BAC Calculator
A Widmark-equation estimate of blood alcohol concentration over time, provided purely for education and harm awareness.
Details
What each level looks like
| BAC | Typical effects |
|---|
The Widmark equation
r = 0.68 for men, 0.55 for women (body water distribution ratio)
grams of alcohol = volume in ml × ABV% ÷ 100 × 0.789
elimination ≈ 0.015 percentage points per hour
Widmark works by spreading the alcohol you drank through the water content of your body and then subtracting a steady elimination rate. The two variables that matter most are how much pure alcohol you consumed and how much you weigh, because a bigger body dilutes the same amount of alcohol into a larger volume. Women generally have a lower proportion of body water, which is why the distribution ratio differs.
Why the real number will differ
This model is a rough average. Food in the stomach, drinking speed, medication, liver health, fatigue, genetics and hydration all move the result, sometimes substantially, and elimination rates vary between roughly 0.01 and 0.02 points per hour between individuals. No calculator, breath estimate or app can tell you that you are safe or legal to drive.
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