Amazfit GTR Mini vs Garmin Instinct 3 Solar Tactical Edition 45mm
Size, specs & wrist fit compared
As an Amazon Associate, WatchFitTool earns from qualifying purchases.
Which one fits you
On wrists narrower than about 47mm, the Amazfit GTR Mini is the safer pick — it stays proportionate down to roughly 45mm, where the Garmin Instinct 3 Solar Tactical Edition 45mm starts to hang over the edge. Above 47mm both sit cleanly, and the Garmin Instinct 3 Solar Tactical Edition 45mm gives you more presence.
The Garmin Instinct 3 Solar Tactical Edition 45mm wears larger than the Amazfit GTR Mini (45mm vs 42.8mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Amazfit GTR Mini is the slimmer of the two (9.25mm vs 14.9mm), so it slides under a cuff more easily.
On the wrist the Amazfit GTR Mini feels lighter (36.2g vs 52g, case only).
Among the 315 43mm watches we hold thickness for, the Amazfit GTR Mini is thinner than 99%, so it wears flatter than its width suggests.
Among the 386 45mm watches we hold thickness for, the Garmin Instinct 3 Solar Tactical Edition 45mm is thicker than 83% — it will sit high even though the case width reads modest.
The Garmin Instinct 3 Solar Tactical Edition 45mm is 2.2mm wider, 2.2mm longer, 5.7mm thicker and 15.8g heavier than the Amazfit GTR Mini. Both are circular.
Amazfit
GTR Mini
Garmin
Instinct 3 Solar Tactical Edition 45mm
Switch or add watches
Amazfit
GTR Mini
Garmin
Instinct 3 Solar Tactical Edition 45mm
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
- Amazfit GTR Mini42.8mm · 9.3mm thick
- Garmin Instinct 3 Solar Tactical Edition 45mm45mm · 14.9mm thick
3D preview
Amazfit GTR Mini vs Garmin Instinct 3 Solar Tactical Edition 45mm on a wrist
Sized to your own wrist, turned any way you like.
Shapes are built from published measurements, not manufacturer 3D models — accurate proportions, generic dial.
Battery life compared
Furthest apart in GPS mode, where the Garmin Instinct 3 Solar Tactical Edition 45mm lasts 5.2× as long as the Amazfit GTR Mini (5.4 days against 25 hours).
Amazfit GTR MiniGarmin Instinct 3 Solar Tactical Edition 45mm
Battery Saver
720 hours—Smartwatch
14 days—Training
168 hours40 hoursGPS
25 hours130 hours
Specifications
The short version
10 key specs| Spec | AmazfitGTR Mini | GarminInstinct 3 Solar Tactical Edition 45mm |
|---|---|---|
| Case Width | 42.8mm | 45mm |
| Thickness | 9.25mm | 14.9mm |
| Weight | 36.2g | 52g |
| Shape | Circular | Circular |
| Water Resistance | 5 ATM | 10 ATM |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | LCD |
| Screen size | 1.28 inches | 0.9 inches |
| Battery life | 14 days | Unlimited days |
| Released | 2023 | 2025 |
Every specification
120 specs| Spec | Amazfit GTR Mini | Garmin Instinct 3 Solar Tactical Edition 45mm |
|---|---|---|
| Design | ||
| width | 42.8 | 45 |
| height | 42.8 | 45 |
| volume | 16.94 cm³ | 30.17 cm³ |
| weight | 36.2 g | 52 g |
| thickness | 9.25 | 14.9 |
| ATM rating | 5 ATM | 10 ATM |
| resolution | 416 x 416 px | 176 x 176 px |
| screen size | 1.28 inches | 0.9 inches |
| Display type | OLED/AMOLED | LCD |
| Has a display | Yes | Yes |
| pixel density | 326 ppi | 276 ppi |
| width of band | 20 mm | 22 mm |
| water resistance | Water resistant | Waterproof |
| Always-On Display | Yes | Yes |
| has a touch screen | Yes | No |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | No | No |
| Ingress Protection (IP) rating | IP68 | — |
| has branded damage-resistant glass | No | No |
| Battery | ||
| charge time | 2 hours | — |
| battery life | 14 days | Unlimited days |
| battery power | 280 mAh | — |
| has wireless charging | Yes | No |
| has a removable battery | No | No |
| battery life with GPS on | 25 hours | 130 hours |
| Has a solar power battery | No | Yes |
| has a rechargeable battery | Yes | Yes |
| battery life in training mode | 168 hours | 40 hours |
| battery life in power save mode | 720 hours | — |
| Sensors | ||
| has GPS | Yes | Yes |
| has a compass | Yes | Yes |
| Has a barometer | No | Yes |
| has a gyroscope | Yes | Yes |
| Has a cadence sensor | No | Yes |
| has an accelerometer | Yes | Yes |
| Monitors perspiration | No | No |
