BAC EstimatorBlood Alcohol Content Calculator
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BAC Estimator
Estimate your blood alcohol content based on weight, sex, drinks, and time. Built by California DUI defense attorneys.
⚠ For educational purposes only — never use to decide if driving is safeEstimated BAC
Your Information
Drinks Consumed
Add each drink type and quantity. Standard drink = 12oz beer (5%), 5oz wine (12%), or 1.5oz spirits (40%).
How BAC Is Calculated
This estimator uses the Widmark formula — the same basis used in forensic toxicology. It accounts for body weight, sex-based distribution ratios, alcohol metabolism rate (~0.015% per hour), and food intake.
Why BAC Evidence Is Challengeable
Breathalyzer results can be affected by calibration, partition ratio variation, mouth alcohol, and test timing. Blood tests have chain-of-custody requirements. Our attorneys know how to attack each issue.
The 10-Day DMV Deadline
After a DUI arrest you have only 10 days to request a DMV hearing to contest your license suspension — completely separate from criminal court. Call us immediately after any DUI arrest.
Disclaimer: This tool provides only a rough estimate. Actual BAC varies with metabolism, medications, hydration, pour sizes, and many other factors. Never use this to decide if driving is safe or legal. Not legal or medical advice.