Frequently Asked Questions
What is Blood Alcohol Concentration (BAC)?
BAC measures the percentage of alcohol in your bloodstream. In many jurisdictions, the legal limit for driving is 0.08%. Even lower BAC levels can impair judgment and reaction time.
What is the Widmark formula?
The Widmark formula estimates BAC using alcohol consumed, body weight, gender, and elapsed time: BAC = (alcohol consumed / (body weight × body water constant)) - (elapsed hours × metabolism rate).
Is the calculated BAC accurate?
This calculator provides an estimate only. Actual BAC varies based on individual metabolism, food intake, medications, and overall health. Never rely solely on a calculator to determine fitness to drive.
Updated 2026 pricing