Two methods have been widely used for measuring basal metabolic rates (BMR), Douglas-Scholander (open circuit) and Sanborn-Metabulator (closed circuit ) methods. The latter has been used more by clinicians, since the Process is simple. But it is not as accurate as the Douglas-Scholander method. We measured the BMR of 938 healthy individuals who were selected at random, using a Douglas-Scholander method. The lowest value of the 6 measurments in three days was taken from each subject in the basal state. A single determination of BMR also was made with the Metabulator for 684 individuals. We applied both methods for 13 subjects among them who have same physical conditions. The results obtained were as follows: 1. The mean value of BMR with the Metabulator is significantly higher than Douglas-Scholander method by 9.2%. 2. The Metabulator can be used for measuring BMR, since the normal value is generally less than 15% of BMR. But one may considered that there is likely errors about 10% in Metabulator method.