How to use the blood alcohol content calculator
Estimate blood alcohol content (educational estimate). Enter standard drinks (14 g), weight, distribution ratio, hours since first drink in the fields above; the estimated bac is computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- d — Standard drinks (14 g)
- w — Weight (kg)
- r — Distribution ratio (—)
- t — Hours since first drink (h)
Worked example
With standard drinks (14 g) = 3, weight = 75 kg, distribution ratio = Male, hours since first drink = 2 h, the calculator gives estimated bac ≈ 0.05235294 %.
Frequently asked questions
What is the formula for the blood alcohol content calculation?
Estimated BAC (%) = max(0,d × 14 / (w × 1000 × r) × 100-0.015 × t). Here d is standard drinks (14 g), w is weight (kg), r is distribution ratio (—), t is hours since first drink (h).
What inputs do I need for the blood alcohol content (widmark) calculator?
You need standard drinks (14 g), weight in kg, distribution ratio in —, hours since first drink in h. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.