Blood Alcohol Content (BAC) Estimator
Result
Blood Alcohol Content (BAC) Estimator Estimate your blood alcohol content (BAC) with the Widmark formula. Enter how many grams of pure alcohol you drank, your body weight, your sex, and how long ago you started, and this calculator returns a rough BAC per — free online calculator.
Formula
- Blood Alcohol Content (BAC) Estimator calculates its result from Hours, Alcohol G, Weight G, Rate (decimal). It uses the formula BAC% = [alcohol (g) ÷ (weight g × r)] × 100 − 0.015 × hours. Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
- The main inputs are Hours, Alcohol G, Weight G, Rate. Enter them in the units and format shown in the calculator.
- Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Blood Alcohol Content (BAC)
- Hours: 2
- Alcohol G: 3
- Weight G: 4
- Rate: 0.05 decimal
Using Hours = 2, Alcohol G = 3, Weight G = 4, Rate (decimal) = 0.05, the calculated result is 1499.97.
Sample result: Calculating…
Frequently asked questions
What does the Blood Alcohol Content (BAC) calculate?
Blood Alcohol Content (BAC) Estimator Estimate your blood alcohol content (BAC) with the Widmark formula. Enter how many grams of pure alcohol you drank, your body weight, your sex, and how long ago you started, and this calculator returns a rough BAC per — free online calculator.
Which values should I enter?
Enter Hours, Alcohol G, Weight G, Rate using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: BAC% = [alcohol (g) ÷ (weight g × r)] × 100 − 0.015 × hours.
Why might my result differ from another source?
Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.