Find out exactly how long it takes to reach zero BAC after drinking. This free alcohol elimination timeline calculator shows your projected sobriety time based on the number and type of drinks consumed, your body weight, gender, and metabolism rate. The calculator uses the Widmark formula to estimate your peak BAC and then applies a linear elimination rate (default 0.15‰ per hour) to project when you'll return to zero. You can customize the elimination rate from "very slow" (0.10‰/hr) to "very fast" (0.20‰/hr) based on your personal metabolism — or use AlcoInsights' BAC calibration feature with a breathalyzer to determine your actual rate. Common scenarios: 3 beers (33cl, 5%) for a 75kg male produces an estimated peak BAC of roughly 0.4‰, taking approximately 2.5 hours to clear. 2 glasses of wine (175ml, 13%) for a 60kg female may produce a peak around 0.5‰, requiring approximately 3.5 hours to reach zero. A night of heavier drinking reaching 1.2‰ peak BAC could take 8+ hours to fully eliminate. Important context: you may feel sober long before your BAC actually reaches zero. This is called acute tolerance — your brain adapts to the presence of alcohol, masking impairment. Legal driving limits exist precisely because subjective feelings of sobriety don't match objective BAC measurements. Sources: NIAAA "Alcohol Metabolism," Widmark (1932), Jones (2010).