BMI calculator
Calculate BMI (body mass index) using the WHO formula. Check whether you are underweight, normal, overweight or obese. Free BMI calculator.
Health
Calculator · Health
Blood alcohol calculator — BAC (Widmark formula)
This calculator estimates blood alcohol concentration (BAC) using the Widmark formula. Results are approximate — never use as a substitute for a breathalyzer. Never drink and drive.
How we calculate BAC (Widmark formula)
BAC (‰) = alcohol (g) / (body weight (kg) × r) − 0.15 × hours elapsed. Factor r: men = 0.68, women = 0.55. Time to sobriety = BAC / 0.15.
Example: 80 kg man, 500 ml beer (5%)
80 kg man, 500 ml 5% beer ≈ 19.7 g alcohol: BAC ≈ 0.36‰. Time to sobriety: approx. 2.4 hours.
Frequently asked questions
Indicative result
IMPORTANT: This calculator is for informational and educational purposes only. Results are approximate and do not replace a breathalyzer test. Never drive after drinking.
Related calculators
Related articles
Health · 6 min
FFMI — What It Means and How to Calculate It
FFMI is a fat-free mass index used by trainers and bodybuilders. Check the formula, reference ranges for men and women, and a worked example.
· Redakcja Liczbnik
Health · 7 min
Cutting Diet — How to Set Calories and Macros
A cutting diet is a controlled calorie deficit with adequate protein intake. See how to calculate calories and macros and avoid the most common mistakes.
· Redakcja Liczbnik
Health · 6 min
Vitamin D Supplementation — Dosage and Rules
Vitamin D affects bones, immunity, and muscles. Check recommended doses for adults, when to supplement, and what to look for when choosing a product.
· Redakcja Liczbnik