What Is My Blood Alcohol Calculator

BAC Formula:

\[ BAC = \frac{\text{grams of alcohol}}{\text{body weight} \times r} \times 100 \]

Grams of Alcohol:

grams

Body Weight:

Gender:

Hours Since Drinking:

hours

Estimated Blood Alcohol Content (BAC):

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1. What is Blood Alcohol Content?

Blood Alcohol Content (BAC) is a measure of the amount of alcohol in your bloodstream. It's expressed as a percentage representing grams of alcohol per 100 milliliters of blood. BAC is used to determine legal intoxication levels and assess impairment.

2. How Does the Calculator Work?

The calculator uses the Widmark formula:

\[ BAC = \frac{\text{grams of alcohol}}{\text{body weight} \times r} \times 100 \]

Where:

\( grams\ of\ alcohol \) — Total alcohol consumed in grams
\( body\ weight \) — Your weight in kilograms
\( r \) — Widmark factor (0.68 for males, 0.55 for females)

Explanation: The formula accounts for alcohol distribution in body water, which varies by gender and weight. The calculation also subtracts approximately 0.015% per hour for alcohol metabolism.

3. Understanding BAC Levels

Details:

0.02-0.03%: Mild euphoria, slight lightheadedness
0.05-0.06%: Reduced inhibitions, exaggerated behavior
0.08%: Legal limit for driving in most countries, impaired coordination
0.15%: Gross motor impairment, risk of injury
0.30%: Possible loss of consciousness
0.40%+: Potentially fatal

4. Using the Calculator

Tips:

Convert drinks to grams of alcohol (1 standard drink ≈ 14g alcohol)
Use your actual body weight in kilograms
Select your biological sex for accurate calculation
Include time since first drink for most accurate results

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculator?
A: It provides a reasonable estimate but individual metabolism, food intake, and other factors can affect actual BAC.

Q2: What counts as one drink?
A: 1 standard drink = 14g alcohol (12oz beer at 5%, 5oz wine at 12%, 1.5oz spirits at 40%).

Q3: How long does alcohol stay in my system?
A: The liver metabolizes alcohol at about 0.015% BAC per hour on average.

Q4: Can I sober up quickly with coffee or cold showers?
A: No, only time can reduce your BAC. These methods might make you feel more alert but don't lower BAC.

Q5: Why is the Widmark factor different for men and women?
A: Women generally have higher body fat percentage and less body water, leading to higher BAC from the same amount of alcohol.