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Enter a current blood alcohol concentration (g/dL) and choose a target threshold (for example near 0.00 g/dL, 0.05 g/dL, or 0.08 g/dL for teaching comparisons). The tool applies a linear elimination slope with conservative, typical, and faster presets and shows an uncertainty band. It is not for forensic use, legal decisions, or deciding whether to drive.
Last updated: April 20, 2026
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U.S. labels often read as “0.08 BAC” meaning 0.08 g/dL. If you only have a breath estimate, treat it as uncertain.
Time until at or below 0.00 g/dL
5 h 20 min
Range (0.012–0.018 g/dL/h): 4 h 26 min – 6 h 40 min
Time until ~0.00 g/dL at this preset
5 h 20 min
Range: 4 h 26 min – 6 h 40 min
Preset slope used: 0.015 g/dL per hour.
Useful for understanding why “sleeping it off” can take longer than intuition suggests when BAC starts high—even before considering absorption still underway.
“Zero” here means the model crossing 0.00 g/dL; real detection limits and impairment are more nuanced than one number.
Switch between slower, typical, and faster elimination rates and compare the band that spans common textbook figures.
At 0.08 g/dL with a 0.015 g/dL per hour slope and a target of 0.00 g/dL, the model clears in about 5 h 20 min—with a wide real-world band above and below that estimate.
After alcohol is distributed in body water, many introductory models treat the decline of BAC as roughly linear over a few hours: subtract a fixed amount of g/dL each hour until the concentration reaches your target. We compute hours ≈ (BAC_current − BAC_target) ÷ beta for the fall phase, with beta in g/dL per hour.
Estimate BAC from drinks first with our BAC calculator or standard drink calculator.
Get a Custom Calculator for Your PlatformDividing 0.10 g/dL by 0.015 g/dL per hour gives about 6.7 hours in this simplified model. The band from 0.012 to 0.018 per hour spans roughly 5.6 to 8.3 hours—large enough that personal planning should not rely on the midpoint alone.
Share it for driver education and harm-reduction discussions
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