Blood Alcohol Calculator (BAC).

Estimate your Blood Alcohol Concentration (BAC) using the Widmark formula and calculate time to sobriety

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FAQs

What is the Widmark formula?

The Widmark formula estimates BAC based on total alcohol consumed, body weight, gender, and metabolism over time.

What is the legal BAC limit for driving in the US?

In all US states (except Utah at 0.05%), the legal BAC limit for drivers 21 and older is 0.08%.

How fast does the body metabolize alcohol?

The human body metabolizes alcohol at an average rate of 0.015% BAC per hour.

Authoritative Source & Methodology

Reviewed: 2026-07-20

Source: NHTSA Widmark Formula & Alcohol Impairment Guidelines (US / International)

Reviewer: Mathify content team

Notice: Estimates blood alcohol concentration for educational purposes only. Individual metabolism, food intake, and tolerance vary. Never drive under the influence.

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