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 Canon ELPH 150 IS and Nikon D5300 side-by-side from the front, back and top in their relative dimensions. Canon ELPH 150 IS has external dimensions of 95 x 57 x 24 mm (3.74 x 2.24 x 0.94″) and weighs 142 g (0.31 lb / 5.01 oz) (including batteries). Nikon D5300 has external dimensions of 125 x 98 x 76 mm (4.92 x 3.86 x 2.99″) and weighs 480 g (1.06 lb / 16.93 oz) (including batteries).
Below you can see the front view size comparison of Canon ELPH 150 IS and Nikon D5300. Canon ELPH 150 IS is clearly the smaller of the two cameras. Its body is 30mm narrower, 41mm shorter and 52mm thinner than Nikon D5300. As you can tell, actually this is not a fair size comparison since Canon ELPH 150 IS has a built-in lens but Nikon D5300 doesn't. Once you put a lens on D5300, its thickness will increase significantly.
Here is the back view size comparison of Canon ELPH 150 IS and Nikon D5300.
Now lets look at the top view comparison of Canon ELPH 150 IS and Nikon D5300.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon ELPH 150 IS is significantly lighter (338g ) than the Nikon D5300 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 D5300, the total kit will weigh much higher.
Unfortunately neither Canon PowerShot ELPH 150 IS (IXUS 155) nor Nikon D5300 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 DSLR Cameras with Weather Sealing
LCD Screen Size and Features
Nikon D5300's 3.20" LCD screen is slightly larger than Canon ELPH 150 IS's 2.7" screen.
Moreover, Nikon D5300 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. On the other hand, Canon ELPH 150 IS has a fixed type screen which provides almost no flexibility in shooting positions compared to D5300.