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BAC Calculator

Estimate blood alcohol concentration using a Widmark-style model.

BAC Calculator Inputs

Results computed instantly — your data never leaves your device.

Live BAC Calculator Results

Real-Time

Estimated BAC (%)

0.268

Widmark-style estimate; never use it to decide whether to drive.

Estimated peak BAC (%)

0.343

100% Client-SidePrivate & Secure

How to Use the BAC Calculator

  1. 1

    Enter alcohol grams, body weight, elapsed hours, and sex.

  2. 2

    Check units and assumptions.

  3. 3

    Review the Widmark-style estimate.

  4. 4

    Never use the result to decide whether to drive.

Formula & Mathematical Basis

BAC estimate = max(0, alcohol grams ÷ (body weight grams × r) × 100 − 0.015 × hours)

Variable Key

A

Alcohol consumed in grams

W

Body weight in grams

r

Distribution factor, 0.68 male or 0.55 female

📝 This is an uncertain educational estimate and not a forensic measurement.

Step-by-Step Examples

1

Widmark-style estimate

Scenario: Enter grams of ethanol, weight, elapsed hours, and sex.

  1. 1.Convert weight to grams.
  2. 2.Apply the distribution factor.
  3. 3.Subtract assumed elimination.
  4. 4.Review the estimate with caution.
✅ Peak and elapsed-time estimates are shown.

Practical Use Cases

  • Education about assumptions in BAC models.

Common Pitfalls

  • Confusing beverage volume with ethanol grams.
  • Ignoring absorption variability.
  • Using any estimate to justify driving.

Frequently Asked Questions

Can this determine legal impairment?

No.

Should I drive after a low result?

Never use a calculator to make that decision.

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