Health & Fitness
Blood Alcohol Calculator
Estimate blood alcohol content and impairment level.
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
Frequently asked questions
What is a standard drink?
A standard drink contains about 14 grams of pure alcohol.
Is this legally accurate?
No. BAC varies by individual and circumstances. Use it only as a guide.
Does it include food?
No. Food can affect BAC; this calculator does not account for it.
Related tools
About this tool
Inputs
- Weight
- Standard drinks
- Hours since first drink
- Sex
Results
- Estimated BAC
- Status
The Blood Alcohol Calculator is built for anyone who needs a quick, reliable answer. Enter your numbers and let the formula do the heavy lifting. The required inputs are weight, standard drinks, hours since first drink and sex. Once provided, the result — estimated bac and status — appears instantly. Basal metabolic rate estimates use equations like Harris-Benedict or Mifflin-St Jeor, which factor in age, sex, height, and weight.
Health metrics give you a snapshot of where you stand, but they are not a diagnosis. Measure consistently — same time of day, same conditions — for the most reliable comparisons. The ability to estimate blood alcohol content and impairment level comes up more often than most people expect — in professional work, academic projects, and everyday planning. Individual variation means two people with identical numbers can have very different health profiles. Run the calculation with your best-case and worst-case assumptions to bracket the likely outcome. Athletes and pregnant individuals may fall outside standard reference ranges without any health concern.