Blood Alcohol (est.)
Give a very rough blood-alcohol estimate from standard drinks, body weight, hours elapsed and sex using a Widmark-style formula. It cannot account for food, metabolism or drink strength and must never be used to decide whether to drive. Informational only, not medical or legal advice.
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💡 Good to know: Your liver clears alcohol at a roughly fixed rate — coffee, food and cold air don't speed it up.
Worked example
Est. BAC: 0.047206% · Compared with .08: below .08 on this estimate — an estimate cannot tell you it is safe to drive
Inputs
- Std drinks
3 - Weight kg
80 - Hours
2 - Sex
Male / Female
Frequently asked
Can I trust this to drive?
Absolutely not. This is a crude estimate with a wide error margin — never use it to judge fitness to drive or operate machinery.
What is a 'standard drink'?
Here it's assumed to contain about 14 grams of pure alcohol, roughly a 12 oz beer, 5 oz wine or 1.5 oz spirit.