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 S6100 and Nikon S6400 side-by-side from the front, back and top in their relative dimensions. Nikon S6100 has external dimensions of 98 x 58 x 27 mm (3.86 x 2.28 x 1.06″) and weighs 175 g (0.39 lb / 6.17 oz) (including batteries). Nikon S6400 has external dimensions of 95 x 58 x 27 mm (3.74 x 2.28 x 1.06″) and weighs 150 g (0.33 lb / 5.29 oz) (including batteries).
Below you can see the front view size comparison of Nikon S6100 and Nikon S6400.
Here is the back view size comparison of Nikon S6100 and Nikon S6400.
Now lets look at the top view comparison of Nikon S6100 and Nikon S6400.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon S6400 is significantly lighter (25g ) than the Nikon S6100 which may become a big advantage especially on long walking trips.
Unfortunately neither Nikon Coolpix S6100 nor Nikon Coolpix S6400 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
Nikon S6100 and Nikon S6400'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.