BAC Calculator

Produce a rough Widmark-style blood alcohol concentration estimate from US standard drinks.

Distribution-factor estimate

Body weight (lb)

US standard drinks (14 g alcohol each)

Hours since drinking began

Your result

Complete the fields and select Calculate to see the result.

Never use an estimated BAC to decide whether to drive, work, supervise others, or undertake a risky activity. Only a valid measurement can determine BAC, and impairment can occur below legal limits.

Methodology reference: NIAAA: What Is a Standard Drink?

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