Mondo Knows Tools
Blood Alcohol Calculator
Estimated blood alcohol content (Widmark formula). Use the free blood alcohol calculator below to get an instant answer, with the formula shown so you can check the maths and trust the result. Free, private, and no sign-up.
lb
A US standard drink is 0.6 oz of pure alcohol.
hrs
Mondo says
Estimated BAC
0.045
StatusUnder the US driving limit
Hours to zero3.0 hrs
Never drive after drinking. This estimate is not a sobriety test.
How it works
A rough Widmark estimate. It cannot account for food, medication, tolerance or individual metabolism, so never use it to decide whether to drive.
Blood Alcohol Calculator: common questions
- What does the Blood Alcohol Calculator work out?
- Estimated blood alcohol content (Widmark formula). It is one of the Health & Fitness tools on Mondo Knows.
- How is the Blood Alcohol Calculator calculated?
- A rough Widmark estimate. It cannot account for food, medication, tolerance or individual metabolism, so never use it to decide whether to drive.
- Do I need to sign up, and is my data stored?
- No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.
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Estimates for general guidance only. This is not financial, medical or legal advice. Everything runs in your browser and nothing you type is stored.