BrACs (Breath alcohol concentrations) are often converted to the corresponding BACs (blood alcohol concentrations) by multiplying a partition ratio, Q. However, according to the previous researches, it has been revealed that it depended upon the nations. So, the partition ratio (or Q-factor) of healthy Korean adult males and its correlation to some variables including TBW (total body water), BMI (body mass index), BFM (body fat mass), and PBF (percentage of body fat) were revealed. The average of partition ratio did show particular difference around 100 when the subjects were divided with two sets:​ below and above the average of TBW. The partition ratio of Korean healthy males showed 1,913 (95 % confidence interval (CI) from 1,889 to 1,937) for whole time intervals. However, when Q was averaged after peak BACs, it gave 2,011 (95 % CI range from 1,982 to 2,040). BlandAltman plots revealed the compatibility of measurement method of multi-gas analyzer, and the biases according to the partition ratios (Q=2,100 and Q=1,913) gave -0.0052 (95 % CI from -0.0059 to -0.0045) and -0.0004 (95 % CI from –0.0011 to +0.0003), respectively. From this study, the partition ratio of Korean healthy males has been reported for the first time with massive medical experiments.