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.

Our goal is to be the primary source of all alcohol-related information in Croatia—from understanding the effects of alcohol to knowing drink-driving limits.

We strive to provide accurate and reliable information to help people make informed decisions about alcohol consumption and responsible driving.

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 Croatia.

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 Croatia, one standard unit contains approximately 10 g (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 0.15 ‰ per hour (adjustable in the calculator).
• t — hours from the first dose.

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/hr/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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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.
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