Calculate your blood alcohol content (BAC) based on drinks consumed, body weight, gender, and time elapsed to estimate alcohol impairment level.
Blood Alcohol Content (BAC)
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Impairment Level
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Legal Driving Status
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Total Standard Drinks
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Time Until BAC Reaches 0%
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Blood Alcohol Content (BAC) is a measurement of the amount of alcohol in your blood, expressed as a percentage. For example, a BAC of 0.08% means there are 0.08 grams of alcohol per 100 milliliters of blood.
In the United States, the legal BAC limit for drivers over 21 is 0.08%. For drivers under 21, the limit is much lower, typically ranging from 0.01% to 0.05% depending on the state.
This calculator provides estimates based on general formulas and should not be used to determine if you're safe to drive. Many factors like food consumption, medications, and individual metabolism can affect your actual BAC.
Women typically have lower water content in their bodies compared to men, which means alcohol becomes more concentrated in their blood. This biological difference is factored into BAC calculations.
The body typically metabolizes alcohol at a rate of about 0.015% BAC per hour. However, this rate can vary based on factors like liver function, food consumption, and overall health.
Factors include body weight, gender, food consumption, medications, rate of consumption, and individual metabolism. Empty stomach drinking can significantly increase BAC levels.
No, this calculator is for educational purposes only. The only way to ensure you're safe to drive is to not drink at all before driving. When in doubt, use alternative transportation.
At 0.02-0.05% you may feel relaxed, at 0.05-0.08% coordination begins to decline, at 0.08-0.15% significant impairment occurs, and levels above 0.15% can be extremely dangerous and potentially life-threatening.