Free Tool

BAC Estimator

Estimate your blood alcohol concentration using the Widmark formula. This is an estimate only - actual BAC depends on many individual factors. Never drive if you have been drinking.

Number of Standard Drinks

One standard drink = 12 oz beer (5%), 5 oz wine (12%), or 1.5 oz spirits (40%)

Body Weight (lbs)

Biological Sex

Used for the Widmark factor in BAC calculation

Hours Since First Drink

This estimate is based on the Widmark formula and is for informational purposes only. Actual BAC is affected by metabolism, food consumption, medication, and other individual factors. This tool does not constitute medical or legal advice. Do not drive after drinking.

What Would a DUI Cost You?

See the full financial cost of a DUI in your state, including fines, attorney fees, and insurance.

Calculate My DUI Cost

BAC Reference

0.02%Light effects, relaxation

0.05%Utah legal DUI limit

0.08%Legal DUI limit (49 states)

0.15%Aggravated DUI threshold (most states)

0.20%Super extreme DUI (some states)