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 Olympus E-M10 IV and Olympus E-M10 III side-by-side from the front, back and top in their relative dimensions. Olympus E-M10 IV has external dimensions of 122 x 84 x 49 mm (4.8 x 3.31 x 1.93″) and weighs 383 g (0.84 lb / 13.51 oz) (including batteries). Olympus E-M10 III has external dimensions of 122 x 84 x 50 mm (4.8 x 3.31 x 1.97″) and weighs 410 g (0.90 lb / 14.46 oz) (including batteries).
Below you can see the front view size comparison of Olympus E-M10 IV and Olympus E-M10 III. Olympus E-M10 IV has the same height and width with Olympus E-M10 III. On the other hand, with a thickness of 49mm, it is 1mm thinner.
Here is the back view size comparison of Olympus E-M10 IV and Olympus E-M10 III.
Now lets look at the top view comparison of Olympus E-M10 IV and Olympus E-M10 III.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Olympus E-M10 IV is 27g lighter than the Olympus E-M10 III but we don't think this will make a significant difference.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you have to also take into account the lenses that you will be using with these bodies. Since both Olympus E-M10 IV and Olympus E-M10 III have the same Micro Four Thirds lens mount and Four Thirds sized sensors, lenses will not be a differentiator on total size of the system.
Unfortunately neither Olympus OM-D E-M10 IV nor Olympus OM-D E-M10 Mark III 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 Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Olympus E-M10 IV and Olympus E-M10 III's LCD screens has the same diagonal size of 3.00".
Both cameras feature Tilting screens
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels.