Calculator Inputs and Outputs
Inputs
- Distribution factor — example: male
- Standard drinks — example: 3
- Body weight (lb) — example: 180
- Hours since first drink (hours) — example: 2
Results
- Estimated BAC
- Safety note
Formula used
A simplified Widmark estimate is used. Actual BAC varies widely; never rely on a calculator to determine driving safety.
How to Use the BAC Estimate Calculator
Enter the requested values, review the units, and select Calculate BAC Estimate. The result updates immediately using the formula below.
Formula
A simplified Widmark estimate is used. Actual BAC varies widely; never rely on a calculator to determine driving safety.
Example and Accuracy
The default values provide a working example. Change any input to calculate your own result. The calculator keeps full internal precision and rounds displayed values for readability.
Important Note
This calculator provides an informational estimate. Verify critical financial, medical, construction, scientific, or legal decisions with an appropriate qualified professional.
Calculation Standards
This tool uses documented formulas and high-precision internal values. Displayed results may be rounded for readability. Review the assumptions and verify important decisions with a qualified professional.
Read our calculation methodology