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 L31 and Panasonic FZ40 side-by-side from the front, back and top in their relative dimensions. Nikon L31 has external dimensions of 96 x 59 x 29 mm (3.78 x 2.32 x 1.14″) and weighs 160 g (0.35 lb / 5.64 oz) (including batteries). Panasonic FZ40 has external dimensions of 120 x 80 x 92 mm (4.72 x 3.15 x 3.62″) and weighs 494 g (1.09 lb / 17.43 oz) (including batteries).
Below you can see the front view size comparison of Nikon L31 and Panasonic FZ40. Nikon L31 is clearly the smaller of the two cameras. Its body is 24mm narrower, 21mm shorter and 63mm thinner than Panasonic FZ40.
Here is the back view size comparison of Nikon L31 and Panasonic FZ40.
Now lets look at the top view comparison of Nikon L31 and Panasonic FZ40.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon L31 is significantly lighter (334g ) than the Panasonic FZ40 which may become a big advantage especially on long walking trips.
Unfortunately neither Nikon Coolpix L31 nor Panasonic Lumix DMC-FZ40 (Lumix DMC-FZ45) 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 Top Bridge Cameras with Weather Sealing
LCD Screen Size and Features
Panasonic FZ40's 3" LCD screen is slightly larger than Nikon L31's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.