Blood Alcohol Calculator
Explore a simplified BAC estimate after absorption using explicit assumptions. Never use it to decide whether to drive.
Formula
BAC = max(0, alcohol g / (weight kg × Vd L/kg × 10) − β g/dL/h × hours).
Weight: 154 lb · Estimated BAC ≈ max(0,(35)÷((154 lb × 0.45359237 kg/lb)×(0.7)×10)-(0.015)×(2))
How to use
- Enter grams of pure alcohol and weight.
- Set distribution, elimination and elapsed hours.
- Read the estimate and its limitations.
Examples
- 35 g, 70 kg, Vd 0.5, β 0.015, 2 h: 0.070 g/dL.
Frequently asked questions
What is assumed?
Complete absorption of a single dose and constant elimination. Food, timing and individual biology cause large errors.
Does zero mean safe or legal to drive?
No. Even a zero estimate cannot establish sobriety or fitness to drive. Do not drive after drinking.
Does this replace medical advice?
For information only; it does not replace a doctor or individual assessment.
Sources
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