Blood Alcohol Calculator
Estimate blood alcohol content (BAC) using the Widmark formula.
1 standard drink = 14g pure alcohol (e.g., 355ml beer, 148ml wine, 44ml spirits)
Estimated Blood Alcohol Content
0.00
0.02
0.08
0.15
0.30+
Important: This is an estimate only. Many factors affect BAC.
Never drink and drive. Even small amounts impair driving ability.
Fill in your details to estimate your blood alcohol content.