Canon G15 weighs 352 g (0.78 lb / 12.42 oz) and has external dimensions of 107 x 76 x 40 mm (4.21 x 2.99 x 1.57″). Considering that the average weight of Compact type cameras is 188g, Canon G15 is a significantly heavy camera for its class. With a thickness of 40mm, it is not small either, 11mm thicker than the average of its class.
Here is the front and top view image of Canon G15 with the dimensions:
In order to give you a better idea about the real life size of Canon G15, we have added an image of how it looks next to a credit card and an AA type battery.
Now let's compare Canon G15 size with the camera that it replaced: Canon G12. Canon G15 is 5mm narrower and 8mm thinner than Canon G15 but they have the same height of 76mm.
Below you can find the comparison of the weight and thickness of Canon G15 with its main competitors:
Canon G15 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.