What is a BAC calculator?

A BAC calculator estimates your Blood Alcohol Content based on inputs like weight, gender, number of standard drinks and time. It provides an educational estimate, not a legal measurement.

Is the BAC estimate accurate?

It uses the Widmark formula and typical metabolism rates. Individual physiology, medications, and food intake can cause significant variation. For legal or safety-critical purposes, use a certified test.

Do you store my data?

No. All calculations run in your browser and are not uploaded or stored on our servers.

What is a standard drink?

In the U.S., one standard drink contains about 14g of pure alcohol: 12oz beer (5%), 5oz wine (12%), or 1.5oz spirits (40%).

What is the legal BAC limit?

In most U.S. states, the per se limit for non-commercial adult drivers is 0.08 BAC; many countries have different limits. Younger drivers and commercial drivers often have lower limits.

How long until I am sober?

A typical elimination rate is about 0.015 BAC per hour, but this varies. Our tool shows an estimate of time to reach 0.00 BAC.

BAC Chart by Weight - Blood Alcohol Content Calculator

Get Your Personalized BAC Estimate

While charts provide general estimates, our interactive calculator considers your specific inputs for more accurate results.

Male BAC Chart

Weight (lbs)	1 Drink	2 Drinks	3 Drinks	4 Drinks	5 Drinks	6 Drinks
120	0.04	0.08	0.11	0.15	0.19	0.23
140	0.03	0.07	0.10	0.13	0.16	0.19
160	0.03	0.06	0.09	0.11	0.14	0.17
180	0.03	0.05	0.08	0.10	0.13	0.15
200	0.02	0.05	0.07	0.09	0.11	0.14
220	0.02	0.04	0.06	0.08	0.10	0.12

Female BAC Chart

Weight (lbs)	1 Drink	2 Drinks	3 Drinks	4 Drinks	5 Drinks	6 Drinks
100	0.05	0.10	0.15	0.20	0.25	0.30
120	0.04	0.09	0.13	0.18	0.22	0.27
140	0.04	0.08	0.11	0.15	0.19	0.23
160	0.03	0.07	0.10	0.13	0.17	0.20
180	0.03	0.06	0.09	0.12	0.15	0.18
200	0.03	0.05	0.08	0.11	0.13	0.16

Chart Legend & Important Notes

Below 0.05 BAC - Minimal impairment

0.05-0.07 BAC - Noticeable impairment

0.08+ BAC - Legal intoxication (most US states)

Chart Assumptions: 1 standard drink = 14g alcohol (12oz beer 5%, 5oz wine 12%, 1.5oz spirits 40%)

Time Period: All drinks consumed within 1 hour, no metabolism time included

Individual Variation: Actual BAC can vary significantly based on food, medications, health, and metabolism

How to Use This BAC Chart

1. Find your weight range in the left column

2. Count your standard drinks consumed in one hour

3. Find the intersection to see estimated BAC

4. Remember: This is an estimate only - individual results vary

5. For accuracy: Use our interactive calculator with your specific details

Why Gender Matters in BAC

Body Composition: Women typically have less water content per pound of body weight

Metabolism: Differences in alcohol dehydrogenase enzyme levels

Hormones: Menstrual cycle can affect alcohol metabolism

Result: Women generally reach higher BAC levels than men of the same weight

Safety: Always err on the side of caution regardless of gender

Ready for a Personalized BAC Calculation?

Charts provide general estimates, but our calculator considers your specific weight, gender, drink types, ABV levels, and time drinking for more accurate results.