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 L31 and Canon SD940 IS 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). Canon SD940 IS has external dimensions of 89 x 55 x 20 mm (3.5 x 2.17 x 0.79″) and weighs 120 g (0.26 lb / 4.23 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon L31 and the Canon SD940 IS. Canon SD940 IS is clearly the smaller of the two cameras. Its body is 7mm narrower, 4mm shorter and 9mm thinner than Nikon L31.
Comparison image of Nikon L31 and Canon SD940 IS Size, Weight and External Dimensions - Front View
Here is the back view size comparison of the Nikon L31 and Canon SD940 IS.
Comparison image of Nikon L31 and Canon SD940 IS Size and Weight - Back View
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon SD940 IS is significantly lighter (40g ) than the Nikon L31 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Nikon Coolpix L31 nor Canon PowerShot SD940 IS / Digital IXUS 120 IS provides any type of weather sealing in their bodies, 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 L31 and Canon SD940 IS'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.