What Is the Blood Alcohol Content (BAC) Calculator?
A mathematical estimation of blood alcohol concentration following alcoholic beverage intake.
How Does the Blood Alcohol Content (BAC) Calculator Work?
Computes total ingested ethanol, distributes it across body water volume, and subtracts metabolic hourly clearance.
Blood Alcohol Content (BAC) Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
BAC = [(Alcohol Grams / (Weight Grams × r)) × 100] − (0.015 × Hours)
Widmark pharmacokinetics accounting for gender body water distribution (r = 0.68 male / 0.55 female) and beta elimination.
How to Use the Blood Alcohol Content (BAC) Calculator
- Select biological sex, input your weight in kg, number of standard drinks, and hours since drinking started.
Step-by-Step Example Calculation
Male 80kg, 3 Drinks, 2 Hours
Input Values:
gender:male
weightKg:80
drinks:3
hours:2
Worked Steps: Yields approximately 0.047% BAC and requires ~3.1 hours until fully sober.
Understanding Your Result
Shows current estimated BAC, peak BAC, impairment severity, and time required to reach 0.00% sober.
Factors That Affect the Result
- Stomach food contents, medications, dehydration, body fat percentage, and metabolic genetics.
When Should You Use This Calculator?
- Educational harm reduction and estimating recovery timelines following social events.
Assumptions & Limitations
- Strictly educational; actual individual breathalyzer readings can differ based on gastric absorption rates.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Widmark pharmacokinetics standard forensic model.