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 S31 and Nikon S5100 side-by-side from the front, back and top in their relative dimensions. 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). Nikon S5100 has external dimensions of 97 x 57 x 22 mm (3.82 x 2.24 x 0.87″) and weighs 132 g (0.29 lb / 4.66 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon S31 and the Nikon S5100. Nikon S5100 is clearly the smaller of the two cameras. Its body is 8mm narrower, 8mm shorter and 20mm thinner than Nikon S31.
Here is the back view size comparison of the Nikon S31 and Nikon S5100.
Now lets look at the top view comparison of Nikon S31 and Nikon S5100.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon S5100 is significantly lighter (53g ) than the Nikon S31 which may become a big advantage especially on long walking trips.
Weather Sealing
Thanks to the weather-sealed body of the S31, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the S5100.
LCD Screen Size and Features
Nikon S31 and Nikon S5100's LCD screens have the same diagonal size of 2.70 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.