Garmin Fenix 8 47mm Solar vs Fenix 8 51mm AMOLED
Size, specs & wrist fit compared
Which one fits you
Under 18 cm (7.1 in) round, the Fenix 8 51mm AMOLED's lugs overhang and the Fenix 8 47mm Solar's do not; the Fenix 8 47mm Solar fills the wrist at 17.5–19.5 cm, the Fenix 8 51mm AMOLED at 19 cm and up.
What else differs
- Screen: the Fenix 8 51mm AMOLED has the larger screen, 1.4 in across against 1.3 in on the Fenix 8 47mm Solar, and the Fenix 8 47mm Solar uses a memory-in-pixel screen that is easy to read in sunlight and sips battery, the Fenix 8 51mm AMOLED a bright AMOLED screen.
- Battery: 29 days for the Fenix 8 51mm AMOLED against 21 days for the Fenix 8 47mm Solar in everyday use; 3.5 days for the Fenix 8 51mm AMOLED against 2.8 days for the Fenix 8 47mm Solar with GPS on.
Among the 79 smartwatches 47mm across that we hold thickness for, the Fenix 8 47mm Solar is thicker than 87%, so it sits higher on the wrist than most of its size.
Among the 52 smartwatches 51mm across that we hold thickness for, the Fenix 8 51mm AMOLED is thinner than 98%, so it wears flatter than its width suggests.
The Fenix 8 51mm AMOLED is 4mm wider, 0.5mm thinner and 22g heavier than the Fenix 8 47mm Solar.
Fenix 8 47mm Solar
Fenix 8 51mm AMOLED
Fenix 8 47mm Solar or Fenix 8 51mm AMOLED by wrist size
| Wrist round (mm left each side) | Fenix 8 47mm Solar≈54mm lug to lug, est. | Fenix 8 51mm AMOLED≈58.5mm lug to lug, est. |
|---|---|---|
| 14 cm / 5.5 in | Overhangs (4.4mm over) | Overhangs (6.7mm over) |
| 15 cm / 5.9 in | Overhangs (2.8mm over) | Overhangs (5.1mm over) |
| 16 cm / 6.3 in | Overhangs (1.2mm over) | Overhangs (3.4mm over) |
| 17 cm / 6.7 in | Bold (0.4mm) | Overhangs (1.8mm over) |
| 18 cm / 7.1 in | Sweet spot (2mm) | Overhangs (0.2mm over) |
| 19 cm / 7.5 in | Sweet spot (3.6mm) | Bold (1.4mm) |
| 20 cm / 7.9 in | Balanced (5.3mm) | Sweet spot (3mm) |
Switch or add watches
Garmin
Fenix 8 47mm Solar
Garmin
Fenix 8 51mm AMOLED
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Battery life compared
Furthest apart in All systems + multi-band mode, where the 51mm AMOLED lasts 1.7× as long as the 47mm Solar (2.6 days against 37 hours).
47mm Solar51mm AMOLED
Battery saver
34 days +58 days41 daysExpedition
34 days +58 days31 daysSmartwatch
21 days +28 days29 daysMax battery GPS
132 hours +283 hours145 hoursGPS only
67 hours +92 hours84 hoursAll systems
48 hours +59 hours68 hoursAll systems + multi-band
37 hours +43 hours62 hoursAll systems with music
13 hours18 hours
Amber figures are the solar-assisted runtime the manufacturer publishes for that mode.
