Canon 400D weighs
556 g (1.23 lb / 19.61 oz) and has external dimensions of
127 x 94 x 65 mm (5 x 3.7 x 2.56″). Considering that the average weight of DSLR type cameras is 773g, Canon 400D is a remarkably light camera for its class. With a thickness of 65mm, it has an average thickness for its class.
Weight Comparison
DSLR Cameras
Thickness Comparison
DSLR Cameras
Here is the front and top view image of Canon 400D with the dimensions:
Front and Top View External Dimensions and Size of Canon 400D Camera Body
In order to give you a better idea about the real life size of Canon 400D, we have added an image of how it looks next to a credit card and an AA type battery.
Physical size of the Canon 400D Body Compared to a Credit Card and an AA Battery
Now let's compare Canon 400D size with the camera that it replaced: Canon 350D. Canon 400D has the same height and width with Canon 350D. On the other hand, with a thickness of 65mm, it is 1mm thicker.
Comparison image of Canon 400D and Canon 350D Size, Weight and External Dimensions - Front View
Below you can find the comparison of the weight and thickness of Canon 400D with its main competitors:
Canon 400D Size Compared to Main Competitors
Weather Sealing
Canon 400D 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.