Nikon D90 weighs 703 g (1.55 lb / 24.80 oz)
and has external dimensions of 132 x 103 x 77 mm (5.2 x 4.06 x 3.03″)
. Considering that the average weight of DSLR type cameras is 773g, its weight is about average in its class. With a thickness of 77mm, it also has an average thickness.
In order to give you a better idea about the real life size of Nikon D90, we have added an image of how it looks next to a credit card and an AA type battery.
Now let's compare Nikon D90 size with the camera that it replaced: Nikon D80. As depicted on the comparison image, and have the exact same height, width and thickness.
Below you can find the comparison of the weight and thickness of Nikon D90 with its main competitors:
Nikon D90 doesn't have any environmental sealings on its body so you got to be extra careful to protect it against water and dust. If you shoot under these conditions very often, consider checking Top DSLR Cameras with Weather Sealing page.