Olympus E-M10 III weighs 410 g (0.90 lb / 14.46 oz) and has external dimensions of 122 x 84 x 50 mm (4.8 x 3.31 x 1.97″). Considering that the average weight of Mirrorless type cameras is 445g, its weight is about average in its class. With a thickness of 50mm, it also has an average thickness.
Here is the front and top view image of Olympus E-M10 III with the dimensions:
In order to give you a better idea about the real life size of Olympus E-M10 III, we have added an image of how it looks next to a credit card and an AA type battery.
Now let's compare Olympus E-M10 III size with the camera that it replaced: Olympus E-M10 II. Olympus E-M10 II is clearly the smaller of the two cameras. Its body is 2mm narrower, 1mm shorter and 3mm thinner than Olympus E-M10 III.
Below you can find the comparison of the weight and thickness of Olympus E-M10 III with its main competitors:
Olympus E-M10 III Size Compared to Main Competitors
Olympus E-M10 III doesn't have any environmental sealings on its body so you got to be extra careful to protect it against water and dust. If you shoot under these conditions very often, consider checking Top Mirrorless Cameras with Weather Sealing page.