SmartWatch 3 51mm Size, Dimensions & Wrist Fit
Case Width
36mm
Thickness
10mm
Lug-to-Lug
51mm
Weight
45g
The SmartWatch 3 51mm looks in proportion on wrists of 16 cm (6.3 in) and up round, and fills the wrist at 16.5–18.5 cm (51mm lug to lug).
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Does the SmartWatch 3 51mm fit your wrist?
| Wrist round (mm left each side) | 51mm |
|---|---|
| 14 cm / 5.5 in | Overhangs (2.9mm over) |
| 15 cm / 5.9 in | Overhangs (1.3mm over) |
| 16 cm / 6.3 in | Bold (0.3mm) |
| 17 cm / 6.7 in | Sweet spot (1.9mm) |
| 18 cm / 7.1 in | Sweet spot (3.5mm) |
| 19 cm / 7.5 in | Balanced (5.1mm) |
| 20 cm / 7.9 in | Balanced (6.8mm) |
The SmartWatch 3 51mm in short
- Compared with the previous SmartWatch 2, it is 5mm narrower, 1mm thicker and 77.5g lighter.
- Rated for 2 days of use per charge.
- Water resistant; no depth rating published.
- 45g on the wrist.
- 1.6 inches LCD display.
Compare with another watch
Size, fit and battery side by side, against any smartwatch we list.
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SmartWatch 3 51mm battery life
Published runtime
- Battery life2 days
Where it ranks among Sony watches
- Everyday use2 days#5 of 6
Settings to change and the 24-hour idle test are on the battery check.
2D Dimension Schematics
- Sony SmartWatch 3 51mm 36mm × 51mm · 10mm thick
3D preview
Sony SmartWatch 3 51mm on a wrist
Alternatives to the SmartWatch 3 51mm
SmartWatch 3 51mm specifications
- Battery life
- 2 days
- Display
- 1.6 inches
- Resolution
- 320 x 320 px
- Water rating
- Water resistant
- Storage
- 4GB
Show all specificationsSony's published specification, for reference · checked September 2026
Design
- width
- 36
- height
- 51
- volume
- 18.36 cm³
- weight
- 45 g
- thickness
- 10
- resolution
- 320 x 320 px
- screen size
- 1.6 inches
- Display type
- LCD
- Has a display
- Yes
- pixel density
- 176 ppi
- water resistance
- Water resistant
- has a touch screen
- Yes
Battery
- battery life
- 2 days
- battery power
- 420 mAh
- has a rechargeable battery
- Yes
Sensors
- has GPS
- Yes
- has a compass
- Yes
- has an accelerometer
- Yes
Features
- RAM
- 0.51GB
- Has a stopwatch
- Yes
- Has call control
- Yes
- Has silent alarm
- Yes
- internal storage
- 4GB
- Has notifications
- Yes
- has voice commands
- Yes
- Can be used to answer calls
- Yes
- Has a built-in camera remote control function
- Yes
Connectivity
- has NFC
- Yes
- supports Wi-Fi
- Yes
- Bluetooth version
- 4
- Is compatible with Android
- Yes
Miscellaneous
- has a battery level indicator
- Yes
Activity tracking
- Tracks steps taken
- Yes
