Sony Watches Under 40mm

3 Sony models in the 0–40mm range, actually measuring 36mm to 36mm. Compact sizing that suits smaller wrists and dressier looks.

Thickness is where they separate: 8mm to 10mm. That 2mm gap decides whether a watch slides under a shirt sleeve.

1 are round and 2 rectangular — at the same nominal width, a rectangular case covers noticeably more wrist.

Under 40mm 40–44mm 44mm & Larger

Which of these fits your wrist?

Flat wrist width55.0mm

Roughly a 14.7cm wrist circumference — the measurement a tape gives you. Compared against lug-to-lug where we have it, case width otherwise.

3 of 3 models sit on this wrist without the lugs hanging over the edge.

Model	Your Fit	Width	Thickness	Shape
SmartWatch 3 - Stainless Steel · 51mm	Sweet spot2.0mm clear	36mm	10mm	rectangle
SmartWatch 3 - 51mm	Sweet spot2.0mm clear	36mm	10mm	rectangle
SmartWatch	Roomy9.5mm clear	36mm	8mm	circular

Same size, other brands

The middle of this group sits around 36mm. These are the closest matches we hold from other brands — useful when the size is right but the Sony isn't.