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 1 J4 and FujiFilm AV250 side-by-side from the front, back and top in their relative dimensions. Nikon 1 J4 has external dimensions of 100 x 60 x 29 mm (3.92 x 2.36 x 1.12″) and weighs 232 g (0.51 lb / 8.18 oz) (including batteries). FujiFilm AV250 has external dimensions of 93 x 60 x 28 mm (3.66 x 2.36 x 1.1″) and weighs 168 g (0.37 lb / 5.93 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon 1 J4 and the FujiFilm AV250. Nikon 1 J4 has the same height with FujiFilm AV250. On the other hand, with a width of 100mm, it is 7 wider and also with a thickness of 29mm, it is 1mm thicker than FujiFilm AV250. As you can tell, actually this is not a fair size comparison since FujiFilm AV250 has a built-in lens but Nikon 1 J4 doesn't. Once you put a lens on 1 J4, its thickness will increase significantly.
Here is the back view size comparison of the Nikon 1 J4 and FujiFilm AV250.
Now lets look at the top view comparison of Nikon 1 J4 and FujiFilm AV250.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
FujiFilm AV250 is significantly lighter (64g ) than the Nikon 1 J4 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 1 J4, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Nikon 1 J4 nor FujiFilm FinePix AV250 (FinePix AV255) 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 Mirrorless Cameras with Weather Sealing Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Nikon 1 J4's 3.00" LCD screen is slightly larger than FujiFilm AV250's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.