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 A3400 IS and Canon A4000 IS side-by-side from the front, back and top in their relative dimensions. Canon A3400 IS has external dimensions of 94 x 56 x 21 mm (3.7 x 2.2 x 0.83″) and weighs 126 g (0.28 lb / 4.44 oz) (including batteries). Canon A4000 IS has external dimensions of 95 x 56 x 24 mm (3.74 x 2.2 x 0.94″) and weighs 145 g (0.32 lb / 5.11 oz) (including batteries).
Below you can see the front-view size comparison of the Canon A3400 IS and the Canon A4000 IS. Canon A3400 IS is 1mm narrower and 3mm thinner than Canon A3400 IS but they have the same height of 56mm.
Here is the back view size comparison of the Canon A3400 IS and Canon A4000 IS.
Now lets look at the top view comparison of Canon A3400 IS and Canon A4000 IS.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon A3400 IS is 19g lighter than the Canon A4000 IS but we don't think this will make a significant difference.
Weather Sealing
Unfortunately neither the Canon PowerShot A3400 IS nor Canon PowerShot A4000 IS 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 Compact Cameras with Weather Sealing
LCD Screen Size and Features
Canon A3400 IS and Canon A4000 IS's LCD screens have the same diagonal size of 3.00 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.