Blood Alcohol Content (BAC) & Sober Time Estimator
Estimate current Blood Alcohol Concentration (BAC %) and hours until sober using the Widmark formula.
- 100% free
- Private in browser
- No signup
- No watermarks
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About Blood Alcohol Content (BAC) & Sober Time Estimator
Estimate current Blood Alcohol Concentration (BAC %) and hours until sober using the Widmark formula. Enter Standard Drinks Consumed, Body Weight and Hours Since First Sip and the tool works out Current Blood Alcohol Content, Hours to Reach 0.00% Zero BAC and Legal Driving Limit straight away. Everything runs in your browser, so your data never leaves your device.
How to use Blood Alcohol Content (BAC) & Sober Time Estimator
- Enter Standard Drinks Consumed, Body Weight and Hours Since First Sip.
- Adjust the remaining options (Biological Sex) to match your case.
- Read Current Blood Alcohol Content, Hours to Reach 0.00% Zero BAC and Legal Driving Limit in the results panel — copy or download what you need.
Key features
- Shows Current Blood Alcohol Content (BAC %)
- Shows Hours to Reach 0.00% Zero BAC
- Shows Legal Driving Limit
- 4 adjustable inputs, results update as you type
- No signup, no limits
Frequently asked questions
- Is this calculation free and private?
- Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.
- What does the Blood Alcohol Content (BAC) & Sober Time Estimator give me?
- It works out Current Blood Alcohol Content, Hours to Reach 0.00% Zero BAC and Legal Driving Limit, updating live as you change the inputs.
- What do I need to enter?
- Just Standard Drinks Consumed, Body Weight, Hours Since First Sip and Biological Sex. Every field has a sensible default you can start from.
- Is my data uploaded anywhere?
- No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
- Does it work on a phone?
- Yes. The layout adapts to small screens and needs no app or signup.
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