In light of the limited sample size in several of the position groups, it is difficult to make comparisons among the various formulas used for body fat determination with the measure attained using hydrostatic weighing, the traditional ‘‘gold standard’’ method. In the positions where 50% or more of the players did undergo hydrostatic weighing (offensive linemen/receivers and defensive backs) the accuracy of the skinfold measures was dependent both on the method used to calculate percentage body fat and the player position. For instance, for the offensive linemen, with the exception of the Forsyth and Sinning formula, all the other formulas calculated percentage body fat within 15% of that determined using hydrostatic weighing. In contrast, when one examines the data for the defensive backs, 3 of the formulas (Durnin and Rahaman [7], Forsyth and Sinning [8], and Wilmore and Behnke [27]) yielded calculated body fat percentages approximately 2 times greater than that determined by hydrostatic weighing, whereas the other 3 formulas yielded measures equal to (Jackson and Pollock [9]) or within 15% (Sloan [19], White et al. [25]). Thus it would appear that the accuracy of each of the skinfold formulas is also position dependent. Previous work by White et al. (25) found nonsignificant differences between measures from hydrostatic weighing and the Sloan skinfold method, although this same study also identified higher correlative values when using position-specific equations for determining lean body mass and body density in backs and in linemen. Snow et al. (22) also observed a difference across playing position in the accuracy of skinfold body fat percentage measures vs. hydrostatic weighing; however, their data indicated that the skinfold method resulted in a significant underestimation of body fat percentage as body fat percentage increased. This finding is contradictory to what was noted in the current study, although it is important to note that the Snow et al. (22) study used the Jackson and Pollock (9) skinfold equation, not the Sloan (19) equation that was used in this study to determine percentage body fat, and it also examined players from the National Football League, not college-level players. It must also be remembered that many of the skinfold equations that are used do not account for ethnic differences or differences in body fat depot deposition. The position differences that were noted in the current study with respect to the accuracy of the skinfold equations may have been a function of either one, or both, of these factors. Although the actual percentage body fat calculated differed across the 6 formulas, the trends across playing position remained relatively constant: the lineman (defensive and offensive) and linebackers were the fattest and the defensive backs the leanest. Moreover, when using a general classification scheme to describe level of fatness relative to age-related standards, the offensive linemen would have been categorized as ‘‘poor’’ using 4 of the 6 calculation formulas that were examined and the defensive backs as ‘‘good’’ (in 3 formulas) or ‘‘average’’ (in 3 formulas). This would suggest that, although the specific percentage of body fat determined by skinfold measures may vary widely across formulas, the general classification of players into categories of fatness and across playing position remains relatively consistent.