Driving limit
0.05%
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BAC Calculator (Blood Alcohol)
How many drinks puts you over the driving limit? This tool estimates BAC using the standard Widmark formula. For education only — never drink and drive.
One standard drink ≈ 14g pure alcohol (330ml beer / 150ml wine / 45ml spirits).
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Estimated BAC
Over the limit?
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Sober in approx.
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Peak BAC
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How the Widmark formula works
BAC = grams of alcohol ÷ (body water fraction × body weight in grams) − 0.015 × hours elapsed. The body metabolizes roughly 15mg% of alcohol per hour — about one standard drink per hour.
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EDUCATIONAL USE ONLY. Never drive after drinking. Actual BAC varies by metabolism, food, medications, and health. This is not medical or legal advice.