Garmin Fenix 8 43mm AMOLED vs Instinct 3 50mm AMOLED Tactical Edition
Size, specs & wrist fit compared
Which one fits you
Under 18 cm (7.1 in) round, the Instinct 3 50mm AMOLED Tactical Edition's lugs overhang and the Fenix 8 43mm AMOLED's do not; the Fenix 8 43mm AMOLED fills the wrist at 16–18 cm, the Instinct 3 50mm AMOLED Tactical Edition at 19–21 cm.
What else differs
- Battery: 24 days for the Instinct 3 50mm AMOLED Tactical Edition against 10 days for the Fenix 8 43mm AMOLED in everyday use; 40 hours for the Instinct 3 50mm AMOLED Tactical Edition against 28 hours for the Fenix 8 43mm AMOLED with GPS on.
Among the 49 smartwatches 43mm across that we hold thickness for, the Fenix 8 43mm AMOLED is thicker than 90%, so it sits higher on the wrist than most of its size.
The Instinct 3 50mm AMOLED Tactical Edition is 7mm wider, 0.6mm thicker and 7g lighter than the Fenix 8 43mm AMOLED.
Fenix 8 43mm AMOLED
Instinct 3 50mm AMOLED Tactical Edition
Case width
43mm
50mm+7mm
Thickness
13.8mm
14.4mm+0.6mm
Weight
66g
59g−7g
Fenix 8 43mm AMOLED or Instinct 3 50mm AMOLED Tactical Edition by wrist size
| Wrist round (mm left each side) | Fenix 8 43mm AMOLED≈49.5mm lug to lug, est. | Instinct 3 50mm AMOLED Tactical Edition≈57.5mm lug to lug, est. |
|---|---|---|
| 14 cm / 5.5 in | Overhangs (2.2mm over) | Overhangs (6.2mm over) |
| 15 cm / 5.9 in | Overhangs (0.6mm over) | Overhangs (4.6mm over) |
| 16 cm / 6.3 in | Bold (1.1mm) | Overhangs (2.9mm over) |
| 17 cm / 6.7 in | Sweet spot (2.7mm) | Overhangs (1.3mm over) |
| 18 cm / 7.1 in | Sweet spot (4.3mm) | Bold (0.3mm) |
| 19 cm / 7.5 in | Balanced (5.9mm) | Sweet spot (1.9mm) |
| 20 cm / 7.9 in | Balanced (7.5mm) | Sweet spot (3.5mm) |
Switch or add watches
Garmin
Fenix 8 43mm AMOLED
Garmin
Instinct 3 50mm AMOLED Tactical Edition
As an Amazon Associate, WatchFitTool earns from qualifying purchases.
Battery life compared
Fenix 8 43mm AMOLEDInstinct 3 50mm AMOLED Tactical Edition
Battery saver
15 days30 daysSmartwatch
10 days24 daysExpedition
10 days20 daysMax battery GPS
49 hours86 hoursGPS only
28 hours40 hoursAll systems
23 hours32 hoursAll systems + multi-band
21 hours30 hoursAll systems with music
6 hours—
More comparisons
Garmin Fenix 8 43mm AMOLED vs Garmin Venu 4 45mmGarmin Fenix 8 43mm AMOLED vs Garmin Forerunner 570 42mmGarmin Fenix 8 43mm AMOLED vs Garmin Forerunner 970Garmin Fenix 8 43mm AMOLED vs Garmin Fenix 9 43mmGarmin Fenix 8 43mm AMOLED vs Garmin Fenix 9 Pro 43mmGarmin Fenix 8 43mm AMOLED vs Garmin Fenix 9 Pro inReach 43mm
2D Dimension Schematics
- Garmin Fenix 8 43mm AMOLED 43mm × ≈49.5mm (est.) · 13.8mm thick
- Garmin Instinct 3 50mm AMOLED Tactical Edition 50mm × ≈57.5mm (est.) · 14.4mm thick
3D preview
Fenix 8 43mm AMOLED vs Instinct 3 50mm AMOLED Tactical Edition on a wrist
Specifications
The short version
7 key specs| Spec | GarminFenix 8 43mm AMOLED | GarminInstinct 3 50mm AMOLED Tactical Edition |
|---|---|---|
| Case Width | 43mm | 50mm |
