To explore the dimensional attributes of haploid and disomic X-bearing and Y-bearing spermatozoa. Morphometric evaluation of more than 2,000 X-bearing and Y-bearing spermatozoa after identification of the genotype with fluorescence in situ hybridization. Academic clinical and research andrology laboratory. Sperm head area, perimeter, long axis, short axis, shape factor, elliptical form factor (long axis/short axis), and tail length. We found no differences in dimensions or dimensional distributions between X-bearing and Y-bearing spermatozoa, whether in the native or the decondensed state, or in oligozoospermic or normozoospermic men. There were inconsistent differences and a 70% overlap in the dimensions of haploid and disomic spermatozoa. The other 30% of sperm with disomic nuclei were either smaller or larger compared to haploid spermatozoa. There are no differences, or distinguishing characteristics, in dimensions or dimensional distributions between X-bearing and Y-bearing spermatozoa. Dimensional attributes do not discriminate between dysomic and haploid spermatozoa.