About

The Alcohol Calculator (BAC Calculator) is an online tool that estimates the concentration of alcohol in your body and shows you how long it takes to get sober. However, please note that the results are only indicative and this alcohol calculator cannot be considered proof of fitness to drive.

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Our goal is to be the primary source of all alcohol-related information for English speakers driving in Mexico—from understanding the effects of alcohol to knowing the federal 0.08%, CDMX 0.04%, and 0.0% commercial-driver limits.

We strive to provide accurate and reliable information to help tourists, expats, and English-speaking residents make informed decisions about alcohol consumption and responsible driving in Mexico.

A key part of our mission is the Alcohol Calculator, a tool designed to estimate Blood Alcohol Concentration (BAC) and provide an estimated time to sobriety based on your drinking habits.

By providing both informational resources and practical tools, we aim to promote awareness, safety, and responsible alcohol consumption in Mexico.

This tool estimates your Blood Alcohol Concentration (BAC) using the Widmark formula, which forensic toxicologists have used since 1932:

BAC = (A ÷ (r × W)) − (β × t)

• A — grams of pure alcohol. In Mexico, one standard drink contains approximately 13 g per the Secretaría de Salud (the number varies by country).
• r — Widmark factor or the proportion of water in the body: approximately 0.68 for men and 0.55 for women.
• W — your body weight.
• β — the rate at which the body burns alcohol, on average about 0.015% BAC per hour (adjustable in the calculator).
• t — hours from the first dose.

Each drink is counted as fully absorbed the moment you have it. In reality the level keeps rising for roughly 30–90 minutes after a drink, so the peak shown is usually higher than the real one and early readings are deliberately on the high side.

If you set a time for each drink, the calculator adds each one at the moment you had it and removes β per hour from the running total (never below zero), so a later drink can raise the level again.

Since elimination is almost linear, the same formula also estimates how long it takes for your BAC to return to zero. The result is only an estimate: stomach contents, medications, hydration, health, and individual metabolism change the actual value, so it can never be used as proof of sobriety.

Sources: Posey and Mozayani, ”The estimation of blood alcohol concentration: Widmark revisited” (2007); E. M. P. Widmark (1932); NHTSA.

The Alcohol Calculator (BAC Calculator) at bacalculator.com/mx/en is an online tool designed to estimate blood alcohol concentration and provide an estimated time to sobriety. This tool is intended for informational purposes only and should not be used as a substitute for professional medical, legal, or safety advice.

Results may vary depending on individual metabolism, health status, alcohol tolerance, and other factors such as food intake and hydration. The calculator does not account for the effects of body composition, illnesses, or medications (e.g., sertraline, metronidazole) on alcohol processing. We do not guarantee the accuracy, reliability, or suitability of the estimates provided in real-life situations. Calculator results should be considered general guidelines, not precise measurements.

Always make responsible decisions regarding alcohol. Never operate a vehicle, heavy machinery, or perform tasks requiring full attention after consuming alcohol. For legal or health-related questions, consult a qualified professional.

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Read more about our privacy policy here.

If you have any questions or concerns about this policy, please contact us via email at hello@bacalculator.com

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2. Use of the Alcohol Calculator This website provides an estimate of blood alcohol concentration (BAC) based on data provided by the user (weight, gender, type of drinks consumed, etc.). Calculations are indicative and should not be relied upon for legal, medical, or safety decisions. Individual differences may result in the actual blood alcohol concentration differing significantly from the given estimate.
3. Limitation of Liability We are not responsible for any actions taken based on the results of the website. Use of the website is entirely at your own risk. We are not responsible for damages, injuries, legal consequences, or losses resulting from reliance on the estimates of the alcohol calculator.
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5. Changes to Terms We reserve the right to change these terms at any time without prior notice. It is your responsibility to review the terms regularly. Continued use of the website after changes implies acceptance of the updated terms.

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