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Blood Alcohol Content Time-to-Sober-Up Calculator

Estimated BAC and hours until sober (Widmark simplified).

Estimates BAC using Widmark: BAC = (alcohol_g) / (weight_kg × r) − 0.015 × hours. r ≈ 0.68 males, 0.55 females. Time to zero = BAC / 0.015 h.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

g
kg
h

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

BAC = A/(Wt × r) − 0.015 × t; t_sober = BAC₀ / 0.015

In depth

Estimates BAC using Widmark: BAC = (alcohol_g) / (weight_kg × r) − 0.015 × hours. r ≈ 0.68 males, 0.55 females. Time to zero = BAC / 0.015 h.