Garmin Fenix 8 Pro 51mm AMOLED vs Xiaomi Watch S4
Size, specs & wrist fit compared
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Which one fits you
On wrists narrower than about 54mm, the Xiaomi Watch S4 is the safer pick — it stays proportionate down to roughly 50mm, where the Garmin Fenix 8 Pro 51mm AMOLED starts to hang over the edge. Above 54mm both sit cleanly, and the Garmin Fenix 8 Pro 51mm AMOLED gives you more presence.
The Garmin Fenix 8 Pro 51mm AMOLED wears larger than the Xiaomi Watch S4 (51mm vs 47.3mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Xiaomi Watch S4 is the slimmer of the two (12mm vs 16.5mm), so it slides under a cuff more easily.
On the wrist the Xiaomi Watch S4 feels lighter (44.5g vs 90g, case only).
Among the 54 51mm watches we hold thickness for, the Garmin Fenix 8 Pro 51mm AMOLED is thicker than 74% — it will sit high even though the case width reads modest.
Among the 84 47mm watches we hold thickness for, the Xiaomi Watch S4 is thinner than 92%, so it wears flatter than its width suggests.
The Garmin Fenix 8 Pro 51mm AMOLED is 3.7mm wider, 3.7mm longer, 4.5mm thicker and 45.5g heavier than the Xiaomi Watch S4. Both are circular.
Garmin
Fenix 8 Pro 51mm AMOLED
Xiaomi
Watch S4
Case width
51mm
47.3mm−3.7mm
Lug-to-lug
51mm
47.3mm−3.7mm
Thickness
16.5mm
12mm−4.5mm
Weight
90g
44.5g−45.5g
Switch or add watches
Garmin
Fenix 8 Pro 51mm AMOLED
Xiaomi
Watch S4
Fit tool
Watch Fit Tool
For sports watches, lug-to-lug (L2L) is what matters most — it decides whether a watch overhangs your wrist. Bulky is fine; overhang is not.
Your wrist
mm
≈ 146.9mm aroundHow to Measure Your Wrist
1
Measure at the point where you wear your watch — typically just below the wrist bone.
2
Flat width — lay your arm on a table, palm facing up, and measure straight across the top of your wrist with a ruler. Bone to bone; do not follow the curve down the sides.
3
Around — wrap a tape measure snugly round the wrist. No tape? Wrap a strip of paper, mark the overlap and hold the strip against a ruler.
⚠ Important
Width ≠ circumference. They are different numbers — around 170mm is about 64mm across — so set the toggle to whichever one you actually measured before you type it in.
Garmin Fenix 8 Pro 51mm AMOLED
Case 51.0mm · Lug-to-lug 51.0mm · Thickness 16.5mm · 90g
Sweet Spot
51mm on a 55mm wrist
Understated Balanced Sweet Spot Bold Overhang ⚠
Across the wrist it works — 2.0mm spare each side — but a tall watch on this wrist. Fine over a sleeve, awkward under one.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 51mm.
How to Measure
Measure where you wear it, just below the wrist bone. Either of these works — the tool converts between them.
- 1. Flat width — arm flat on a table, palm up. Measure straight across the top of the wrist, bone to bone, ignoring the curve down the sides.
- 2. Around — a tape, or a strip of paper marked and held against a ruler, snug the whole way round.
Against one you know
Leather: Attaches at the lugs, so the case back rests on your skin. Thins and softens with wear. Typical figures, not this model’s own.
Show the measurementsHide the measurements
- Across the wrist2.0mm spare each side
Fills the wrist without reaching the edge.
- Off the wrist16.5mm off the skin
A tall watch on this wrist. Fine over a sleeve, awkward under one. (16.5mm case, back against the skin)
- How it seats~8.8mm under the rim
Wide enough that the edge of the case back lifts clear of the skin.
- Weight on the wrist90g
Substantial without being a burden — the usual weight of a steel watch on a wrist this size. (1.6g per mm of wrist)
Xiaomi Watch S4
Case 47.3mm · Lug-to-lug 47.3mm · Thickness 12.0mm · 45g
Sweet Spot
47.3mm on a 55mm wrist
Understated Balanced Sweet Spot Bold Overhang ⚠
Across the wrist it works — 3.9mm spare each side — but wide enough that the edge of the case back lifts clear of the skin.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 47.3mm.
How to Measure
Measure where you wear it, just below the wrist bone. Either of these works — the tool converts between them.
- 1. Flat width — arm flat on a table, palm up. Measure straight across the top of the wrist, bone to bone, ignoring the curve down the sides.
- 2. Around — a tape, or a strip of paper marked and held against a ruler, snug the whole way round.
Against one you know
Leather: Attaches at the lugs, so the case back rests on your skin. Thins and softens with wear. Typical figures, not this model’s own.
Show the measurementsHide the measurements
- Across the wrist3.9mm spare each side
Fills the wrist without reaching the edge.
- Off the wrist12.0mm off the skin
Normal sports-watch height for a wrist this size. (12.0mm case, back against the skin)
- How it seats~6.3mm under the rim
Wide enough that the edge of the case back lifts clear of the skin.
- Weight on the wrist45g
Light enough to forget you have it on. (0.8g per mm of wrist)
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
Highlight
- Garmin Fenix 8 Pro 51mm AMOLED51mm · 16.5mm thick
- Xiaomi Watch S447.3mm · 12mm thick
3D preview
Garmin Fenix 8 Pro 51mm AMOLED vs Xiaomi Watch S4 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 Smartwatch mode, where the Garmin Fenix 8 Pro 51mm AMOLED lasts 1.8× as long as the Xiaomi Watch S4 (27 days against 15 days).
