The amount of reticulo-rumen fill was determined on 104 beef steers ranging in weight from approximately 500 to 1100 lb. and percent carcass fat from 4 to 31%. The empty body weights were determined by deducting the fill from the full weight taken immediately prior to slaughter. A regression analysis of the data revealed that the empty body weight of beef cattle can be accurately predicted from the warm carcass weight taken at slaughter. The equation, Y = 70 + 1.45 X describes this relationship where Y is the empty body weight in pounds and X is the warm carcass weight in pounds. The correlation coefficient is 0.97, the standard error of the regression coefficient is 0.03 and the standard error of the estimate is 2.9% of the empty body weight. Fill was shown to be a more efficient predictor of dressing percent than was percent carcass fat. Percent fat had no significant effect on determining the empty body weight from warm carcass weight.