About the Hangover Recovery Time Calculator
This calculator uses the Widmark formula to estimate blood alcohol concentration (BAC) based on alcohol consumed, body weight, and drinking duration. The liver processes alcohol at a fairly consistent rate — approximately 0.015% BAC per hour — so dividing peak BAC by this rate gives a reasonable estimate of time to sobriety.
Heavier individuals have more body water, which dilutes the same amount of alcohol to a lower BAC. Drinking over a longer period allows some metabolism to occur during the session, reducing peak BAC. Drinking on an empty stomach significantly accelerates absorption and raises the peak. Sex also matters: women typically have a lower body water ratio and process alcohol more slowly, so this estimate may be conservative for women.
This is a reference estimate only. Individual metabolism varies based on liver health, medications, fatigue, and genetic factors. Never drive based solely on a calculated time — if in doubt, use a breathalyzer or wait longer. The legal DUI limit in most US states is 0.08% BAC.
FAQ
Sleep is the most effective hangover recovery method, but it doesn't speed up alcohol metabolism. Sleeping through the calculated recovery time allows your body to process the alcohol while you rest. Drinking 16+ oz of water before bed can prevent dehydration headaches.
Not necessarily. If you drank heavily late at night, your BAC may still exceed the legal limit the next morning. Always wait beyond the estimated recovery time before driving, or use a reliable breathalyzer to confirm you're under the legal limit.