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Not for driving decisions
This tool must never be used to determine whether you are fit to drive, operate machinery, or perform any safety-critical task. Always err on the side of caution. If in doubt, do not drive.
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Estimates only — not clinical
BAC figures produced here are mathematical estimates based on the Widmark formula. They are not a substitute for breath analysis, blood testing, or any certified clinical measurement. Actual BAC may differ significantly.
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Individual variation
Metabolism varies widely between individuals based on genetics, liver health, body composition, food intake, hydration, medications, fatigue, and hormonal cycles. No formula can account for all of these factors.
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Legal limits may differ
Displayed legal limits are general guidance only. Jurisdiction-specific rules — including stricter limits for novice drivers, commercial drivers, or certain vehicle classes — may apply. Always verify current laws in your location.
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Medications & interactions
Prescription drugs, over-the-counter medications, and supplements can significantly amplify alcohol impairment at BAC levels this tool may classify as low. Consult a healthcare professional if you take any medication.
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Educational purpose only
This calculator is designed to support general health awareness and education about how alcohol affects the body. It is not intended to encourage drinking, and provides no assurance of sobriety or legal compliance.
By using this tool you acknowledge that the results are estimates with known limitations and accept full responsibility for any decisions made. The creators of this calculator accept no liability for decisions made based on these estimates, including but not limited to driving, operating machinery, or any other activity where impairment may cause harm to yourself or others. In an emergency, call your local emergency services immediately. If you are concerned about your relationship with alcohol, please speak with a qualified healthcare professional.