Widmark estimate. Actual BAC varies — never use this to decide whether to drive.
Example: Standard drinks consumed: 3 · Weight: 170 lb · Sex: Male · Hours since first drink: 2 hrs → Estimated BAC: 0.05%.
Status: Below 0.08 — impairment still possible
Hours until 0.00%: 3.3
Frequently asked questions
How do I calculate bac? Widmark estimate. Actual BAC varies — never use this to decide whether to drive. Enter your numbers above and the result updates instantly. For example: Standard drinks consumed: 3 · Weight: 170 lb · Sex: Male · Hours since first drink: 2 hrs → Estimated BAC: 0.05%.
Is this BAC Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for bac. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.