Garmin Fenix 8 47mm Solar vs Instinct 3 50mm Solar Tactical Edition
Size, specs & wrist fit compared
Which one fits you
Under 18 cm (7.1 in) round, the Instinct 3 50mm Solar Tactical Edition'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 Instinct 3 50mm Solar Tactical Edition at 19–21 cm.
What else differs
- Battery: 40 days for the Instinct 3 50mm Solar Tactical Edition against 21 days for the Fenix 8 47mm Solar in everyday use; 2.8 days for the Fenix 8 47mm Solar against 2.5 days for the Instinct 3 50mm Solar Tactical Edition with GPS on.
- Only the Fenix 8 47mm Solar has a sapphire lens.
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.
The Instinct 3 50mm Solar Tactical Edition is 3mm wider, 0.8mm thinner and 22g lighter than the Fenix 8 47mm Solar.
Fenix 8 47mm Solar
Instinct 3 50mm Solar Tactical Edition
Case width
47mm
50mm+3mm
Thickness
15.2mm
14.4mm−0.8mm
Weight
80g
58g−22g
Fenix 8 47mm Solar or Instinct 3 50mm Solar Tactical Edition by wrist size
| Wrist round (mm left each side) | Fenix 8 47mm Solar≈54mm lug to lug, est. | Instinct 3 50mm Solar Tactical Edition≈57.5mm lug to lug, est. |
|---|---|---|
| 14 cm / 5.5 in | Overhangs (4.4mm over) | Overhangs (6.2mm over) |
| 15 cm / 5.9 in | Overhangs (2.8mm over) | Overhangs (4.6mm over) |
| 16 cm / 6.3 in | Overhangs (1.2mm over) | Overhangs (2.9mm over) |
| 17 cm / 6.7 in | Bold (0.4mm) | Overhangs (1.3mm over) |
| 18 cm / 7.1 in | Sweet spot (2mm) | Bold (0.3mm) |
| 19 cm / 7.5 in | Sweet spot (3.6mm) | Sweet spot (1.9mm) |
| 20 cm / 7.9 in | Balanced (5.3mm) | Sweet spot (3.5mm) |
Switch or add watches
Garmin
Fenix 8 47mm Solar
Garmin
Instinct 3 50mm Solar Tactical Edition
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Battery life compared
Furthest apart in Battery saver mode, where the Instinct 3 50mm Solar Tactical Edition lasts 2.9× as long as the Fenix 8 47mm Solar (100 days against 34 days).
Fenix 8 47mm SolarInstinct 3 50mm Solar Tactical Edition
Battery saver
34 days +58 days100 daysExpedition
34 days +58 days60 daysSmartwatch
21 days +28 days40 daysMax battery GPS
132 hours +283 hours150 hoursGPS only
67 hours +92 hours60 hours +260 hoursAll systems
48 hours +59 hours40 hours +80 hoursAll systems + multi-band
37 hours +43 hours34 hours +60 hoursAll systems with music
13 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 Instinct 3 50mm Solar Tactical Edition 50mm × ≈57.5mm (est.) · 14.4mm thick
3D preview
Fenix 8 47mm Solar vs Instinct 3 50mm Solar Tactical Edition on a wrist
Specifications
The short version
7 key specs| Spec | GarminFenix 8 47mm Solar | GarminInstinct 3 50mm Solar Tactical Edition |
|---|---|---|
| Case Width | 47mm | 50mm |
| Thickness | 15.2mm | 14.4mm |
| Weight | 80g | 58g |
| Shape | Circular | Circular |
| Display type | Sunlight-visible, transflective memory-in-pixel (MIP) | Monochrome, sunlight-visible, transflective memory-in-pixel (MIP) |
| 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 40 days/Unlimited with solar* Battery Saver Watch Mode: Up to 100 days/Unlimited with solar* GPS Only: Up to 60 hours/260 hours with solar** All Satellite Systems: Up to 40 hours/80 hours with solar** All Satellite Systems + Multi-Band: Up to 34 hours/60 hours with solar*** Max Battery GPS: Up to 150 hours/Unlimited with solar** Expedition GPS: Up to 60 days/Unlimited 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 |
