BAC Calculator
Educational Widmark model: drinks, body weight, sex, and elapsed time → estimated BAC. Estimates vary person to person.
Estimated BAC
0.040%
- Hours until ~0.00%
- 2.7
- vs 0.08% legal limit
- Below limit
How the BAC Calculator works
The calculation follows the standard method used across the US — no shortcuts, no hidden assumptions. Here is exactly what happens behind the scenes:
Formula
BAC ≈ A×5.14/(W×r) − 0.015×hours
Frequently Asked Questions
Is this legal advice about driving?
Absolutely not. Impairment begins well below legal limits, individual metabolism varies widely, and only a breathalyzer/blood test measures actual BAC. Never drive after drinking.
What is a 'standard drink'?
US: 14 g alcohol — 12 oz beer (5%), 5 oz wine (12%), or 1.5 oz spirits (40%). Craft IPAs and heavy pours routinely exceed these.
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