Health

BAC Calculator

Estimate your blood alcohol concentration using the Widmark formula.

Gender

Body Weight (lbs)

Standard Drinks Consumed

Hours Since First Drink

Estimated BAC—

Impairment Level—

Time to Sober (≈0.00%)—

BAC = (Drinks × 5.14 / (Weight × r)) − 0.015 × Hours
r = 0.73 (male) or 0.66 (female)

About Blood Alcohol Content

BAC measures the percentage of alcohol in your bloodstream. In most US states, the legal limit for driving is 0.08%. BAC is affected by weight, gender, number of drinks, and time elapsed. The body eliminates alcohol at roughly 0.015% per hour.

Impairment Levels

0.02–0.03%: Mild relaxation, slight mood elevation.
0.04–0.06%: Lowered inhibitions, impaired judgment.
0.08%: Legal intoxication in most states.
0.15%+: Significant impairment, possible blackout.