Sony HX300 weighs 623 g and has external dimensions of 130 x 93 x 103 mm (5.1 x 3.67 x 4.06″). Considering that the average weight of DSLR-Like type cameras is 591g, its weight is about average in its class. With a thickness of 103mm, it also has an average thickness.
Here is the front and top view image of Sony HX300 with the dimensions:
In order to give you a better idea about the real life size of Sony HX300, we have added an image of how it looks next to a credit card and an AA type battery.
Now let's compare Sony HX300 size with the camera that it replaced: Sony HX200V. Sony HX200V is clearly the smaller of the two cameras. Its body is 8mm narrower, 6mm shorter and 10mm thinner than Sony HX300.
Below you can find the comparison of the weight and thickness of Sony HX300 with its main competitors:
Sony HX300 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 Bridge Cameras with Weather Sealing page.