Blood Alcohol Calculator (BAC estimate)
Estimate your blood alcohol level (g/L) using the Widmark formula.
Result
Estimated BAC (g/L)
0.42
How it works
BAC = alcohol(g) ÷ (r × weight) − 0.15 × hours
A Widmark estimate only. It varies with food, metabolism and more. A standard drink ≈ 10 g of pure alcohol. NEVER use this to decide whether to drive — if you have drunk, do not drive.
Advertisement
Frequently asked questions
How much is one standard drink?
About 10 g of pure alcohol (a small beer, a glass of wine or a shot).
Can I rely on this to drive?
No. It is an estimate only; the only safe level for driving is zero. Never drive after drinking.
Advertisement