Garmin
Device summary
Garmin
fēnix 8 51mm Solar
Full specifications
| Basic information | ||
|---|---|---|
| Release year | 2023 | 2024 |
| Starting price | — | — |
| Display size | 1.4-inch | 1.4-inch |
| Dimensions | 51.0 mm × 51.0 mm × 15.4 mm | 51.0 mm × 51.0 mm × 15.7 mm |
| Weight | 67 g | 67 g |
| Front material | — | — |
| Back material | — | — |
| Display | ||
| Display technology | AMOLED | MIP |
| Resolution | 454 × 454 | 280 × 280 |
| Battery & charging | ||
| Charging standard | Garmin proprietary clip / USB charging | Garmin proprietary clip / USB charging |
| Battery type | Lithium-ion | Lithium-ion |
| Connectivity | ||
| Cellular | GPS / multi-GNSS | GPS / multi-GNSS |
| Bluetooth | Bluetooth | Bluetooth |
| NFC | Yes | Yes |
| Build & durability | ||
| Frame | Fiber-reinforced polymer; titanium bezel | Fiber-reinforced polymer; titanium bezel |
| Ingress protection | Dive 200 m / 20 ATM | 10 ATM |
| Basic information | ||
|---|---|---|
| Release year | 2023 | 2024 |
| Starting price | — | — |
| Display size | 1.4-inch | 1.4-inch |
| Dimensions | 51.0 mm × 51.0 mm × 15.4 mm | 51.0 mm × 51.0 mm × 15.7 mm |
| Weight | 67 g | 67 g |
| Front material | — | — |
| Back material | — | — |
| Display | ||
| Display technology | AMOLED | MIP |
| Resolution | 454 × 454 | 280 × 280 |
| Battery & charging | ||
| Charging standard | Garmin proprietary clip / USB charging | Garmin proprietary clip / USB charging |
| Battery type | Lithium-ion | Lithium-ion |
| Connectivity | ||
| Cellular | GPS / multi-GNSS | GPS / multi-GNSS |
| Bluetooth | Bluetooth | Bluetooth |
| NFC | Yes | Yes |
| Build & durability | ||
| Frame | Fiber-reinforced polymer; titanium bezel | Fiber-reinforced polymer; titanium bezel |
| Ingress protection | Dive 200 m / 20 ATM | 10 ATM |
Key differences
The most meaningful measured gaps in size and weight — not an overall winner.
Thickness
Descent Mk3i 51mm
0.3 mm thinner · minor difference
Height
Very similar height
Width
Very similar width
Weight
Very similar weight
What these size differences mean
Calculated from the dimensions shown, rounded to 0.1 mm and 1 g. Percentages use the smaller measurement as the reference. Fold and rotation settings affect the dimensions compared.
- Both have the same listed width (51 mm) at the displayed precision. Check this difference against the width of your current device and pocket opening.
- Both have the same listed height (51 mm) at the displayed precision. This describes the body outline; screen diagonal alone does not tell you the overall size.
- fēnix 8 51mm Solar is 0.3 mm (1.9% relative to Descent Mk3i 51mm) thicker. Cases and camera protrusions can change the clearance you need.
- Both have the same listed weight (67 g).
Use these figures to compare physical size. They do not establish one-handed reach, pocket fit, durability or an overall winner.
Sources and measurement notes
Sizometry compares published specifications and calculates differences. These are not hands-on measurements or tests of comfort, performance or pocket fit.
Descent Mk3i 51mm
fēnix 8 51mm Solar
Check the exact model, year, region and configuration on the linked page. References may cover several variants. Folded and unfolded dimensions differ; cases and camera protrusions may change the space a device needs. Drawings share a relative scale and are not calibrated to life size on your screen.