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
1
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.
2
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).
3
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.
4
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%).
5
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.
6
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