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 Nikon S9100 and Nikon S31 side-by-side from the front, back and top in their relative dimensions. Nikon S9100 has external dimensions of 105 x 62 x 35 mm (4.13 x 2.44 x 1.38″) and weighs 214 g (0.47 lb / 7.55 oz) (including batteries). Nikon S31 has external dimensions of 105 x 65 x 42 mm (4.13 x 2.56 x 1.65″) and weighs 185 g (0.41 lb / 6.53 oz) (including batteries).
Below you can see the front view size comparison of Nikon S9100 and Nikon S31. Nikon S9100 has the same height with Nikon S31. On the other hand, with a width of 62mm, it is 3 narrower and also with a thickness of 35mm, it is 7mm thinner than Nikon S31.
Here is the back view size comparison of Nikon S9100 and Nikon S31.
Now lets look at the top view comparison of Nikon S9100 and Nikon S31.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
LCD Screen Size and Features
Nikon S9100's 3" LCD screen is slightly larger than Nikon S31's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.