BAC Calculator

Sex

Weight unit

Body weight in kg

Amount drunk

Total volume of the drink. A 12 fl oz beer is about 355 ml, a 5 fl oz glass of wine about 148 ml, a 1.5 fl oz shot about 44 ml.

Alcohol by volume

% ABV

Shown on the label: beer around 5, wine around 12, spirits around 40.

Time since the first drink

hours

Result

Estimate: BAC ≈ 0.045% (0.43‰)
Range depending on elimination rate: Assumption Blood alcohol
Peak without elimination 0.077% (0.73‰)
Now, with fast elimination (0.20‰ per hour) 0.034% (0.33‰)
Now, with average elimination (0.15‰ per hour) 0.045% (0.43‰)
Now, with slow elimination (0.10‰ per hour) 0.056% (0.53‰)
Working: Alcohol: 1,000 ml × 5% × 0.789 g/ml = 39.45 g.
Widmark: 39.45 g ÷ (80 kg × 0.68) = 0.73‰.
Elimination: 0.73‰ − 0.15‰ × 2 h = 0.43‰.
On paper, fully eliminated about 4.8 hours after the first drink.; A rough estimate only – never a basis for deciding to drive or operate machinery. The real value depends on how fast you drank, what you ate, your build, medication and health, and it can be considerably higher. If you have been drinking, do not drive.

Assumption	Blood alcohol
Peak without elimination	0.077% (0.73‰)
Now, with fast elimination (0.20‰ per hour)	0.034% (0.33‰)
Now, with average elimination (0.15‰ per hour)	0.045% (0.43‰)
Now, with slow elimination (0.10‰ per hour)	0.056% (0.53‰)