Blood Alcohol Content (BAC) Calculator
Fill in the fields below to calculate
Disclaimer: This is an estimate only. Actual BAC can vary significantly. Never drink and drive. Always use a designated driver or ride service.
1 standard drink = 14g alcohol (355mL beer, 148mL wine, 44mL spirits)
Enter your values above to see the result.
Your Results
Estimated BAC
Hours Until Sober
(BAC < 0.01%)
Professional drivers: 0.05%
General drivers: 0.08%
BAC Impairment Levels
Sober
< 0.02%
Minimal to no impairment
Impaired
0.02 - 0.08%
Reduced coordination, reaction time
Legally Drunk
> 0.08%
Illegal in most jurisdictions
1
Widmark Formula: BAC = (drinks × 14g × 5.14) / (weight_lb × r) − 0.015 × hours
Where r =
2
BAC = ( × 14 × 5.14) / ( × ) − 0.015 ×
3
Hours until sober: BAC / 0.015 = / 0.015 = hours