Blood Alcohol Content (BAC) Estimator
Enter your body weight, number of standard drinks, sex and hours since your first drink for a rough BAC estimate.
Blood Alcohol Content (BAC) Estimator
Estimate blood alcohol content using the Widmark formula.
This is a rough mathematical estimate, not a measurement. Never use this to decide whether it is safe to drive — actual BAC varies with metabolism, food intake, medication and more. If impaired, do not drive.
Enter your body weight, number of standard drinks, sex and hours since your first drink for a rough BAC estimate.
Example
- With the default values shown above, this calculator returns: Alcohol Consumed ≈ 28g; Estimated BAC ≈ 0.044%.
Frequently Asked Questions
Is this an accurate way to know if I can drive?
No. This is a rough estimate only — never use it to decide whether it's safe to drive. Actual BAC depends on many factors this formula can't capture.
What formula is this based on?
The Widmark formula, a classic (and approximate) method for estimating blood alcohol content.
Sources
- Widmark formula