BAC Calculator
Calculate your estimated Blood Alcohol Concentration (BAC) level based on your weight, gender, alcohol consumption, and time spent drinking. BAC is used to determine legal intoxication levels for driving or other activities.
Your Estimated BAC: 0.000%
Legal limit for driving is typically 0.08%
| Total Alcohol Consumed | 0.00 oz (0.00 ml) |
|---|---|
| Total Pure Alcohol | 0.00 oz (0.00 ml) |
| Time Since First Drink | 0 hours 0 minutes |
| Alcohol Elimination Rate | 0.015% per hour |
| Time Until Sober (BAC = 0%) | 0 hours 0 minutes |
About BAC Calculator
Blood Alcohol Concentration (BAC) is a measure of the amount of alcohol in your bloodstream. It is typically expressed as a percentage of alcohol per volume of blood. For example, a BAC of 0.08% means that there are 0.08 grams of alcohol per 100 milliliters of blood.
How BAC is Calculated
The Widmark formula is commonly used to estimate BAC:
BAC = (Alcohol consumed in grams / (Body weight in grams × r)) × 100 - (Elimination rate × hours)
Where:
- r is the gender constant (0.68 for men, 0.55 for women)
- Elimination rate is typically 0.015% per hour
Understanding BAC Levels
Different BAC levels produce varying effects:
- 0.000-0.029%: No impairment expected
- 0.030-0.059%: Mild euphoria and relaxation
- 0.060-0.099%: Impaired judgment and coordination
- 0.100-0.199%: Significant impairment, legal intoxication
- 0.200-0.299%: Severe impairment, possible blackouts
- 0.300%+: Life-threatening, potential alcohol poisoning
Factors Affecting BAC
Several factors can influence your BAC beyond just the amount of alcohol consumed:
- Body weight: Heavier people have more blood to dilute alcohol
- Gender: Women typically have higher BAC than men after same drinks
- Food intake: Eating slows alcohol absorption
- Metabolism: Individual variations in alcohol processing
- Medications: Some drugs can interact with alcohol
Legal Implications
In most U.S. states, the legal limit for driving is 0.08% BAC. Commercial drivers have a lower limit of 0.04%, and for drivers under 21, many states have a "zero tolerance" policy with limits as low as 0.01-0.02%.