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BACWatch
Rough Widmark BAC estimate — never rely on it to decide whether to drive.
It estimates BAC from the amount of alcohol consumed, body weight, sex (which affects body water percentage), and time elapsed since drinking began — the body metabolizes alcohol at a roughly constant rate over time, which the formula subtracts out.
Individual metabolism, food intake, medication, and hydration all shift real BAC away from this formula's prediction — never use an estimate like this to decide whether it's safe to drive; only a certified breathalyzer or blood test is reliable for that.
Daily energy expenditure with personalised macro splits.
OpenBody mass index with healthy-range guidance.
OpenUS Navy circumference method for body fat percentage.
OpenDaily hydration target based on weight, activity, and climate.
OpenEstimated BAC
52.35 ‰
Below the 0.08% legal driving limit — do not drive if you feel impaired
Widmark formula — this is a rough estimate. Never rely on it to decide whether to drive.
What you entered
Total alcohol consumed
3 drinks × 14 g= 42.0 gWidmark formula (before elimination)
42.0 ÷ (75 kg × 1000 × 0.68 r) × 100= 0.082%Alcohol eliminated over time
0.015%/hr × 2 hours= 0.030%Estimated current BAC
0.082% − 0.030%= 0.052%Result
Estimated BAC: 0.052%
This estimate is below the 0.08% legal driving limit, but individual tolerance varies — never drive if you feel impaired regardless of what a calculator says.