Evergreen health
BAC Calculator
Estimate blood alcohol concentration from standard drinks, body weight, sex, and time since drinking began.
Interactive calculator
Estimate blood alcohol concentration
Use body weight, sex, standard drinks, and elapsed time to estimate BAC. This is an educational estimate only and is not safe for legal, driving, or medical decision-making.
Results
Estimated BAC
0.08%
Range
Impairment likely
Alcohol consumed
56 g
1 U.S. standard drink = 14 g of pure alcohol.
How to use it
- 01Enter biological sex, body weight, number of standard drinks, and hours since the first drink.
- 02Review the estimated BAC and the impairment warning band shown with it.
- 03Use the result as a cautionary estimate, not as proof of fitness to drive or work.
Result guide
- Individual metabolism, food intake, drink strength, and timing can shift real BAC materially from the estimate.
- Any detectable impairment can still make driving or safety-sensitive work dangerous before a legal limit is reached.
- A breath or blood test is the only valid legal measurement.
About this calculator
BAC tools are searched in real-world safety moments, so the page has to be blunt about scope. This version is an estimate only and should never be used to decide whether it is safe or legal to drive.
The practical value is scenario awareness: more drinks, lower body weight, and less time since drinking started usually push the estimate higher.
Frequently asked questions
Can I use this to know if I am safe to drive?
No. This calculator is only a risk estimate and should never be used to justify driving, riding, or other safety-sensitive activity after drinking.
Why is the result only approximate?
Because alcohol absorption and elimination vary with body composition, food, drink strength, medication use, and drinking pattern.
Reviewed by Dr. Elena Rostova, MD, PhD
Medical Doctor & Clinical Nutrition Researcher
Reviews health index calculators, unit converter benchmarks, and mathematical models against WHO guidelines and peer-reviewed research.
Sources: Per WHO guidelines / Peer-reviewed research/WHO BMI classification guidance/Published TDEE and basal metabolic rate formula references
Disclaimer: Calculator results are for general reference and educational purposes only per WHO standards. Health indexes and mathematical models are not a substitute for professional medical diagnosis, clinical nutrition, or certified trade advice.
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