Estimate your blood alcohol content (BAC) based on drinks consumed, body weight, gender, and time elapsed. Pure client-side calculator using the Widmark formula.
1 standard drink ≈ 14g pure alcohol (e.g., 12oz beer, 5oz wine, 1.5oz spirits)
This calculator provides estimates only. Actual BAC varies by individual metabolism, food consumption, drink strength, and other factors. Never use this as a basis to decide whether to drive. When in doubt, do not drive.
Blood Alcohol Content (BAC) is the percentage of alcohol in your bloodstream. This calculator uses the Widmark formula to estimate BAC based on standard drinks consumed, body weight, gender, and elapsed time. Gender matters because men and women metabolize alcohol differently due to differences in body water composition. All calculations happen in your browser — no data is sent to any server.