How we calculate

Alcohol mass in grams = beverage volume in millilitres × ABV in percent / 100 × 0.789 g/ml. A simplified Widmark model divides by body weight and a distribution factor (0.68 or 0.55), then subtracts 0.15 ‰ per hour. The promille estimate is converted to g/L using an approximate blood density of 1.055 kg/L. Absorption and individual metabolism are not modelled. Negative model values are shown as zero; a zero result does not prove sobriety.

This is not a measurement or proof of sobriety. Never use the result to decide whether to drive; if you drank, do not drive.