Blood Alcohol Content (Widmark) Calculator
This calculator uses the Widmark formula, a widely referenced method in forensic and clinical settings, to estimate blood alcohol concentration based on total alcohol consumed, body weight, biological sex, and time elapsed since drinking began.
About this calculator
Estimate blood alcohol content (BAC) using the Widmark formula based on body weight, sex, drinks consumed, and time elapsed since drinking began.
Frequently Asked Questions
What is the Widmark formula?
The Widmark formula is a scientific method used to estimate blood alcohol concentration based on the amount of alcohol consumed, body weight, biological sex (via a distribution ratio), and elimination rate over time.
Is this calculator a substitute for a breathalyzer?
No. This tool provides a rough estimate for educational purposes only and should never be used to determine fitness to drive or as a legal or medical measurement.
What counts as a standard drink?
A standard drink is typically defined as 14 grams of pure alcohol, roughly equal to a 12 oz beer, a 5 oz glass of wine, or a 1.5 oz shot of spirits.