Estimate your blood alcohol concentration (BAC) based on drinks consumed, weight, gender, and time elapsed. For educational purposes only. Health data never leaves your device — every calculation runs locally in your browser.
Content reviewed October 2026 · About Toolzum
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The Widmark formula estimates BAC based on alcohol consumed, body weight, gender (body water percentage), and time elapsed since drinking started. It provides an approximate BAC percentage: defaults (male, 70 kg, 3 drinks, 2 hours) estimate 0.058%, shown as under the 0.08% limit — still an educational estimate, never a decision tool.
Standard drink equivalents: 12 oz beer (5% ABV), 5 oz wine (12% ABV), 1.5 oz spirits (40% ABV). Enter the number of standard drinks consumed.
This is a rough estimate only. Actual BAC varies with metabolism, food intake, genetics, medications, and hydration. Never use this to decide if you can drive.
No. This is an educational tool only. Do not use it to make safety decisions. If you've been drinking, do not drive.