Overview

The Blood Alcohol Concentration (BAC) Calculator uses the Widmark formula to estimate BAC based on the amount of alcohol consumed, body weight, sex, and elapsed time. In South Korea, the legal limit for driving is BAC 0.03%; in the US, it is 0.08%.

Formula

BAC (%) = [drink volume (mL) × ABV (%) × 0.7894] / [weight (kg) × Widmark factor (male 0.68, female 0.55) × 1000] - (hours elapsed × 0.015) | Example: Male 70 kg, 2 shots soju (90 mL × 16.9%) → pure alcohol ≈ 12 g, BAC ≈ 0.025% (immediately after)

How to Use

1. 1Enter your sex and weight in kilograms.
2. 2Enter the type, quantity, and ABV of the beverages consumed.
3. 3Enter the time elapsed since you started drinking.
4. 4Click 'Calculate' to view your estimated BAC.

Tips

• ✔Results are estimates only — actual BAC varies based on food intake, liver function, medications, and other factors.
• ✔South Korea DUI thresholds: BAC 0.03% license suspension, 0.08% license revocation and criminal charges.
• ✔Even small amounts of alcohol can impair driving ability. Never drive after drinking.
• ✔This calculator is for educational and reference purposes only. Do NOT use it to determine fitness to drive.

FAQ