| Released | 2024 | 2025 |
Where the specifications differ
25 differences| Spec | Garmin Fenix 8 47mm Solar | Garmin Instinct 3 50mm Solar Tactical Edition |
|---|---|---|
| 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 40 days/Unlimited with solar* Battery Saver Watch Mode: Up to 100 days/Unlimited with solar* GPS Only: Up to 60 hours/260 hours with solar** All Satellite Systems: Up to 40 hours/80 hours with solar** All Satellite Systems + Multi-Band: Up to 34 hours/60 hours with solar*** Max Battery GPS: Up to 150 hours/Unlimited with solar** Expedition GPS: Up to 60 days/Unlimited 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 |
| Display Size | 1.3” (33.00 mm) diameter | Custom, two-window design: 1.1” x 1.1” (27 x 27 mm) |
| Case material | fiber-reinforced polymer with metal rear cover | fiber-reinforced polymer |
| Lens Material | Power Sapphire™ | Power Glass™ |
| Bezel Material | titanium | fiber-reinforced polymer/aluminum |
| Memory/History | 32 GB | 128 MB |
| Display resolution | 260 x 260 pixels | 176 x 176 pixels |
| QuickFit® watch band compatible | included (22 mm) | yes (26 mm) |
| Product Info | ||
| Main SKU | 010-02906-20 | 010-02935-50 |
| Product ID | 1389491 | 1476633 |
| Product Name | fēnix® 8 – 47 mm, Solar | Instinct 3 – 50 mm, Solar, Tactical Edition |
| Release Date | 8/27/2024 | 4/26/2025 |
| Product Variation | Sapphire, Titanium with Amp Yellow/Graphite Silicone Band | Black with Black Band |
| Cycling Features | ||
| FTP (Functional Threshold Power) | yes (with compatible accessory) | Yes |
| Golfing Features | ||
| Measures shot distance (calculates exact yardage for shots from anywhere on course) | automatic | manual |
| What You'll Love | ||
| Display type | Sunlight-visible, transflective memory-in-pixel (MIP) | Monochrome, sunlight-visible, transflective memory-in-pixel (MIP) |
| Battery life (smartwatch mode) | Up to 21 days (28 days with solar) | Up to 40 days/unlimited with solar |
| Activity Profiles | ||
| Gym | Strength, HIIT, Cardio, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Jump Roping | Strength, HIIT, Cardio, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing |
| Multisport | Swimming/Running, Triathlon | Triathlon |
| On the Water | Stand Up Paddleboarding, Rowing, Kayaking, Surfing, Kiteboarding, Windsurfing, Fishing, Boating, Sailing, Water Skiing, Wakeboarding, Wakesurfing, Tubing, Snorkeling, Whitewater | Stand Up Paddleboarding, Rowing, Kayaking, Surfing, Kiteboarding, Windsurfing, Fishing, Boating, Water Skiing, Snorkeling, Wakeboarding, Wakesurfing, Tubing, Whitewater |
| Outdoor running | Running, Outdoor Track Running, Trail Running, Ultra Running, Obstacle Racing | Running, Outdoor Track Running, Trail Running, Obstacle Racing |
| Other activity profiles | Inline Skating | Jumpmaster, Tactical, Inline Skating |
| Swimming Features | ||
| Heart rate from external HRM (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim) | yes (with HRM-Tri, HRM-Swim, HRM-Pro or HRM-Pro Plus) | Yes |
| Outdoor Recreation | ||
| Area calculation | yes (via Connect IQ™) | Yes |
| Daily Smart Features | ||
| Connectivity | Bluetooth®, ANT+®, Wi-Fi® | Bluetooth®, ANT+® |
The other 218 specifications both list are identical.
Full Garmin Fenix 8 47mm Solar specifications →Full Garmin Instinct 3 50mm Solar Tactical Edition specifications →