Widmark formula

BAC% = (alcohol g / (weight g × r)) × 100 − (0.015 × hours) where r = 0.68 (M) or 0.55 (F). For education only — never use to decide if you're safe to drive.

Frequently Asked Questions

Is the Blood Alcohol Calculator free to use?

Yes, the Blood Alcohol Calculator is 100% free to use. There are no subscriptions, no sign-ups, and no hidden fees.

Is my data safe when using the Blood Alcohol Calculator?

Absolutely. All calculations performed by the Blood Alcohol Calculator happen locally in your web browser. We do not store, track, or transmit your inputs or results to any server.

How accurate is the Blood Alcohol Calculator?

Our Blood Alcohol Calculator uses industry-standard formulas and methodology. You can view the exact formula and calculation logic used in the methodology section above to verify the math yourself.

Can I use the Blood Alcohol Calculator on my mobile phone?

Yes! The Blood Alcohol Calculator is fully responsive and works seamlessly on all devices including smartphones, tablets, and desktop computers.