More comparisons
2D Dimension Schematics
- Garmin Fenix 8 47mm Solar 47mm × ≈54mm (est.) · 15.2mm thick
- Garmin Fenix 8 51mm AMOLED 51mm × ≈58.5mm (est.) · 14.7mm thick
3D preview
Fenix 8 47mm Solar vs Fenix 8 51mm AMOLED on a wrist
Specifications
The short version
7 key specs| Spec | GarminFenix 8 47mm Solar | GarminFenix 8 51mm AMOLED |
|---|---|---|
| Case Width | 47mm | 51mm |
| Thickness | 15.2mm | 14.7mm |
| Weight | 80g | 102g |
| Shape | Circular | Circular |
| Display type | Sunlight-visible, transflective memory-in-pixel (MIP) | AMOLED |
| Battery life | Smartwatch: Up to 21 days/28 days with solar* Battery Saver Watch Mode: Up to 34 days/58 days with solar* GPS Only: Up to 67 hours/92 hours with solar** All Satellite Systems: Up to 48 hours/59 hours with solar** All Satellite Systems + Multi-band: Up to 37 hours/43 hours with solar*** All Satellite Systems + Music: Up to 13 hours Max Battery GPS: Up to 132 hours/283 hours with solar** Expedition GPS: Up to 34 days/58 days with solar* *Solar charging, assuming all-day wear with 3 hours per day outside in 50,000 lux conditions **Solar charging, assuming use in 50,000 lux conditions ***Solar charging, assuming use in 50,000 lux conditions; assuming typical use with SatIQ technology | Smartwatch: Up to 29 days (13 days always-on) Battery Saver Watch Mode: Up to 41 days GPS Only: Up to 84 hours (65 hours always-on) All Satellite Systems: Up to 68 hours (54 hours always-on) All Satellite Systems + Multi-band: Up to 62 hours (49 hours always-on)* All Satellite Systems + Music: Up to 18 hours Max Battery GPS: Up to 145 hours Expedition GPS: Up to 31 days *Assuming typical use with SatIQ technology |
| Released | 2024 | 2024 |
Where the specifications differ
13 differences| Spec | Garmin Fenix 8 47mm Solar | Garmin Fenix 8 51mm AMOLED |
|---|---|---|
| General | ||
| Battery life | Smartwatch: Up to 21 days/28 days with solar* Battery Saver Watch Mode: Up to 34 days/58 days with solar* GPS Only: Up to 67 hours/92 hours with solar** All Satellite Systems: Up to 48 hours/59 hours with solar** All Satellite Systems + Multi-band: Up to 37 hours/43 hours with solar*** All Satellite Systems + Music: Up to 13 hours Max Battery GPS: Up to 132 hours/283 hours with solar** Expedition GPS: Up to 34 days/58 days with solar* *Solar charging, assuming all-day wear with 3 hours per day outside in 50,000 lux conditions **Solar charging, assuming use in 50,000 lux conditions ***Solar charging, assuming use in 50,000 lux conditions; assuming typical use with SatIQ technology | Smartwatch: Up to 29 days (13 days always-on) Battery Saver Watch Mode: Up to 41 days GPS Only: Up to 84 hours (65 hours always-on) All Satellite Systems: Up to 68 hours (54 hours always-on) All Satellite Systems + Multi-band: Up to 62 hours (49 hours always-on)* All Satellite Systems + Music: Up to 18 hours Max Battery GPS: Up to 145 hours Expedition GPS: Up to 31 days *Assuming typical use with SatIQ technology |
| Display Size | 1.3” (33.00 mm) diameter | 1.4” (35.56 mm) diameter |
| Lens Material | Power Sapphire™ | Corning® Gorilla® Glass or sapphire crystal |
| Bezel Material | titanium | stainless steel or titanium |
| Display resolution | 260 x 260 pixels | 454 x 454 pixels |
| QuickFit® watch band compatible | included (22 mm) | included (26 mm) |
| Product Info | ||
| Main SKU | 010-02906-20 | 010-02905-10 |
| Product ID | 1389491 | 1228171 |
| Product Name | fēnix® 8 – 47 mm, Solar | fēnix® 8 – 51 mm, AMOLED |
| Product Variation | Sapphire, Titanium with Amp Yellow/Graphite Silicone Band | Sapphire, Titanium with Spark Orange/Graphite Silicone Band |
| What You'll Love | ||
| Display type | Sunlight-visible, transflective memory-in-pixel (MIP) | AMOLED |
| Battery life (smartwatch mode) | Up to 21 days (28 days with solar) | Up to 29 days (13 days always-on) |
| Outdoor Recreation | ||
| Preloaded road and trail maps | Yes | yes (Sapphire Editions only) |
The other 319 specifications both list are identical.
Full Garmin Fenix 8 47mm Solar specifications →Full Garmin Fenix 8 51mm AMOLED specifications →