Alcohol Consumption and BAC Calculator
Estimate blood alcohol content and safe drinking limits.
Alcohol Consumption and BAC Calculator
Estimate blood alcohol content and safe drinking limits.
BAC is an estimate only. Never drive after drinking. Laws vary by region.
How This is Calculated
Blood Alcohol Content (BAC) is estimated using the Widmark formula: BAC = (alcohol consumed in grams) ÷ (body weight kg × distribution ratio r) − (elimination rate × hours). r = 0.68 for men, 0.55 for women. Alcohol is metabolized at ~0.015 BAC/hour (approx. one standard drink/hour).
Disclaimer: This tool provides estimates for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
How to Use This Calculator
This calculator estimates your Blood Alcohol Content (BAC) based on your weight, gender, drinks consumed, and time elapsed.
- Step 1: Enter your weight, biological sex, and number of standard drinks.
- Step 2: Enter the number of hours since you started drinking.
- Step 3: Click "Calculate BAC" to see your estimated BAC and impairment status.
Frequently Asked Questions
In most countries, a standard drink contains approximately 10–14 grams of pure alcohol — roughly equivalent to a 330ml beer (4%), 150ml wine (12%), or 30ml spirits (40%).
This is a mathematical estimate. Actual BAC varies with food consumed, medications, individual metabolism, and other factors. Never rely on this to determine fitness to drive.
The liver processes approximately 0.015 BAC per hour. There is no reliable way to speed up this process.
