Canon G12 weighs 401 g (0.88 lb / 14.14 oz) and has external dimensions of 112 x 76 x 48 mm (4.41 x 2.99 x 1.89″). Considering that the average weight of Compact type cameras is 188g, Canon G12 is a significantly heavy camera for its class. With a thickness of 48mm, it is not small either, 19mm thicker than the average of its class.
Here is the front and top view image of Canon G12 with the dimensions:
In order to give you a better idea about the real life size of Canon G12, we have added an image of how it looks next to a credit card and an AA type battery.
Now lets compare the weight and thickness of Canon G12 with its main competitors:
Canon G12 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 Compact Cameras with Weather Sealing page.