Garmin Instinct 3 45mm AMOLED vs Vivoactive 6
Size, specs & wrist fit compared
Which one fits you
Under 16 cm (6.3 in) round, the Instinct 3 45mm AMOLED's lugs overhang and the Vivoactive 6's do not; the Vivoactive 6 fills the wrist at 16–17.5 cm, the Instinct 3 45mm AMOLED at 17–19 cm.
What else differs
- Battery: 18 days for the Instinct 3 45mm AMOLED against 11 days for the Vivoactive 6 in everyday use; 32 hours for the Instinct 3 45mm AMOLED against 21 hours for the Vivoactive 6 with GPS on.
4mm thinner, the Vivoactive 6 is the one that slides under a shirt cuff.
The Instinct 3 45mm AMOLED is 2.8mm wider and 4mm thicker than the Vivoactive 6.
Instinct 3 45mm AMOLED
Vivoactive 6
Instinct 3 45mm AMOLED or Vivoactive 6 by wrist size
| Wrist round (mm left each side) | Instinct 3 45mm AMOLED≈51.5mm lug to lug, est. | Vivoactive 6≈48.5mm lug to lug, est. |
|---|---|---|
| 14 cm / 5.5 in | Overhangs (3.2mm over) | Overhangs (1.7mm over) |
| 15 cm / 5.9 in | Overhangs (1.6mm over) | Overhangs (0.1mm over) |
| 16 cm / 6.3 in | Bold (0.1mm) | Sweet spot (1.6mm) |
| 17 cm / 6.7 in | Sweet spot (1.7mm) | Sweet spot (3.2mm) |
| 18 cm / 7.1 in | Sweet spot (3.3mm) | Balanced (4.8mm) |
| 19 cm / 7.5 in | Balanced (4.9mm) | Balanced (6.4mm) |
| 20 cm / 7.9 in | Balanced (6.5mm) | Balanced (8mm) |
Switch or add watches
Garmin
Instinct 3 45mm AMOLED
Garmin
Vivoactive 6
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Battery life compared
Instinct 3 45mm AMOLEDVivoactive 6
Battery saver
24 days21 daysSmartwatch
18 days11 daysExpedition
16 days—Max battery GPS
68 hours—GPS only
32 hours21 hoursAll systems
25 hours17 hoursAll systems + multi-band
23 hours—All systems with music
—8 hours
More comparisons
2D Dimension Schematics
- Garmin Instinct 3 45mm AMOLED 45mm × ≈51.5mm (est.) · 14.9mm thick
- Garmin Vivoactive 6 42.2mm × ≈48.5mm (est.) · 10.9mm thick
3D preview
Instinct 3 45mm AMOLED vs Vivoactive 6 on a wrist
Specifications
The short version
6 key specs| Spec | GarminInstinct 3 45mm AMOLED | GarminVivoactive 6 |
|---|---|---|
| Case Width | 45mm | 42.2mm |
| Thickness | 14.9mm | 10.9mm |
| Shape | Circular | Circular |
| Display type | AMOLED (always-on) | AMOLED (optional always-on mode) |
| Battery life | Smartwatch: Up to 18 days (7 days always-on) Battery Saver Watch Mode: Up to 24 days GPS Only: Up to 32 hours All Satellite Systems: Up to 25 hours All Satellite Systems + Multi-Band: Up to 23 hours* Max Battery GPS: Up to 68 hours Expedition GPS: Up to 16 days *Assuming typical use with SatIQ technology | Smartwatch mode: Up to 11 days (5 days display always-on) Battery Saver Smartwatch mode: Up to 21 days GPS-Only GNSS mode: Up to 21 hours All-Systems GNSS mode: Up to 17 hours All-Systems GNSS mode with music: Up to 8 hours See details |
| Released | 2025 | 2025 |
Where the specifications differ
7 differences| Spec | Garmin Instinct 3 45mm AMOLED | Garmin Vivoactive 6 |
|---|---|---|
| General | ||
| Battery life | Smartwatch: Up to 18 days (7 days always-on) Battery Saver Watch Mode: Up to 24 days GPS Only: Up to 32 hours All Satellite Systems: Up to 25 hours All Satellite Systems + Multi-Band: Up to 23 hours* Max Battery GPS: Up to 68 hours Expedition GPS: Up to 16 days *Assuming typical use with SatIQ technology | Smartwatch mode: Up to 11 days (5 days display always-on) Battery Saver Smartwatch mode: Up to 21 days GPS-Only GNSS mode: Up to 21 hours All-Systems GNSS mode: Up to 17 hours All-Systems GNSS mode with music: Up to 8 hours See details |
| Display Size | 1.2" (30 mm) diameter | 1.2" (30.4 mm) diameter |
| Memory/History | 4 GB | 8 GB |
| What You'll Love | ||
| Display type | AMOLED (always-on) | AMOLED (optional always-on mode) |
| Water rating | 10 ATM | Swim, 5 ATM |
| Pulse Ox blood oxygen | Yes | yes (spot-check, and optional all-day and in sleep) |
| Battery life (smartwatch mode) | Up to 18 days (7 days always-on) | Up to 11 days (5 days display always-on) |
The other 11 specifications both list are identical.
Full Garmin Instinct 3 45mm AMOLED specifications →Full Garmin Vivoactive 6 specifications →