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BAC Calculator

Health
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Estimates the percentage of alcohol in the bloodstream based on drinks consumed, weight, gender, and time.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Number of Drinks Consumed, Body Weight (lbs), Gender, and Time Passed (Hours) in the units shown.

Step 2

Read Gender Factor, Body Weight (kg), Alcohol Consumed (grams), Estimated BAC (Raw), Estimated BAC, and Rounded BAC in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Light Drinker (Male)

Number of Drinks Consumed: 1; Body Weight (lbs): 180; Gender: Male; Time Passed (Hours): 1

Gender Factor: 0.68; Body Weight (kg): 81.6467237 kg; Alcohol Consumed (grams): 16.8 grams; Estimated BAC (Raw): 30.2594902; Estimated BAC: 30.2444902 %; Rounded BAC: 30.244 %

Average Drinker (Male)

Number of Drinks Consumed: 3; Body Weight (lbs): 180; Gender: Male; Time Passed (Hours): 2

Gender Factor: 0.68; Body Weight (kg): 81.6467237 kg; Alcohol Consumed (grams): 50.4 grams; Estimated BAC (Raw): 90.77847059; Estimated BAC: 90.74847059 %; Rounded BAC: 90.748 %

Heavy Drinker (Male)

Number of Drinks Consumed: 6; Body Weight (lbs): 180; Gender: Male; Time Passed (Hours): 3

Gender Factor: 0.68; Body Weight (kg): 81.6467237 kg; Alcohol Consumed (grams): 100.8 grams; Estimated BAC (Raw): 181.5569412; Estimated BAC: 181.5119412 %; Rounded BAC: 181.512 %

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Important

Use the result as an estimate and confirm any medical decisions with a qualified professional.