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 Ricoh WG-6 and Nikon D5100 side-by-side from the front, back and top in their relative dimensions. Ricoh WG-6 has external dimensions of 118 x 66 x 33 mm (4.65 x 2.6 x 1.3″) and weighs 246 g (0.54 lb / 8.68 oz) (including batteries). Nikon D5100 has external dimensions of 128 x 97 x 79 mm (5.04 x 3.82 x 3.11″) and weighs 560 g (1.23 lb / 19.75 oz) (including batteries).
Below you can see the front view size comparison of Ricoh WG-6 and Nikon D5100. Ricoh WG-6 is clearly the smaller of the two cameras. Its body is 10mm narrower, 31mm shorter and 46mm thinner than Nikon D5100. As you can tell, actually this is not a fair size comparison since Ricoh WG-6 has a built-in lens but Nikon D5100 doesn't. Once you put a lens on D5100, its thickness will increase significantly.
Here is the back view size comparison of Ricoh WG-6 and Nikon D5100.
Now lets look at the top view comparison of Ricoh WG-6 and Nikon D5100.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Ricoh WG-6 is significantly lighter (314g ) than the Nikon D5100 which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on D5100, the total kit will weigh much higher.
LCD Screen Size and Features
Ricoh WG-6 and Nikon D5100's LCD screens has the same diagonal size of 3.00".
On the other hand, Nikon D5100 sports a Fully Articulated screen
which you can change the angle and position of the screen almost freely, making it possible to shoot from waist or over the head levels, and especially very useful for shooting selfies and video. Ricoh WG-6's LCD screen is a fixed type which provides almost no flexibility in shooting positions compared to D5100.