Blood Alcohol Content Calculator
Calculate your Blood Alcohol Content (BAC) and get safety recommendations based on your measurements
BAC Calculator
One standard drink = 12 oz beer (5% alcohol), 5 oz wine (12% alcohol), or 1.5 oz spirits (40% alcohol)
Enter Your Information
Fill in your details above to calculate your BAC level
BAC History
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How to Use the BAC Calculator
Enter Your Physical Information
Input your weight and select your gender. These factors significantly affect alcohol absorption and BAC calculation using the scientifically-proven Widmark formula.
Count Your Standard Drinks
Enter the number of standard drinks consumed. One standard drink equals 12oz beer (5% alcohol), 5oz wine (12% alcohol), or 1.5oz spirits (40% alcohol).
Specify Time Since Last Drink
Enter hours since your last alcoholic drink. The body eliminates alcohol at approximately 0.015% BAC per hour, regardless of attempts to speed up the process.
Review BAC Level & Safety Category
Analyze your calculated BAC level and corresponding safety category: Safe (≤0.05%), Caution (0.05-0.08%), Impaired (0.08-0.15%), or Dangerous (>0.15%).
Check Time to Zero BAC
See estimated time for your BAC to return to 0.00%. Only time can eliminate alcohol - coffee, cold showers, or exercise won't speed up the process.
Follow Safety Recommendations
Make responsible decisions based on your BAC level and legal status. Never drive if your BAC is above the legal limit (0.08% in most jurisdictions).
Critical BAC Safety & Awareness Tips
BAC continues rising 30-90 minutes after last drink due to absorption time - avoid driving even if you 'feel fine'
Only time eliminates alcohol: coffee, cold showers, exercise, or vomiting cannot speed up BAC reduction
Food slows absorption but doesn't prevent intoxication - eating after drinking won't lower existing BAC levels
Medications can amplify alcohol effects: consult healthcare providers about alcohol interactions with prescriptions
Body weight matters: lighter individuals reach higher BAC levels faster with the same amount of alcohol
Gender differences: women generally have higher BAC than men due to lower water content and different metabolism
Age affects tolerance: alcohol metabolism slows with age, leading to higher BAC levels in older adults
Never rely on BAC calculators for legal decisions - they're estimates only; use professional breathalyzer or blood tests
Alcohol poisoning signs: confusion, vomiting, seizures, slow breathing, unconsciousness - call 911 immediately
Plan safe transportation: designated drivers, rideshare, public transit, or staying overnight are responsible choices