Blood alcohol concentration (BAC)

Blood alcohol concentration (BAC): The percentage of alcohol in the bloodstream, estimated by formula from drinks consumed, body weight, sex and elapsed time, or measured directly by breath or blood test. The BAC Calculator returns this figure from widmark: BAC % = alcohol grams ÷ (body weight (g) × r) × 100 − (hours × 0.015). At that calculator’s documented worked-example inputs the estimated blood alcohol concentration is 0.055%; holding every other input steady, moving standard drinks from 1 to 5 moves it from 0.000% to 0.112%, a spread of 0.112%. In the clinical estimates vocabulary, blood alcohol concentration (BAC) is usually read alongside standard drink and glomerular filtration rate (GFR), which are defined below.

Getting blood alcohol concentration (BAC) wrong almost always traces back to an input instead of the arithmetic, so check each figure against a statement, disclosure or official estimate before you rely on the result.