health calculator
BAC Calculator
Estimate blood alcohol concentration based on drinks, weight, and time.
Inputs
Gender
drinks
lbs
hours
Results
Estimated BAC %
0.049%
Safety StatusSome Alcohol Effects (> 0%)
Drinks Consumed3 standard drinks
Time Elapsed2 hours
Formula
Widmark BAC formula
BAC % = (A × 5.14 / (W × r)) - 0.015 × HA = liquid ounces of pure alcohol. W = weight in lbs. r = gender rate (0.73 male, 0.66 female). H = hours.
Step by step
How the calculation works
- 1Enter the number of standard drinks consumed (1 drink = 12oz of 5% beer, 5oz of 12% wine, or 1.5oz of 40% spirits).
- 2Provide your body weight in pounds.
- 3Choose your gender (determines body water absorption constants).
- 4Specify elapsed hours since the first drink to account for metabolism.
Related guides
Learn more about this calculation
Guide
BAC Guide: Understanding Blood Alcohol Concentration
Learn how blood alcohol concentration (BAC) is estimated using the Widmark formula. Understand alcohol metabolism and safety limits.
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