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 Nikon S100 and Nikon P310 side-by-side from the front, back and top in their relative dimensions. Nikon S100 has external dimensions of 99 x 65 x 18 mm (3.9 x 2.56 x 0.71″) and weighs 175 g (0.39 lb / 6.17 oz) (including batteries). Nikon P310 has external dimensions of 103 x 58 x 32 mm (4.06 x 2.28 x 1.26″) and weighs 194 g (0.43 lb / 6.84 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon S100 and the Nikon P310. Nikon S100 is 4mm narrower and 14mm thinner than Nikon P310 but it is also 7mm taller.
Here is the back view size comparison of the Nikon S100 and Nikon P310.
Now lets look at the top view comparison of Nikon S100 and Nikon P310.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon S100 is 19g lighter than the Nikon P310 but we don't think this will make a significant difference.
Weather Sealing
Unfortunately neither the Nikon Coolpix S100 nor Nikon Coolpix P310 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
Nikon S100's 3.50" LCD screen is slightly larger than Nikon P310's 3 screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.