Alcohol Metabolism Calculator

• Select Gender: Choose your biological gender from the drop-down menu. This information is essential, as alcohol metabolism differs between genders.

• Enter Weight: Input your body weight in kilograms (kg). Click the button on the right to switch to pounds (lbs).

• Enter Ethanol Consumed (in g): Input the amount of ethanol consumed in grams. This is the pure ethanol content, which can be calculated from the volume and alcohol percentage of the beverages you've consumed. With the Ethanol Content Calculator you can calculate the ethanol content of the drinks you consume.

• Calculate Remaining Alcohol by Hours (optional): Enter the number of hours after your last drink to estimate the remaining alcohol concentration.

• Calculate: Click the "Calculate" button.

• Results: The results will be displayed below the input fields and include:

  • Per mille (‰): BAC expressed as parts per thousand, commonly used in Austria, Germany, Switzerland, Scandinavia and many other European countries.

  • Percentage (%): BAC converted to percentage, widely recognized in the USA, Australia, New Zealand and some Asian countries.

  • Milligrams per 100 Milliliters (mg%): A unit commonly used in medical and legal contexts, especially in the USA, Canada, India and the UK.

  • Time to Sober: An estimate of how many hours your body needs to completely metabolize the alcohol.

  • Remaining Alcohol by Hours: If you entered a specific number of hours, the estimated remaining alcohol concentration for that time frame will also be displayed.
    
    

How the BAC Calculator Works

This calculator uses the Widmark formula to estimate blood alcohol concentration (BAC). The calculation is based on the amount of ethanol consumed in grams (you can calculate this value using my Ethanol Calculator), body weight in kilograms and a gender-specific metabolism rate (0.1 g/kg/hour for women and 0.15 g/kg/hour for men). It assumes that all consumed alcohol has already been fully absorbed, which results in a theoretical maximum BAC. Why theoretical? Because alcohol absorption begins with the first sip and actual BAC can vary due to factors like liver health, metabolic rate, drinking speed or body water content. This means the BAC could be lower or, in some cases, even higher than calculated.

The results are for informational purposes only. Never drive, operate machinery or make risky decisions under the influence of alcohol.