⌘K

BAC Calculator

Estimate Blood Alcohol Concentration level based on weight, gender, and drinks.

Profile

Gender

Weight

Unit

Hours Since First Drink

1 h

Drinks

No drinks added yet.

Estimated BAC

0.000%

Neutral

Disclaimer:

This calculator uses the Widmark Formula for educational purposes only. It is an approximation. Real-world BAC is affected by metabolism, genetics, food, and medication.

NEVER drink and drive. If you feel impaired, do not drive.

Features

Personalized Metrics

Adjusts calculations based on your specific gender and body weight (kg/lbs).

Multi-Drink Support

Add multiple drinks with different ABVs and volumes to see the cumulative effect.

Sobriety Countdown

Estimates exactly how many hours it will take for your body to metabolize the alcohol.

Safety Limits

Visual indicators show if you are in the "Impaired" or "Intoxicated" range.

About BAC Calculator

The Blood Alcohol Concentration (BAC) Calculator provides an estimate of your alcohol level using the widely accepted Widmark Formula. By inputting your body weight, gender, the number of drinks consumed, and the time elapsed, this tool calculates a theoretical BAC percentage. This is a crucial tool for understanding how alcohol metabolizes in your body and estimating the time required to return to sobriety.

How to Use BAC Calculator

1
Enter Profile
Select your Gender and enter your Weight (switch between lbs/kg).
2
Add Drinks
Use the "+ Custom" button or presets to add all drinks you have consumed.
3
Set Time
Adjust the "Hours Since First Drink" slider.
4
Check Results
Review your estimated BAC and time to sobriety.

Frequently Asked Questions

Even small amounts of alcohol can impair judgment, reaction time, and coordination. It is safest not to drive at all after consuming any amount of alcohol.

No, coffee might make you feel more alert, but it does not speed up the metabolism of alcohol. Only time can lower your BAC.

The liver metabolizes alcohol at a constant rate, roughly 0.015% BAC per hour, or about one standard drink per hour.

In the US, it is roughly 14g of pure alcohol: 12oz of 5% beer, 5oz of 12% wine, or 1.5oz of 40% (80 proof) spirits.

Food in the stomach slows the absorption of alcohol into the bloodstream but does not prevent it. You will still reach the same peak BAC, just later.

It is a theoretical estimate of average metabolism. Individual factors like medication, body composition (fat vs muscle), and hydration can significantly alter actual BAC.