BAC Calculator

Gender

Weight (kg)

Drink

Number of Drinks

Hours Since First Drink

If you stop drinking now, you'll be back to 0.00% BAC around 9:30 AM.

Estimated BAC: 0.028%

Minimal Impairment

Mild Impairment

Impaired

Legally Intoxicated

Severe / Danger

Minimal Impairment

Below 0.03%, impairment is minimal, though reaction time may already be slightly affected.

Estimate only (Widmark formula) — never drive after drinking.

How this is calculated

Uses the Widmark formula: alcohol consumed (grams) ÷ (body weight × body-water distribution ratio), minus an average elimination rate of 0.015%/hour since drinking started. An estimate only — individual metabolism varies widely. Never drive after drinking.

Blood Alcohol Content