What Is the BAC Calculator?
A BAC calculator estimates the alcohol concentration in your blood after drinking.
How Does the BAC Calculator Work?
It applies the Widmark formula, dividing the pure alcohol by body weight and a sex constant, then subtracting the alcohol metabolised over time.
BAC Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
The Widmark formula spreads the pure alcohol over body water (weight × sex constant) and subtracts the amount metabolised over time.
How to Use the BAC Calculator
- Enter your sex, weight, number of standard drinks and hours since the first drink.
Step-by-Step Example Calculation
Male, 160 lb, 3 drinks, 1 hour
Input Values:
Understanding Your Result
The result is an estimated BAC percentage, with time to sober and a limit check.
Factors That Affect the Result
- Body weight, sex, drink strength, drinking speed and food all affect BAC.
When Should You Use This Calculator?
- Use it for education, not to judge fitness to drive.
Assumptions & Limitations
- Assumes average metabolism and standard drinks; individual results vary widely.
Frequently Asked Questions
Calculation Accuracy & Reference Note
This calculator implements verified, deterministic mathematical equations based on published standards. Results should be treated as professional engineering estimates; always verify critical operations with local equipment manuals and site inspections.