Widmark Formula BAC Calculator
Estimate blood alcohol content from drinks, weight, and time elapsed
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
This tool estimates your Blood Alcohol Content (BAC) using the Widmark formula, based on your gender, weight, the type and number of drinks consumed, and hours elapsed since drinking. It calculates alcohol intake from standard volumes and proof for soju, beer, makgeolli, and whiskey, then applies an hourly elimination rate to show your current estimated BAC alongside a rough legal-status indicator. All calculations run entirely in your browser and nothing is sent to a server.
How to use
- Enter your gender and weight (kg).
- Select the type of drink you consumed and the number of glasses.
- Enter the hours elapsed since drinking.
- Check the estimated BAC and legal status shown at the top of the page.
FAQ
- Does this give the same reading as an actual breathalyzer?
- No. The Widmark formula is a statistical estimate; actual BAC depends heavily on individual metabolism, body composition, and drinking pattern, so results can differ meaningfully from a real test.
- Is it safe to drive if my result is under the legal limit?
- No. This is only an estimate — real blood alcohol levels vary by person and change continuously. Never drive after drinking, regardless of the calculated number.
- Is my input data stored or sent anywhere?
- No. All calculations happen locally in your browser; nothing is transmitted to or stored on a server.