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BAC Calculator

Blood alcohol concentration estimate.

Blood alcohol

Estimate only. Never drive impaired.

BAC
0.050%
Mild impairment
Time to sober (BAC = 0)
3.3 hr
At metabolic rate of ~0.015 %/hr
Time to under 0.08%
Already under
US legal driving limit
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BAC Calculator · Generated 5/2/2026 · calccenter.online/calculators/health/bac

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About the BAC Calculator

MethodologyHome

Blood alcohol concentration estimate. Use this free bac calculator to get instant results. All calculations run in your browser — nothing is sent to a server.

Frequently asked questions

What does this BAC Calculator do?

Blood alcohol concentration estimate.

Is it free?

Yes — every calculator on Calc Center is free, with no sign-up or account required.

Does it work offline?

The site is a Progressive Web App — after your first visit, most pages work without an internet connection.