Blood Alcohol Calculator

By CalculatorInn Team · Updated: 2026-03-22 · Free & accurate · Instant results

BAC Calculator

Interactive Blood Alcohol Calculator

JavaScript is required for the interactive calculator. Enable JavaScript to use this tool.

How to Use This Calculator

Step-by-Step Instructions

  1. Enter your number of standard drinks
  2. Enter your body weight (lbs)
  3. Enter your gender
  4. Enter your male
  5. Enter your female
  6. Enter your hours since first drink
  7. Enter your estimated bac
  8. Enter your status
  9. Enter your legal limit (0.08%)
  10. Enter your time to 0.00%
  11. Results appear instantly — no button needed

Formula

Mathematical Formula

BAC = (Drinks × 14g) / (Weight × Gender Factor) × 100 − (Hours × 0.015)

How It Works

BAC = (Drinks × 14g) / (Weight × Gender Factor) × 100 − (Hours × 0.015)

Frequently Asked Questions

How does this work?

Enter values and get instant results using the formula shown.

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