BAC Time to Sober Calculator
Estimate how long until your blood alcohol concentration returns to zero.
Use our BAC Calculator if you don't know your current BAC
Formula
Time to 0 BAC ≈ Current BAC ÷ 0.015 (average elimination rate per hour)How Alcohol Elimination Works
Your liver metabolizes alcohol at a roughly constant rate of about 0.015% BAC per hour. Nothing speeds this up — not coffee, food, cold showers, or exercise. This calculator estimates how long until your BAC reaches zero.
Important: This is an estimate only. Never drive if you've been drinking. Individual rates vary.
Frequently Asked Questions
How fast does the body process alcohol?
On average, your BAC drops by about 0.015% per hour. This rate varies by individual and cannot be sped up.
Can coffee or food sober you up faster?
No. Only time reduces BAC. Coffee may make you more alert but doesn't reduce blood alcohol. Food before drinking slows absorption but doesn't speed elimination.