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San Diego County Personal Injury and Criminal Lawyer

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BAC Calculator (Demo)

Blood Alcohol Estimator

Estimate your BAC using the Widmark formula. Never use this to decide whether to drive.

Your drinks

0 standard drinks

Volume and ABV are pre-filled with typical values by type. Edit either to match what you actually drank (a 16 oz craft beer, a strong pour, a double). Pure alcohol is calculated from volume × ABV.

Estimated BAC
0.000%
Below all California limits

California legal limits

Drivers 21 and overStandard passenger vehicles
0.08%
Commercial driversCDL holders operating commercially
0.04%
Under 21 or on DUI probationZero-tolerance threshold
0.01%

This is an estimate only. Actual BAC depends on food, metabolism, medication, health, and the exact alcohol content of each drink, which are factors this tool does not fully account for. It is not legal or medical advice and does not mean it is safe or lawful to drive. If you have been drinking, do not drive. In California you can be charged with DUI below these limits if impaired. Charged with a DUI? Contact Rubin Law.