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 Panasonic ZS40 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). Panasonic ZS40 has external dimensions of 111 x 64 x 34 mm (4.37 x 2.52 x 1.34″) and weighs 240 g (0.53 lb / 8.47 oz) (including batteries).
Below you can see the front view size comparison of Nikon S6100 and Panasonic ZS40. Nikon S6100 is clearly the smaller of the two cameras. Its body is 13mm narrower, 6mm shorter and 7mm thinner than Panasonic ZS40.
Here is the back view size comparison of Nikon S6100 and Panasonic ZS40.
Now lets look at the top view comparison of Nikon S6100 and Panasonic ZS40.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon S6100 is significantly lighter (65g ) than the Panasonic ZS40 which may become a big advantage especially on long walking trips.
Unfortunately neither Nikon Coolpix S6100 nor Panasonic Lumix DMC-ZS40 (Lumix DMC-TZ60) 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 Panasonic ZS40'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.