BAC (Blood Alcohol Content) Calculator
Estimate your blood alcohol content based on your drinks and weight.
Blood Alcohol Concentration (BAC) Calculator
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Estimate Your Blood Alcohol Content (BAC)
Our BAC Calculator provides an estimate of your blood alcohol level based on the drinks consumed, your body weight, and gender. This is for informational purposes only and should not be used to determine if it is safe to drive.
What is a BAC Calculator?
A Blood Alcohol Content (BAC) calculator is a tool that estimates the percentage of alcohol in a person's bloodstream. By inputting the number and type of alcoholic drinks consumed, along with body weight, gender, and the time over which the drinks were consumed, it provides a rough estimate of the user's BAC. It's intended for educational purposes to help people understand how different factors influence alcohol levels in the body.
How It Works: The Widmark Formula
The calculator uses a variation of the Widmark formula, a standard method for estimating BAC:
BAC = [ (Total Alcohol (g) / (Body Weight (g) × Gender Ratio)) × 100 ] - (Time (hr) × 0.015)The gender ratio (0.68 for men, 0.55 for women) accounts for differences in body water content.
Frequently Asked Questions
How do you calculate Blood Alcohol Content (BAC)?
BAC is calculated using the Widmark formula, which considers the amount of alcohol consumed, the person's body weight, and their gender. It also factors in the time elapsed since the first drink, as the body metabolizes alcohol at a relatively constant rate. Our calculator automates this formula to provide an estimate.
What is the legal BAC limit for driving in the U.S.?
In all 50 U.S. states, the legal limit for drivers aged 21 and over is a BAC of 0.08%. For commercial drivers, the limit is 0.04%, and for drivers under 21, there are zero-tolerance laws, meaning any detectable amount of alcohol is illegal.
How long does it take for alcohol to leave your system?
On average, the body metabolizes alcohol at a rate that lowers BAC by about 0.015% per hour. This means that if your BAC is 0.08%, it would take over 5 hours for it to return to zero. Nothing can speed up this process.
How many drinks is a 0.08 BAC?
The number of drinks to reach a 0.08% BAC varies greatly depending on gender, body weight, type of drink, and time. For an average 180-pound man, it might take 4-5 standard drinks in an hour, while for a 140-pound woman, it could be 2-3 drinks. Use our calculator for a personalized estimate.
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