Estimate your Blood Alcohol Content using the Widmark formula
Disclaimer
This is an estimate only. Actual BAC depends on many factors including food intake, metabolism, medications, and tolerance, and impairment can occur below any legal limit. Do not use this to decide whether it is safe to drive or operate machinery; when in doubt, don't. The legal limit is 0.08% in most US states and lower in many other countries (e.g. 0.05% in much of Europe and Australia, 0.03% in India).
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Frequently Asked Questions
No. Bac Calculator is free, with no signup required, and nothing you enter leaves your browser.
Bac Calculator is built on published formulas and reference ranges from established health sources. We revisit it periodically as guidance evolves; the "Last reviewed" date above shows when that last happened. If something looks wrong, tell us with the feedback button in the bottom-right corner.