Explore a simplified Widmark blood-alcohol estimate using ethanol grams, body mass, distribution coefficient and elapsed time.
Printed from Calxy · https://www.calxy.net/health/bac-calculator
1 – 1500
0 – 500
0.3 – 1
0 – 48
0.005 – 0.04
Modelled blood alcohol concentration
0.029 g/dL (%)
Not a breath or blood test. Absorption timing, food, medications, body composition and metabolism can cause large errors. A zero estimate does not establish sobriety. Never use this result to decide whether to drive, operate machinery or perform a safety-critical activity. For signs of alcohol poisoning, seek emergency help.
Model concentration before elimination = ethanol grams ÷ (body mass in kg × distribution coefficient) ÷ 10.
Subtract assumed elimination rate × elapsed hours, with a mathematical floor of zero.
Model BAC in g/dL = ethanol grams ÷ (body mass in kg × distribution coefficient) ÷ 10 − elimination rate × hours, with a mathematical floor at zero.
With 28 g ethanol, 70 kg body mass, coefficient 0.68 and an assumed elimination of 0.015 g/dL/hour for two hours, the model gives about 0.029 g/dL. This is not a measured concentration.
No. Absorption, metabolism and inputs can produce substantial errors. Do not use this model to decide whether to drive or undertake any safety-critical activity.
Last updated . Results are estimates for informational purposes only.