Blood Alcohol Concentration (BAC) Calculator
Calculate your blood alcohol concentration and understand the effects of alcohol consumption. Always drink responsibly and never drive under the influence.
Calculate Your BAC
Your BAC Results
Add your drinks and calculate your BAC
Understanding Blood Alcohol Concentration
Blood alcohol concentration (BAC) is a commonly used measure of alcohol intoxication. It is typically expressed as a percentage of alcohol per volume of blood. In the United States, the legal limit for BAC when driving is 0.08%.
Legal Limits by Age
Age 21 and Over
Legal limit: 0.08% BAC. Drivers with BAC equal to or greater than 0.08% can face penalties including fines, license suspension, and jail time.
Under Age 21
Legal limit: 0.01% to 0.05% (varies by state). Stricter penalties apply, including immediate license suspension and possible criminal charges.
BAC Effects and Impairment Levels
| BAC (%) | Behavior | Impairment |
|---|---|---|
| 0.001-0.029 | Average individual appears normal | Subtle effects that can be detected with special tests |
| 0.030-0.059 | Mild euphoria, Relaxation, Joyousness, Talkativeness, Decreased inhibition | Concentration |
| 0.060-0.099 | Blunted feelings, Reduced sensitivity to pain, Euphoria, Disinhibition, Extraversion | Reasoning, Depth perception, Peripheral vision, Glare recovery |
| 0.100-0.199 | Over-expression, Boisterousness, Possibility of nausea and vomiting | Reflexes, Reaction time, Gross motor control, Staggering, Slurred speech, Temporary erectile dysfunction |
| 0.200-0.299 | Nausea, Vomiting, Emotional swings, Anger or sadness, Partial loss of understanding, Impaired sensations, Decreased libido, Possibility of stupor | Severe motor impairment, Loss of consciousness, Memory blackout |
| 0.300-0.399 | Stupor, Central nervous system depression, Loss of understanding, Lapses in and out of consciousness, Low possibility of death | Bladder function, Breathing, Dysequilibrium, Heart rate |
| 0.400-0.500 | Severe central nervous system depression, Coma, Possibility of death | Breathing, Heart rate, Positional alcohol nystagmus |
| >0.50 | High possibility of death | Critical life-threatening levels |
Health Effects of Alcohol
Potential Benefits (Moderate Use)
- • Reduced risk of heart disease
- • Reduced risk of ischemic stroke
- • Reduced risk of diabetes
Note: Benefits are small compared to risks
Risks of Heavy Drinking
- • Increased cancer risk
- • Heart muscle damage
- • Liver disease
- • Brain damage
- • Accidental injury or death
Important Disclaimer: This calculator provides estimates only and should not be used to determine if you are safe to drive. BAC can vary based on many factors including food consumption, medications, health conditions, and individual metabolism. Always err on the side of caution and never drive under the influence of alcohol. If you plan to drink, arrange for a designated driver or alternative transportation.
