Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Casio EX-ZR15 and Canon G15 side-by-side from the front, back and top in their relative dimensions. Casio EX-ZR15 has external dimensions of 102 x 59 x 27 mm (4.02 x 2.32 x 1.06″) and weighs 176 g (0.39 lb / 6.21 oz) (including batteries). Canon G15 has external dimensions of 107 x 76 x 40 mm (4.21 x 2.99 x 1.57″) and weighs 352 g (0.78 lb / 12.42 oz) (including batteries).
Below you can see the front view size comparison of Casio EX-ZR15 and Canon G15. Casio EX-ZR15 is clearly the smaller of the two cameras. Its body is 5mm narrower, 17mm shorter and 13mm thinner than Canon G15.
Here is the back view size comparison of Casio EX-ZR15 and Canon G15.
Now lets look at the top view comparison of Casio EX-ZR15 and Canon G15.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Casio EX-ZR15 is significantly lighter (176g ) than the Canon G15 which may become a big advantage especially on long walking trips.
Unfortunately neither Casio Exilim EX-ZR15 nor Canon PowerShot G15 provides any type of weather sealing in their body, 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
Casio EX-ZR15 and Canon G15's LCD screens has the same diagonal size of 3".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.