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Blood Alcohol Content Calculator
Estimate Blood Alcohol Content (BAC) from drinks, weight, and time.
Your Details & Drinks
Unit
Drinks consumed
Beer (355 ml, 5%)
Wine (150 ml, 12%)
Spirits (45 ml, 40%)
Custom drink
Volume (ml)
ABV (%)
Count
Results
Enter your details and drinks, then tap Calculate to see your estimated BAC.
About this calculator
- This tool estimates Blood Alcohol Content (BAC) using the Widmark formula.
- A standard drink is about 14 g of pure alcohol (in the US). Typical examples: 355 ml (12 oz) beer at 5% ABV, 150 ml (5 oz) wine at 12% ABV, or 45 ml (1.5 oz) spirits at 40% ABV.
- Many factors (metabolism, food intake, medication, health conditions) affect BAC. Results are estimates only.
- Formula: BAC ≈ grams / (r × weight_kg × 10) − 0.015 × hours; r ≈ 0.68 (male), 0.55 (female).
- Alcohol density is assumed to be 0.789 g/ml; standard drink ≈ 14 g.
This is not medical or legal advice. Do not rely on this to determine your ability to drive or operate machinery.