The purpose of this study was to determine if maximum oxygen consumption (Vo(2) max) could be predicted from independent variables measured during the administration of the Canadian Home Fitness Test. Fifty-nine subjects between the ages of 15 and 74 years underwent the fitness test and a progressive exercise treadmill test for the direct determination of volitional Vo(2) max. The results indicated that Vo(2) max could be adequately predicted by the following regression equation: Vo(2) max (ml/kg.min) = 42.5 + 16.6(Vo(2)) - 0.12(W) - 0.12(H) - 0.24(A), where Vo(2) is the average oxygen cost of the last completed exercise stage (in l/min), W is the body weight (in kg), H is the postexercise heart rate (in beats/min) and A is the age (in years).