BAC Calculator

Widmark-formula estimate of blood alcohol concentration. Educational only — actual BAC depends on many factors and only a calibrated breathalyzer gives a defensible reading.

Number of drinks

Drink size (ml)

ABV (%)

Body weight (kg)

Sex

Hours since first drink

Estimated BAC

0.040

Caution

Estimates are approximate. Use a calibrated breathalyzer (like the ones managed in SafeBlow) for any compliance decision.

Run real workplace tests

SafeBlow records, classifies and audits every breath test.