Blood Alcohol Level Calculator
Estimate your BAC and time until sobriety
Blood Alcohol Calculator
Biological sex affects alcohol metabolism rates.
Time elapsed since you started drinking.
Standard 12oz cans or bottles.
Standard shot of spirits (vodka, whiskey, etc).
Based on your results, you might benefit from Uber / Lyft — Don't drive impaired. Get a ride home safely.
Request a RideUse our free Blood Alcohol Level Calculator to estimate your Blood Alcohol Concentration (BAC) and see how long it will likely take to become sober. This tool uses the Widmark formula to calculate levels based on your weight, gender, drinks consumed, and time elapsed. It's an essential tool for understanding how alcohol affects your body and staying safe.
How to Use This Blood Alcohol Calculator
- 1Select your gender (this affects metabolic rate constants).
- 2Enter your body weight in pounds.
- 3Input the number of hours since you started drinking.
- 4Enter the number of standard drinks consumed (Beers, Glasses of Wine, or Shots).
- 5Click Calculate to see your estimated BAC and time until sobriety.
Understanding Your Results
The results provide an **Estimated BAC** percentage and a **Time Until Sober** estimate. 0.08% is the legal driving limit in most US states. **Note:** This calculator is for educational and entertainment purposes only. Actual BAC depends on many factors including genetics, food consumption, and individual metabolism. NEVER use this tool to justify driving after drinking.
Frequently Asked Questions
This calculator uses the Widmark Formula, which is the standard scientific method for estimating Blood Alcohol Concentration (BAC). However, it cannot account for individual variations like genetics, food intake, or medication. It provides a reliable estimate but should never be used to override professional testing or judgment.
In most of the United States, the legal limit for non-commercial drivers is 0.08% BAC. For commercial drivers, it is often 0.04%. Some states like Utah have lowered their limit to 0.05%. Always checking your local laws is recommended.
On average, the human body metabolizes alcohol at a rate of roughly 0.015 grams per 100 milliliters per hour (or 0.015% BAC per hour). This means if your BAC is 0.15%, it will take approximately 10 hours to reach 0.00%. Coffee, showers, or water will NOT speed up this process.
Eating food before or while drinking can slow the absorption of alcohol into your bloodstream, potentially keeping your peak BAC lower than if you drank on an empty stomach. However, it does not increase the rate at which your liver metabolizes the alcohol you've already absorbed.
Biological sex affects alcohol metabolism primarily due to differences in body water composition and enzyme levels. Women typically have less body water than men of the same weight, meaning alcohol is less diluted in their system, leading to a higher BAC from the same amount of alcohol.
In the United States, a standard drink contains about 14 grams of pure alcohol. This is found in: 12 ounces of regular beer (5% alcohol), 5 ounces of wine (12% alcohol), or 1.5 ounces of distilled spirits (40% alcohol).
Not necessarily. Impairment begins well before 0.08%. You can be arrested for DUI (Driving Under the Influence) with a BAC lower than 0.08% if an officer determines your driving is impaired. It is always safest to drive with a BAC of 0.00%.
Online calculators are estimates based on averages. A breathalyzer measures the actual alcohol content in your breath, which correlates to your blood. A breathalyzer is significantly more accurate for determining your current state. Use online calculators only for planning and educational purposes.