OS Details

Samsung Galaxy Watch has been launched in August 2018.
Samsung Galaxy Watch have Tizen-based wearable OS 4.0

Screen Dimensions

Samsung Galaxy Watch screen size is 1.3 inch with ~ 48.1% body ratio of actual device size. Physical dimensions for Samsung Galaxy Watch device is 1.93 x 1.81 x 0.51 INCH or ( 49 x 46 x 13 MM).

Displaying of Units are in this order "Height x Width x Thickness"

Screen Pixel Density and CSS Pixel Ratio

"Pixel" is smallest unit/element of any display.

The total number of pixels that fit into an inch is referred to as "Screen Density" or "Pixel Density" and it measured as "Pixels Per Inch".
Pixel Desnsity have limits to display Pixels Per Inch depends on different screen sizes. When number of pixels per inch increases than it's screen-size limit, the Display resolution will increase but actual device width/height in pixels remain same. Actual device pixels are known as Device Independent Pixels or CSS Pixel Ratio.

Samsung Galaxy Watch resolution is 360 x 360 ^PX with ~ 278 pixel desnsity.
Samsung Galaxy Watch viewport size is 240 x 240 ^PX with ~ 185 actual pixel density, which means it have 1.5 hdpi display pixel density.

Screen Resolution and Viewport

The sum of pixels which are displaying on a device is called as "Screen Resolution". and sum of actual pixels of any device is reffered to as "Viewport".

Samsung Galaxy Watch have 1.3" physical screen size and its resolution is about 360 x 360 Pixels with approximately 278 PPI pixel density. Samsung Galaxy Watch has viewport size 240 x 240 Pixels and its pixel ratio is about 1.5.

For better understanding screen actual sizes, viewport sizes, display resolution and about their density click here.

CSS Media Queries

Samsung Galaxy Watch Media Queries

@media only screen and (min-width: 240px) and (max-width: 319px) { /* Your Styles... */ }

Samsung Galaxy Watch Min-Width Media Queries

@media only screen and (min-width: 240px) { /* Your Styles... */ }

Samsung Galaxy Watch Min-Height Media Queries

@media only screen and (min-height: 240px) { /* Your Styles... */ }

Samsung Galaxy Watch Min-Width Media Queries

@media only screen and (max-width: 240px) { /* Your Styles... */ }

General Media Queries for Smart Watches

@media only screen and (max-width: 319px) { /* Your Styles... */ }

In current era smart watches have no viewport size greater than 319px. So 319px is choose as max-width, also it will not disturb your styles for any kind of mobiles.

Retina 2x Media Query for Smart Watches

@media
  only screen and (-webkit-min-device-pixel-ratio: 2),
  only screen and (   min--moz-device-pixel-ratio: 2),
  only screen and (     -o-min-device-pixel-ratio: 2/1),
  only screen and (        min-device-pixel-ratio: 2),
  only screen and (                min-resolution: 192dpi),
  only screen and (                min-resolution: 2dppx) { 
    /* Retina styles here */
}
                                

Samsung Galaxy Watch Specifications

• Launch Date August 2018
• Tizen-based wearable OS 4.0
• Physical Screen Size 1.3 INCH
• Resolution 360 x 360 PX
• Viewport Size 240 x 240 PX
• Pixel Density 278 PPI
• Device-Independent Pixels 185 PPI
• Pixel Ratio 1.5 hdpi
• Width 360 PX
• Height 360 PX
• Device Width 240 PX
• Device Height 240 PX
• Dimensions 49 x 46 x 13 mm (1.93 x 1.81 x 0.51 in)
• Weight 63 g - 2.22 oz