Educational tool
DUI BAC Estimator
Estimates blood alcohol content from drinks, body weight, biological sex and time elapsed, using the Widmark formula. Real BAC varies widely between people, so the result is a rough model. For information only, never a basis for deciding whether to drive.
The calculator
For information only — never use to decide whether to drive. BAC calculations are estimates. Individual metabolism varies significantly. The only safe amount of alcohol before driving is zero.
Used for the Widmark r-factor in BAC calculation.
Estimated BAC at this point
0.064%
Below 0.08%, but impairment is still possible: a driver can be arrested at any BAC if driving is impaired.
Time until 0.08%
Already below
Time until 0.00%
4h 17m
Method: Widmark formula — assumes the drinks are absorbed at once and eliminated at 0.015% per hour on average, counted from the first drink.
Actual BAC depends on food consumption, medication, liver function, and drink-specific alcohol content. Results can vary ±30%.
Related pages
- ChartThe DUI Test Refusal ParadoxFour outcomes for people who took a breath or blood test and people who refused.
- CalculatorDUI Total Cost EstimatorAn itemized, illustrative cost of a DUI, by state and offense number.
- CalculatorDUI License-Hearing WindowThe hearing request window listed for each state, counted from a date you enter.