Measure consistently
Enter the actual serving volume and ABV, not a generic drink name. A U.S. standard drink contains about 14 g of pure alcohol.
Widmark alcohol estimate with uncertainty
Estimate alcohol exposure—never fitness to drive.
Convert beverage volume and ABV into pure ethanol, estimate a theoretical Widmark maximum, show three elimination scenarios and display urgent overdose warning signs.
The calculation runs locally in this browser. Educational outputs do not replace professional assessment, diagnosis, treatment or emergency care.
Method and interpretation guide
Use the BAC result as a transparent estimate
Enter the actual serving volume and ABV, not a generic drink name. A U.S. standard drink contains about 14 g of pure alcohol. The worksheet exposes its assumptions so the result can be checked instead of accepted as a black box.
Read the assumptions
The Widmark model assumes absorbed alcohol and a central body-water factor. Food, serving error, absorption, illness, medication and individual distribution create uncertainty beyond the displayed elimination range.
Escalate important decisions
A calculator cannot examine symptoms, medical history, medication effects or measurement quality. Use qualified professional guidance when the decision has health consequences.
Local calculation
Inputs are processed in this browser. No account or external calculator is required to produce the result.
False precision
Extra decimal places do not remove biological variation, input error or limits in the underlying population equation.
Scope
The Widmark model assumes absorbed alcohol and a central body-water factor. Food, serving error, absorption, illness, medication and individual distribution create uncertainty beyond the displayed elimination range.
Simple by design
Three steps to a clearer number.
Enter your details
Use realistic values in each field. You can change them anytime.
Calculate instantly
The formula runs locally, so there is no account or waiting time.
Use the result
Treat the answer as a practical estimate for your next decision.