Ethanol and illustrative Widmark estimate
Calculates ethanol amount, ethanol calories and an approximate concentration using a simplified model.
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Calculation
This calculation is for reference only and is not medical advice, a diagnosis or a prescription. If you have a medical condition, are pregnant, take medication or have any doubts, discuss the result with a physician or a qualified nutrition professional.
Result
- Modelled concentration
- 0.44 g/L
- Initial model concentration
- 0.74 g/L
- Mass of Pure Ethanol
- 39.5 g
- Empty Calories from Ethanol
- 280 kcal
Illustrative estimate at the entered time; not a blood or breath measurement.
Assumes instantaneous distribution of the entire dose; not a prediction of the actual peak.
Grams of absolute anhydrous ethanol consumed
Pure alcohol energy (7.1 kcal/g) excluding mixers or sugars
Average coefficients do not describe an individual. The model treats the entered amount as one dose and does not model absorption, food or drinking duration. The result cannot establish sobriety, a safe driving time or legal compliance. Even a calculated zero does not confirm absence of alcohol.
How it is calculated
Ethanol, g = volume, mL × ABV / 100 × 0.789. C0 = ethanol / (weight × r); C(t) = max(0, C0 − 0.15 × t). r = 0.68 for men and 0.55 for women.
Formula
Ethanol, g = volume, mL × ABV / 100 × 0.789. C0 = ethanol / (weight × r); C(t) = max(0, C0 − 0.15 × t). r = 0.68 for men and 0.55 for women.
Limits of the method
Average coefficients do not describe an individual. The model treats the entered amount as one dose and does not model absorption, food or drinking duration. The result cannot establish sobriety, a safe driving time or legal compliance. Even a calculated zero does not confirm absence of alcohol.
Sources of the method
- Widmark E.M.P. Die theoretischen Grundlagen und die praktische Verwendbarkeit der gerichtlich-medizinischen Alkoholbestimmung. Urban & Schwarzenberg, Berlin, 1932
- Jones AW. et al. Evidence-based survey of the elimination rates of ethanol from blood with applications in forensic casework. Forensic Sci Int, 2010
- World Health Organization. Global status report on alcohol and health. Geneva, 2024
How to use the calculation
Enter the starting values
Use actual values and the appropriate units.
Adjust the parameters
Adjust the starting assumptions for your situation.
Read the result
Consider the model limitations; a calculation is not a measurement.
Frequently asked questions
What does the calculation show?
Calculates ethanol amount, ethanol calories and an approximate concentration using a simplified model.
What limitations apply?
Average coefficients do not describe an individual. The model treats the entered amount as one dose and does not model absorption, food or drinking duration. The result cannot establish sobriety, a safe driving time or legal compliance. Even a calculated zero does not confirm absence of alcohol.
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