| Has a heart rate monitor | Yes | Yes |
| Has a temperature sensor | No | Yes |
| Monitors blood oxygenation levels | Yes | Yes |
| Features | ||
| release date | 2023-03-16 | 2025-04-30 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| warranty period | 1 years | 1 years |
| Has call control | Yes | No |
| Has silent alarm | Yes | Yes |
| measures VO2 max | Yes | Yes |
| Has notifications | Yes | Yes |
| Has ECG technology | No | — |
| Locates your phone | Yes | Yes |
| has fall detection | No | Yes |
| has voice commands | No | No |
| Has vibrating alerts | Yes | Yes |
| shows readiness level | Yes | Yes |
| Can be used to answer calls | No | No |
| measures resting heart rate | Yes | Yes |
| has irregular heart rate warnings | No | No |
| Has a built-in camera remote control function | Yes | No |
| has HRV tracking | — | Yes |
| internal storage | — | 0.13GB |
| Acquires GPS faster | — | Yes |
| has fast/slow heart rate notifications | — | Yes |
| Connectivity | ||
| has NFC | No | Yes |
| supports ANT+ | Yes | Yes |
| supports Wi-Fi | No | No |
| supports Galileo | Yes | Yes |
| Bluetooth version | 5.2 | — |
| has a cellular module | No | No |
| Is compatible with iOS | Yes | Yes |
| Is compatible with Android | Yes | Yes |
| Miscellaneous | ||
| Has passcode | Yes | — |
| Has auto pause | Yes | Yes |
| Is compatible with Windows | No | Yes |
| Is compatible with Mac OS X | No | Yes |
| Compatible with smart scales | Yes | Yes |
| has a battery level indicator | Yes | Yes |
| has a socket for a 3.5 mm audio jack | No | No |
| Compatible with external heart rate monitors | Yes | Yes |
| Available on PC | — | Yes |
| Can upload maps | — | No |
| Has trackback mode | — | Yes |
| Has a wind speed sensor | — | No |
| has an external memory slot | — | No |
| Provides the sunrise/sunset time | — | Yes |
| Informs about the risk of thunderstorms | — | Yes |
| App & Software | ||
| Ad-free | Yes | Yes |
| Free app | Yes | Yes |
| Tracks BMI | Yes | Yes |
| Has coaching | Yes | Yes |
| Includes maps | Yes | Yes |
| Supports routes | Yes | Yes |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has live tracking | Yes | Yes |
| Has exercise diary | Yes | Yes |
| Predicts ovulation | Yes | Yes |
| Can be personalised | Yes | Yes |
| Has weight tracking | Yes | Yes |
| Predicts start date | Yes | Yes |
| Tracks water intake | Yes | Yes |
| Has inactivity alerts | Yes | Yes |
| Has period notifications | Yes | Yes |
| Has temperature tracking | No | Yes |
| Provides activity reports | Yes | Yes |
| Displays fertile window notifications | Yes | Yes |
| Counts how many calories you've burned | Yes | Yes |
| Doesn’t require account | — | No |
| Activity tracking | ||
| Measures pace | Yes | Yes |
| Tracks distance | Yes | Yes |
| Tracks elevation | No | Yes |
| Designed for golf | No | Yes |
| Tracks your sleep | Yes | Yes |
| Tracks steps taken | Yes | Yes |
| Designed for diving | No | No |
| Has a route tracker | Yes | Yes |
| Has exercise tagging | Yes | Yes |
| Has multi-sport mode | No | Yes |
| Tracks calorie intake | Yes | Yes |
| Provides sleep reports | Yes | Yes |
| Detects activities automatically | Yes | Yes |
| Has a stroke counter for swimming | No | Yes |
Wrist Fit
Amazfit GTR Mini
Sits best on wrists ~45–61mm wide (≈ 12.0–16.3cm circumference).
Garmin Instinct 3 Solar Tactical Edition 45mm
Sits best on wrists ~47–64mm wide (≈ 12.6–17.1cm circumference).
Frequently Asked Questions
Is the Amazfit GTR Mini bigger than the Garmin Instinct 3 Solar Tactical Edition 45mm?
The Garmin Instinct 3 Solar Tactical Edition 45mm is bigger — 45mm vs 42.8mm case width.
Which fits a smaller wrist better, the Amazfit GTR Mini or the Garmin Instinct 3 Solar Tactical Edition 45mm?
The Amazfit GTR Mini suits wrists around 45–61mm wide, and the Garmin Instinct 3 Solar Tactical Edition 45mm around 47–64mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Amazfit GTR Mini and Garmin Instinct 3 Solar Tactical Edition 45mm side by side at true scale?
Yes — the schematics and photos above show both watches at matched scale, and our fit tool overlays each on your wrist width.