Free online blood alcohol content (BAC) calculator: estimate peak and current BAC from gender, weight, drink volume and ABV, flagged against the drink-driving and drunk-driving thresholds. For reference only — never decide whether to drive from this result; all calculated locally.
Peak blood alcohol content
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Current blood alcohol content
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Current status
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Est. time to fully sober up
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Estimate blood alcohol content with the Widmark formula: enter gender, weight, drink volume and ABV to get the peak and current levels, flagged against the national drink-driving (≥20) and drunk-driving (≥80) thresholds. For reference only — never decide whether to drive from this result; all calculated locally.
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Share this result
Create a short link so you can reopen or download the result on other devices.