The radiographic method of measuring and calculating total lung capacity (TLC) is a relatively simple procedure which can be performed by clinicians. To determine normal values of TLC radiographically in healthy normal Koreans, the author has performed measurement and calculation of TLC in 797 subjects comprizing 246 preschool children, 320 schoolchildren & adolescents and 231 adults. The results are as follows : 1. The values of TLC were greater in males compared with females of the corresponding age, height or weight. TLC tended to increase with age until age 20 and no significant change was observed there-after. The mean value of TLC in females was less than that of males amounting to 68.3% in preschool children, 77.0% in school-children & adolescents and 67.3% in adults. 2. TLC increased gradually with noted between the two variables and the confficient of correlation in preschool and school children was 0.74 and 0.86, respectively. In adults, the approximation values of T C were 1.0$ imes$Ht3 in males and 0.9$ imes$Ht3 in females. 3. No definite correlation between the TLC and the body weight in preschool children and adults in particular was observed. 4. Mean values of TLC in the adults obtained by radiographic method and physiologic method were 5,410$pm$546ml and 5,655$pm$567ml, respectively and no significant difference in the values between the two methods was demonstrable.