Free BAC calculator at baclevels.com. Estimate your blood alcohol content based on weight, gender, number of drinks, and time elapsed using the Widmark formula.
Dark-themed, mobile-first — built for real-world use.
- BAC Calculator — real-time BAC estimation with drink-by-drink tracking and timeline graph
- BAC Chart — reference table by weight and number of drinks for men and women
- ABV Calculator — compute alcohol by volume from gravity readings
- Standard Drinks Calculator — convert any beverage to standard drink equivalents
- Sober Calculator — estimate when your BAC returns to zero
- Calorie Calculator — alcohol calorie counter by drink type
- Hangover Calculator — severity prediction based on drinking pattern
- Legal BAC Limits — BAC limits by US state and international comparison
- Alcohol Tolerance — interactive self-assessment with risk factors
- Hangover Cures & Myths — evidence-based guide
Uses the Widmark formula:
BAC = (alcohol_grams / (body_water × 1000)) × 100 − (elimination_rate × hours)
Body water estimated from weight and gender. Average elimination rate: 0.015% per hour.
This calculator provides estimates for educational purposes only. BAC depends on many individual factors not captured by any formula. Never use calculated results to decide whether it is safe to drive. If you or someone you know struggles with alcohol use, contact SAMHSA at 1-800-662-4357.