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Blood Alcohol Calculator

The amount of alcohol that is present in a person’s blood is referred to as one’s Blood alcohol concentration (BAC). Blood alcohol testing allows law enforcement to see how much ethyl alcohol is in a person’s bloodstream. The results are given in percentage by milligram. If someone has a blood alcohol test result of 0.08% or higher, he or she is considered intoxicated according to California law. If a person’s blood alcohol test result is slightly below 0.08%, that person still may be considered under the influence of alcohol if he or she displays certain mental and physical behaviors. Blood alcohol concentration can be measured by a person’s breath, blood, and urine.

It is important to remember that certain factors such as gender, amount of alcohol consumed, weight, type of alcohol consumed, and food consumption can directly impact the results of a blood alcohol test.

About the Drink Wheel

Click here to try the Drink Wheel

If you complete the Intoximeters Inc. "Drink Wheel"1 form, we will instantly compute your estimated blood alcohol concentration based on the information that you have provided and return that estimate to you. Intoximeters’ web site offers this service to its visitors as a public service with the purpose of providing useful information about the responsible use of alcohol.

Why is it called a "Drink Wheel"?

We call it the "Drink Wheel" because it is based on various paper and cardboard BAC calculators that are distributed in alcohol awareness programs, some of which are in the form of a wheel that you can spin to calculate your estimated BAC based on what and how much you have had to drink.


The Blood Alcohol Calculator is for information only. This conversion is not completely accurate and should not be used to determine if you are capable of driving. Your actual blood alcohol concentration may vary, depending upon many factors, including body type, sex, health status, and many others. Every effort is made to ensure that the results yielded by the Blood Alcohol Calculator are correct; however, do not rely upon this information to decide whether or not it is safe or lawful to drive. Since impairment may occur at any blood alcohol level, we can only recommend that you do not drive with any measurable amount of alcohol in your system.

Contact The Office

Mr. Tayac and the DUI investigators and experts working with him stand ready to help you or your family member. A member of the office is available to speak with you regarding the case any day of the week between the hours of 8:00 a.m. and 8:00 p.m. Pacific Standard Time at 415-552-6000.

If you hire the Law Office of Robert Tayac, you will know that you have retained the services of the most knowledgeable and experienced DUI defense team.

Why Choose Our Firm?

Attorney Robert Tayac Puts a Long, Decorated Career to Work for You
  • Puts Over 20 Years of Experience Toward Your Case

  • Specialized Education in DUI Defense

  • Has Trained Other Attorneys in San Francisco

  • Former San Francisco Police Officer & Police Inspector

  • Certified by the SFPD on the Intoxilyzer 5000 Testing Device

  • Co-Authored the 4th Edition of California Drunk Driving Defense

  • Boasts a Successful Record Achieving the Best Result for His Clients

  • Takes the Time to Understand You & Your Case

Client Testimonials

  • “I will always be eternally grateful for your help and extreme kindness.”

    T., Captain of Police

  • “I got my life back on track because Robert understands people, and he is genuinely concerned for his clients.”


  • “Thank you again Robert, and we are just hoping that we can move on and 'let it go'.”


  • “If you have a "must win," "zero sum" case and are willing to pay for his services, Robert Tayac may just be the very best DUI trial lawyer in Northern California.”


  • “Without Mr Tayac's knowledge and drive to succeed, I most likely would not be able to write this review today.”


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