & THC Rechner
Zwei kostenlose Tools zur Selbsteinschätzung — kein Login, keine Speicherung deiner Daten.
Promillerechner
Berechne deinen geschätzten Blutalkoholwert (BAK) anhand von Geschlecht, Gewicht, Getränken und Zeit. Mit rechtlichen Grenzwerten und MPU-Relevanz.
Jetzt berechnenTHC-Nachweisrechner
Schätze ab, wie lange THC in Blut, Urin und Haaren nachweisbar ist. Mit aktuellem Grenzwert von 3,5 ng/mL (seit KCanG 2024) und MPU-Info.
Jetzt berechnenAbout these calculators
Two tools, one purpose: helping you understand the numbers behind a possible MPU. Both run entirely in the browser — no data is sent to any server.
Blood alcohol (BAC)
The BAC calculator estimates blood alcohol content from your gender, weight, drinks and elapsed time using the Widmark formula (1932). Useful for understanding the rough range you would have hit at a particular point in the evening — not as legal evidence. See MPU due to alcohol for the full picture on hypotheses A1–A4 and the legal framework.
THC detection
The THC calculator estimates how long active THC and the THC-COOH metabolite remain detectable in blood, urine and hair, scaled by use frequency and body fat. Since the cannabis act (KCanG, 22 August 2024), the legal limit is 3.5 ng/mL active THC. See MPU due to drugs for hypotheses D1–D4 and abstinence proof for the documentation requirements.
Privacy
All calculations happen in your browser. We do not store the values you enter, we do not need an account, and we do not link the results to your IP address. Plausible analytics is page-view only — no behavioural tracking.
Disclaimer
Both calculators are estimation tools. Results have an error margin of ±20–30 % depending on individual factors (metabolism, body fat, food, medication). Authoritative measurements are taken by the police via breath test or blood sample. These tools do not replace medical, legal or psychological advice.