ToolNest

🍺BAC Calculator

Calculate blood alcohol content using the Widmark formula.

🆓 Free🔒 Secure⚡ Instant📱 Mobile-friendly🚫 No signup

Calculate blood alcohol content online for free. Uses Widmark formula based on weight and drinks.

BAC: 0.043%

Slightly impaired

Estimated sober in: 2.9 hours

⚠ Estimate only. Actual BAC varies by individual. Never drink and drive.

How to Use BAC Calculator — Step by Step

  1. 1Enter your gender, body weight, and number of standard drinks consumed
  2. 2Enter the time elapsed since you started drinking
  3. 3Click 'Calculate BAC' — estimated blood alcohol content is shown
  4. 4View how many hours until your BAC returns to 0.00%

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Frequently Asked Questions

Is this tool completely free?

Yes. All ToolNest tools are 100% free with no signup required, no account, and no watermarks added to output files.

Are my uploaded files secure and private?

All uploads use HTTPS encryption during transfer. Files are processed on secure isolated servers and automatically deleted within 2 hours of upload.

Does this tool work on mobile phones?

Yes. ToolNest works on any modern browser on iPhone, Android, tablet, or desktop — no app download or plugin needed.

Do I need to create an account?

No. Just open the tool, upload your file, and download the result. No email, no signup, no password.