| Thickness | 13.8mm | 14.4mm |
| Weight | 66g | 59g |
| Shape | Circular | Circular |
| Display type | AMOLED | AMOLED (always-on) |
| Battery life | Smartwatch: Up to 10 days (4 days always-on) Battery Saver Watch Mode: Up to 15 days GPS Only: Up to 28 hours (22 hours always-on) All Satellite Systems: Up to 23 hours (18 hours always-on) All Satellite Systems + Multi-band: Up to 21 hours (16 hours always-on)* All Satellite Systems + Music: Up to 6 hours Max Battery GPS: Up to 49 hours Expedition GPS: Up to 10 days *Assuming typical use with SatIQ technology | Smartwatch: Up to 24 days (9 days always-on) Battery Saver Watch Mode: Up to 30 days GPS Only: Up to 40 hours All Satellite Systems: Up to 32 hours All Satellite Systems + Multi-Band: Up to 30 hours* Max Battery GPS: Up to 86 hours Expedition GPS: Up to 20 days *assuming typical use with SatIQ technology |
| Released | 2024 | 2025 |
Where the specifications differ
24 differences| Spec | Garmin Fenix 8 43mm AMOLED | Garmin Instinct 3 50mm AMOLED Tactical Edition |
|---|---|---|
| General | ||
| Battery life | Smartwatch: Up to 10 days (4 days always-on) Battery Saver Watch Mode: Up to 15 days GPS Only: Up to 28 hours (22 hours always-on) All Satellite Systems: Up to 23 hours (18 hours always-on) All Satellite Systems + Multi-band: Up to 21 hours (16 hours always-on)* All Satellite Systems + Music: Up to 6 hours Max Battery GPS: Up to 49 hours Expedition GPS: Up to 10 days *Assuming typical use with SatIQ technology | Smartwatch: Up to 24 days (9 days always-on) Battery Saver Watch Mode: Up to 30 days GPS Only: Up to 40 hours All Satellite Systems: Up to 32 hours All Satellite Systems + Multi-Band: Up to 30 hours* Max Battery GPS: Up to 86 hours Expedition GPS: Up to 20 days *assuming typical use with SatIQ technology |
| Display Size | 1.3” (33.00 mm) diameter | 1.3" (33 mm) diameter |
| Case material | fiber-reinforced polymer with metal rear cover | fiber-reinforced polymer |
| Lens Material | Corning® Gorilla® Glass or sapphire crystal | Chemically Strengthened Glass |
| Bezel Material | stainless steel or titanium | fiber-reinforced polymer/aluminum |
| Memory/History | 32 GB | 4 GB |
| QuickFit® watch band compatible | included (20 mm) | yes (26 mm) |
| Product Info | ||
| Main SKU | 010-02903-10 | 010-03020-50 |
| Product ID | 1228493 | 1718241 |
| Product Name | fēnix® 8 – 43 mm, AMOLED | Instinct® 3 – 50 mm, AMOLED, Tactical Edition |
| Release Date | 8/27/2024 | 4/26/2025 |
| Product Variation | Sapphire, Soft Gold with Fog Gray/Dark Sandstone 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 | AMOLED | AMOLED (always-on) |
| Battery life (smartwatch mode) | Up to 10 days (4 days always-on) | Up to 24 days (9 days always-on) |
| 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 224 specifications both list are identical.
Full Garmin Fenix 8 43mm AMOLED specifications →Full Garmin Instinct 3 50mm AMOLED Tactical Edition specifications →