BAC estimator
Alcohol affects everyone differently. Use the Widmark formula to estimate your Blood Alcohol Content (BAC).
Legal Disclaimer
I genuinely hope you read this: This calculator is for educational purposes only. It does not account for food in your stomach, hydration, meds, or individual metabolism. Never use an online tool to decide if you are "safe to drive." If you have to ask, you aren't. Don’t be stupid.
How the math works
This tool uses the Widmark Formula: BAC = [Alcohol consumed in grams / (Body weight in grams × r)] × 100 - (ElapsedTime × 0.015). The "r" is a distribution constant (usually 0.68 for men and 0.55 for women). We assume a standard drink contains roughly 14 grams of pure alcohol. Finally, we subtract about 0.015% per hour for the rate at which your liver processes the alcohol.
Factors humans ignore
Your stomach contents are the biggest variable. If you drink two beers on an empty stomach, your peak BAC will be much higher and hit you much faster than if you just ate a giant steak dinner. This calculator assumes an "average" state. If you haven't eaten, your real BAC could be much higher than shown here.