BAC Estimate
0.058% BAC — Mild impairment
Step-by-step calculation
Formula
Widmark formula: BAC% = (alcohol_g / (weight_g × r)) × 100, where r = 0.68 (male) or 0.55 (female). Subtract 0.015% per hour for elimination.
- 1Total alcohol: 355 ml × 5% × 0.789 g/ml × 3 drinks = 42.0 g.
- 2Widmark r factor: 0.68 (male).
- 3BAC raw = 42.0 / (70.0 × 1000 × 0.68) × 100 = 0.0883%.
- 4Subtract elimination: 2 hours × 0.015%/hr = 0.030%.
- 5Final BAC: 0.0583%.
- 6US driving threshold: 0.08% in most states. Pakistan, Saudi Arabia, UAE: 0.00% (alcohol illegal). Most of EU: 0.05%.