HomeHealth & FitnessBAC Calculator

🍺 BAC Calculator

Estimate your blood alcohol content (BAC) using the Widmark formula based on weight, drinks consumed, and time elapsed.

The Widmark Formula

BAC is estimated using the Widmark formula: BAC = (alcohol in grams / (body weight in grams x r)) - (0.015 x hours), where r is the gender constant (0.68 for males, 0.55 for females). One standard drink contains approximately 14 grams of alcohol.

Important Disclaimer

This calculator provides estimates only. Actual BAC depends on many factors including food intake, medications, metabolism, and tolerance. Never rely on a calculator to determine if you are safe to drive. The legal limit in most US states is 0.08% BAC.

AD PLACEMENT — IN-CONTENT (728×90)