BAC (Blood Alcohol Content) Calculator

BAC Calculator

Body Weight (lbs):

Number of Standard Drinks:

Hours Since First Drink:

Gender:

Understanding and Using the BAC Calculator

A BAC (Blood Alcohol Content) calculator is a tool that estimates the concentration of alcohol in a person’s bloodstream based on factors like body weight, gender, drinks consumed, and time elapsed.

What Is the BAC Calculator For?

This calculator helps individuals estimate their BAC level to understand:

If they are legally over the alcohol limit to drive
How impaired they may be
When it may be safe to drive or perform tasks requiring coordination

How the BAC is Calculated

The formula is based on the Widmark formula, factoring in:

Weight (lbs)
Number of standard drinks (one drink ≈ 14g of alcohol)
Hours since first drink
Gender (affects alcohol distribution ratio)

How to Use the BAC Calculator

Step 1: Enter your body weight in pounds
Example: 160 lbs

Step 2: Enter the number of standard alcoholic drinks you’ve had
Example: 4 drinks

Step 3: Enter the hours since your first drink
Example: 2 hours

Step 4: Select your gender
This affects how alcohol is distributed in the body

Step 5: Click “Calculate BAC.”

Results You’ll See

BAC Level: e.g., 0.0725
Status: One of:
- “Sober” (BAC < 0.04)
- “Impaired” (BAC between 0.04 and 0.079)
- “Legally Intoxicated” (BAC ≥ 0.08 in most states)

Legal Reminder

Even if your BAC is under 0.08 You may still be considered impaired. This tool is an estimate and not a substitute for actual breathalyzer tests or legal judgment.

FAQ: BAC Calculator

Q1: What does BAC stand for?

A: Blood Alcohol Content – the amount of alcohol present in your bloodstream.

Q2: What is a “standard drink”?

A: A drink that contains roughly 14 grams of pure alcohol. This equals:

12 oz beer (5%)
5 oz wine (12%)
1.5 oz spirits (40%)

Q3: Is the BAC calculator 100% accurate?

A: No. It gives a rough estimate. Factors like metabolism, medications, food intake, and health can affect real BAC.

Q4: What is the legal BAC limit for driving in the USA?

A: In most states, the legal limit is 0.08% for adults over 21.

Q5: Can I use this on my phone?

A: Yes, this calculator is fully responsive and mobile-friendly.