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-Z450 and Sony W310 side-by-side from the front, back and top in their relative dimensions. Casio EX-Z450 has external dimensions of 81 x 56 x 21 mm (3.19 x 2.2 x 0.83″) and weighs 128 g (0.28 lb / 4.52 oz) (including batteries). Sony W310 has external dimensions of 95 x 55 x 19 mm (3.74 x 2.17 x 0.75″) and weighs 137 g (0.30 lb / 4.83 oz) (including batteries).
Below you can see the front view size comparison of Casio EX-Z450 and Sony W310. Sony W310 is 1mm shorter and 2mm thinner than Casio EX-Z450 but it is also 14mm wider.
Here is the back view size comparison of Casio EX-Z450 and Sony W310.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Casio EX-Z450 is 9g lighter than the Sony W310 but we don't think this will make a significant difference.
Unfortunately neither Casio Exilim EX-Z450 nor Sony Cyber-shot DSC-W310 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-Z450's 3" LCD screen is slightly larger than Sony W310's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.