Relationships between live weight and body measurements such as body length, wither height, heart girth, heart dept, hip height and hip width, were studied using data from 29 head Simmental beef cattle reared on the high steppe grassland. Live weight was regressed on the body measurements. Linear, quadratic and cubic effects of heart girth indicated that heart girth measurements would be useful in predicting live weight (R2= 88.0, 89.8 and 90.8%, respectively). Similarly, regression of body length including linear, quadratic and cubic effects, R2 values were obtained 82.2, 83.9 and 84.0%, respectively and linear effect was found statistically significant (P<0.05). The regression equation which is including all body measurements, R2 value was found 95.1%. The regression of live weight on heart girth had high R2 (88.0%), followed by body length (82.2%). The regression equations including both heart girth and body length was found with high R2 value (93.8%). The correlation coefficient between body weight and body measurements were found to be the highest in heart girth and body length (r= 0.94 and 0.91, respectively). It was concluded that body measurements would be useful in predicting live weight of Simmental cattle on grazing conditions. However, heart girth and body length measurements were the best prediction parameters to be used for bodyweight prediction.