basic

Blood Alcohol Content Calculator

Estimated BAC from drinks consumed (Widmark formula).

Estimate blood alcohol content using the Widmark formula from drinks consumed, body weight, sex, and time elapsed.

Daniel Oh By Daniel Oh
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

kg

Results

Enter values and click Calculate to see results.
Was this helpful?

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 = (drinks · 14 · 5.14) / (weight_lb · r) − 0.015 · hours, with r ≈ 0.73 (M), 0.66 (F).

In depth

Estimate blood alcohol content using the Widmark formula from drinks consumed, body weight, sex, and time elapsed.