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Calculators/Health & Fitness
BAC Calculator
Estimate your Blood Alcohol Content (BAC) based on drinks consumed, body weight, gender, and time elapsed. Includes legal limit reference and impairment status.
Disclaimer: This calculator provides estimates only. Never drink and drive. Actual BAC depends on many individual factors. BAC 0.08% is the legal driving limit in all US states.
lbs
oz
%
hrs
BAC Level
SoberSlightImpairedDrunkSevere
Estimated BAC
0.038%
Legal Limit (US)
0.080%
Status
Slightly impaired
How to Use This Calculator
1
What counts as a standard drink?
A standard drink in the US contains 14 grams (0.6 fl oz) of pure alcohol. That's: 12 oz regular beer (5% ABV), 5 oz wine (12% ABV), or 1.5 oz distilled spirits (40% ABV). Enter the actual size and ABV of what you drank for the most accurate estimate.
2
Enter your drinks and timing
Enter the number of drinks, the size of each drink, and its ABV. The calculator assumes all drinks were consumed within a typical drinking session, not spread across the full elapsed time.
3
Understand the result
At 0.08% BAC you are legally impaired for driving in all US states. The calculator estimates roughly 0.015% per hour of alcohol elimination. Individual metabolism varies — never drive based solely on a calculator estimate.
Real-World Examples
Two Beers After 1 Hour
Weight
160 lbs (male)
Drinks
2 × 12 oz beer (5%)
Time
1 hour ago
Result~0.031% BAC
Slightly impaired. Well below the legal limit, but reaction time is still affected.
Four Drinks, No Time Elapsed
Weight
130 lbs (female)
Drinks
4 × 5 oz wine (12%)
Time
0 hours
Result~0.153% BAC
Severely impaired. Far above legal limit — do not drive.
Frequently Asked Questions
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