Differences in the distribution of abdominal circumference and lower chest circumference with respect to body weight or body fat percentage may reflect the deposition of visceral fat anatomically. Clear sex differences may also be seen in the differences in this distribution. The aim of this study was to investigate the sex differences in the correlations between trunk circumference, body mass index (BMI) and body fat percentage (%BF) in university students. The data used in the analysis were from 180 young males and 744 young females. The subjects’ BMI, %BF, chest circumference, lower chest circumference, abdominal circumference, and pelvic circumference were measured. No significant sex difference was observed in BMI or pelvic circumference. Female %BF was significant higher than male %BF. Body weight, chest circumference, lower chest circumference, and abdominal circumference were significantly higher in males than in females. The correlations between the respective trunk circumferences and BMI and %BF were all significant in both males and females. All correlation coefficients were higher in males than in females. The intersection of the lower chest circumference and abdominal circumference may be a simple indicator of the inflection point for a marked increase in visceral fat in males. In females, however, the intersection was at a little earlier stage and was not a point that estimates disease risk.