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"Police Notebook" BAC Calculator bac-calculatoris an Online breath-alcohol concentration calculator from the University of Oklahoma Police Department. It will estimate the concentration of Alcohol in your blood based on how much you have been drinking.

This BAC Calculator requires"JavaScript-based" to be enabled in your browser.


Number of Drinks and BAC from 1 hour of drinking

From "Police Notebook" University of Oklahoma Police Department.

bac calculator

Blood Alcohol Concentration (BAC)

Drinking alcohol affects your Blood Alcohol Concentration (BAC).

In California, it is illegal for any person to operate:

  • A motor vehicle with a BAC of 0.08% or higher.
  • Any vehicle requiring a commercial driver license (with or without a commercial driver license issued to the driver), with a BAC of 0.04% or higher.
  • A motor vehicle with a BAC of 0.01% or higher, if the person is under age 21.
  • A motor vehicle with a BAC of 0.01% or higher at any age if the person is on DUI probation.


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After DUI Arrest

4 essential steps you must take:

1. Contact the DMV
Contact the DMV within 10 days of your DUI Arrest in California

You must contact the DMV within 10 days of your DUI Arrest.

2. Get your Police Report
Get Police Report after DUI Arrest in California

Obtain and review a copy of your DUI Police Report.

3. Educate yourself
DUI Defense Legal Representation

Educate yourself - learn about
DUI Defense.

4. Plea Bargain or Trial
Plea Bargain or Trial for DUI California

Know your
options in Court - Plea Bargain or Trial.