Widmark Formula BAC Calculator
Estimate blood alcohol content from sex, body weight, drinks, and time elapsed
Enter your sex, body weight, what and how much you drank, and how long ago, and this tool estimates your blood alcohol content (BAC) using the Widmark formula. It calculates your alcohol intake from the standard serving size and ABV of soju, beer, makgeolli, and liquor, factors in your hourly elimination rate, and shows your current estimated BAC alongside whether it would meet Korea's license suspension or license revocation thresholds. Everything is calculated in your browser and nothing is sent to a server.
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
How to use
- Enter your sex and body weight in kilograms.
- Choose what you drank — soju, beer, makgeolli, or liquor — and how many glasses.
- Enter how much time has passed since you finished drinking.
- Check your estimated BAC and how it compares to the legal thresholds, shown at the top of the screen.
FAQ
- Will this match what a real breathalyzer reads?
- No. The Widmark formula is an estimate built on statistical averages, and your actual BAC can differ substantially based on your body composition, metabolism, and drinking habits. Treat the result as a rough reference only.
- If the result comes in under the legal limit, am I okay to drive?
- No. The number is only an estimate, real blood alcohol levels vary widely between individuals and keep changing over time. Never drive after drinking, no matter what this calculator says.
- Is anything I enter stored or sent anywhere?
- No. Every calculation happens entirely in your browser — nothing is transmitted or saved.