Nikon D80 weighs 668 g (1.47 lb / 23.56 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.
Here is the front and top view image of Nikon D80 with the dimensions:
In order to give you a better idea about the real life size of Nikon D80, we have added an image of how it looks next to a credit card and an AA type battery.
Now let's compare Nikon D80 size with the camera that it replaced: Nikon D70. Nikon D80 is clearly the smaller of the two cameras. Its body is 8mm narrower, 8mm shorter and 1mm thinner than Nikon D70.
Below you can find the comparison of the weight and thickness of Nikon D80 with its main competitors:
Nikon D80 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.