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Alcohol Elimination Time Calculator

Estimate how long it will take for your body to fully eliminate alcohol based on your current BAC.

Result

Estimated Time to BAC 0.00%
5h 20m

Uses the widely cited average elimination rate of about 0.015% BAC per hour, based on typical liver metabolism speed. This rate is relatively fixed regardless of coffee, cold showers, or exercise - none of those speed up alcohol elimination, despite common belief. Never drive based on a calculated estimate; use this for general awareness only.

About the Alcohol Elimination Time

Estimates how long it will take for a given blood alcohol concentration (BAC) reading to reach 0.00%, based on the average rate at which the liver metabolizes alcohol. It's meant purely as a general awareness tool, since actual elimination speed varies by person and can't be sped up by coffee, food, or exercise.

How It Works

Enter your current BAC percentage. The calculator divides that value by a fixed elimination rate of 0.015% per hour, the commonly cited average rate at which BAC declines, then converts the resulting decimal hours into a whole hours and minutes figure.

Hours to BAC 0.00% = current BAC / 0.015. Hours shown = floor of that value. Minutes shown = round((hoursToZero - hours) x 60).

Formula & Methodology

To calculate by hand, take your BAC, for example 0.08, and divide by 0.015 to get 5.333 hours. The whole number, 5, becomes the hours; the leftover 0.333 multiplied by 60 gives 20 minutes, so the result reads as 5 hours 20 minutes.

Examples

BAC of 0.08%

A BAC of 0.08% divided by 0.015 gives 5.333 hours, displayed as 5h 20m until reaching 0.00%.

BAC of 0.12%

A BAC of 0.12% divided by 0.015 comes out to exactly 8 hours, displayed as 8h 0m.

Advantages

  • Converts a raw BAC percentage into a plain hours and minutes estimate that's easier to reason about than a decimal.
  • Uses a single, consistently applied elimination rate, so results are reproducible and comparable across different BAC inputs.
  • States plainly in its own note that common myths like coffee or cold showers don't change the outcome.

Common Mistakes

  • Treating the estimate as precise enough to decide it's safe to drive, when actual elimination rates vary by individual and the tool explicitly warns against this use.
  • Assuming any remedy can shorten the calculated time, when the underlying rate stays fixed no matter what's tried.
  • Entering a guessed BAC instead of an actual breathalyzer or blood test reading, which undermines the accuracy of the output from the start.

Edge Cases to Watch For

  • A BAC entry of 0 or below returns a No measurable alcohol in system message instead of a time estimate, since dividing by the elimination rate wouldn't be meaningful at zero.
  • The 0.015% per hour rate is a fixed population average applied regardless of body weight, sex, food intake, or liver function, all of which affect actual elimination speed in reality.
  • Because minutes are rounded to the nearest whole minute, a result very close to a full extra hour can round up to display 0 minutes rather than 59.

Common Use Cases

  • Someone wanting a rough sense of how many hours separate their current state from a fully sober baseline.
  • People comparing how the estimate changes across different starting BAC values, for general educational purposes.
  • Anyone who wants to understand the math behind commonly cited hours-to-sober-up guidance.
Written & fact-checked by the Calculateus TeamLast updated August 5, 2026How we verify our formulas

Frequently asked questions

Does drinking coffee or taking a cold shower speed up alcohol elimination?

No - the liver metabolizes alcohol at a relatively fixed rate regardless of these common folk remedies, which may make someone feel more alert but do nothing to actually lower their BAC faster. The only thing that reliably reduces BAC is time, which is why waiting is the only real solution and why this estimate should never be used to judge whether it's safe to drive.

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Conclusion

This calculator applies the standard average liver metabolism rate to a BAC figure to produce a straightforward elimination time estimate. It is intended for general awareness only and should never be used as the basis for deciding whether to drive.

References