Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Canon M6 and Canon M3 side-by-side from the front, back and top in their relative dimensions. Canon M6 has external dimensions of 112 x 68 x 45 mm (4.41 x 2.68 x 1.77″) and weighs 390 g (0.86 lb / 13.76 oz) (including batteries). Canon M3 has external dimensions of 111 x 68 x 44 mm (4.37 x 2.68 x 1.73″) and weighs 366 g (0.81 lb / 12.91 oz) (including batteries).
Below you can see the front-view size comparison of the Canon M6 and the Canon M3. Canon M6 has the same height with Canon M3. On the other hand, with a width of 112mm, it is 1 wider and also with a thickness of 45mm, it is 1mm thicker than Canon M3.
Here is the back view size comparison of the Canon M6 and Canon M3.
Now lets look at the top view comparison of Canon M6 and Canon M3.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon M3 is 24g lighter than the Canon M6 but we don't think this will make a significant difference.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you also have to take into account the lenses that you will be using with these bodies. Since both Canon M6 and Canon M3 have the same Canon EF-M lens mount and APS-C sized sensors, lenses will not be a differentiator on total size of the system.
Weather Sealing
Unfortunately neither the Canon EOS M6 nor Canon EOS M3 provides any type of weather sealing in their bodies, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Canon M6 and Canon M3's LCD screens have the same diagonal size of 3.00 inches.
Both cameras feature
Tilting screens where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels.