BAC Calculator
Estimate blood alcohol concentration (educational).
Result
Results are estimates for general information only and are not professional advice.
Blood alcohol concentration
This tool estimates BAC with the Widmark formula for educational purposes only. Many factors affect real BAC, and it should never be used to decide whether it is safe to drive — never drink and drive.
Frequently Asked Questions
What is the BAC Calculator?
Estimate blood alcohol concentration (educational). It runs instantly in your browser and is completely free.
Is the BAC Calculator free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the BAC Calculator?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.