BAC Calculator

Estimate blood alcohol content from drinks, body weight, sex, and time.

Simplified Widmark estimate — not for legal driving decisions.

Body weight

Number of drinks

Drink volume (ml)

ABV %

Hours since first drink

Estimated BAC

0.029%

Uses ~0.015%/hr elimination. Educational only.

Steps

Rough Widmark-style estimate — never drive after drinking. Not legal proof of sobriety.

Are results official?

No—quick estimates only.

Is data saved?

No. Calculations run in your browser.