Garmin Fenix 8 Pro 51mm AMOLEDXiaomi Watch S4
Smartwatch
27 days15 days
Specifications
The short version
6 key specs| Spec | GarminFenix 8 Pro 51mm AMOLED | XiaomiWatch S4 |
|---|---|---|
| Case Width | 51mm | 47.3mm |
| Thickness | 16.5mm | 12mm |
| Weight | 90g | 44.5g |
| Shape | Circular | Circular |
| Display type | AMOLED | OLED/AMOLED |
| Released | 2025 | 2024 |
Every specification
464 specs| Spec | Garmin Fenix 8 Pro 51mm AMOLED | Xiaomi Watch S4 |
|---|---|---|
| Overview | ||
| Family | Garmin | — |
| General | ||
| Weight | 90 g (case only: 65 g) | — |
| Battery life | Smartwatch: Up to 27 days (15 days always-on) Battery Saver Watch Mode: Up to 34 days GPS Only: Up to 78 hours (56 hours always-on) All Satellite Systems: Up to 60 hours (47 hours always-on) All Satellite Systems + Multi-band: Up to 53 hours (41 hours always-on)* All Satellite Systems + Multi-band + LTE Livetrack: Up to 21 hours (19 hours always-on)* All Satellite Systems + Multiband + Music: Up to 23 hours (21 hours always on)* All Satellite Systems + Multiband + Music + LTE Livetrack: Up to 15 hours (14 hours always on)* Max Battery GPS: Up to 123 hours Expedition GPS: Up to 24 days *Assuming typical use with SatIQ technology | — |
| Battery type | Lithium ion | — |
| Display Size | 1.4” (35.56 mm) diameter | — |
| Case material | fiber-reinforced polymer with titanium rear cover | — |
| Color display | Yes | — |
| Lens material | Sapphire crystal | — |
| Physical size | 51 x 51 x 16.5 mm Fits wrists with the following circumference: Silicone band: 127-210 mm UltraFit Band: 127-225 mm Leather Band: 135-213 mm Metal Band: 135-225 mm | — |
| Bezel material | titanium | — |
| Memory/History | 32 GB | — |
| Strap material | silicone | — |
| Charging method | Garmin proprietary plug charger | — |
| Large font option | Yes | — |
| Display resolution | 454 x 454 pixels | — |
| Built-in speaker/microphone | Yes | — |
| Leakproof inductive buttons | Yes | — |
| QuickFit® watch band compatible | included (26 mm) | — |
| Sensors | ||
| Stocks | Yes | — |
| Calendar | Yes | — |
| Passcode | Yes | — |
| Calculator | Yes | — |
| Color shift | Yes | — |
| Connectivity | LTE, Satellite, Bluetooth®, ANT+®, Wi-Fi® | — |
| Garmin Share | Yes | — |
| Find My Phone | Yes | — |
| Voice command | Yes | — |
| Evening report | Yes | — |
| Morning report | Yes | — |
| Red shift mode | Yes | — |
| Weather forecasts | Yes | — |
| Smart Notifications | Yes | — |
| Smart trainer control | Yes | — |
| Smartphone compatibility | iPhone®, Android™ | — |
| Controls smartphone music | Yes | — |
| On-device Connect IQ™ Store | Yes | — |
| Plays and controls watch music | Yes | — |
| Find My Phone during GPS activity | Yes | — |
| Pairs with Garmin Connect™ Mobile | Yes | — |
| Compatible with Garmin Messenger app | Yes | — |
| Find My Garmin (helps locate lost device) | Yes | — |
| Battery saver (customizable low power watch) | Yes | — |
| Bluetooth phone calling and voice assistant support | Yes | — |
| Realtime settings sync with Garmin Connect™ mobile | Yes | — |
| View images from notifications on watch (Android™ only) | Yes | — |
| Text response/reject phone call with text (Android™ only) | Yes | — |
| Connect IQ™ (downloadable watch faces, data fields and apps) | Yes | — |
| has GPS | — | Yes |
| has a compass | — | Yes |
| Has a barometer | — | Yes |
| has a gyroscope | — | Yes |
| Has a cadence sensor | — | No |
| has an accelerometer | — | Yes |
| Monitors perspiration | — | No |
| Has a heart rate monitor | — | Yes |
| Has a temperature sensor | — | Yes |
| Monitors blood oxygenation levels | — | Yes |
| Variant | ||
| Color | Sapphire, Carbon Gray DLC Titanium with Black/Pebble Gray Silicone Band | — |
| Version | fēnix 8 Pro – AMOLED | — |
| Case Size | 51 mm | — |
| Solar Charging | No | — |
| Available Colors | Sapphire, Carbon Gray DLC Titanium with Black/Pebble Gray Silicone Band; Sapphire, Titanium with Graphite/Black Silicone Band | — |
| Clock Features | ||
| Sleep | yes (advanced) | — |
| Hydration | yes (in Garmin Connect™ and optional Connect IQ™ widget) | — |
| Breathwork | Yes | — |
| Meditation | Yes | — |
| Fitness age | Yes | — |
| Sleep coach | Yes | — |
| Health status | Yes | — |
| Nap detection | Yes | — |
| All-day stress | Yes | — |
| Women's health | yes (in Garmin Connect™ and optional Connect IQ™ widget) | — |
| Health snapshot | Yes | — |
| Jet lag adviser | Yes | — |
| Sleep alignment | Yes | — |
| Respiration rate | Yes | — |
| Skin temperature | Yes | — |
| Lifestyle logging | Yes | — |
| Resting heart rate | Yes | — |
| Breathing variations | Yes | — |
| Past ovulation estimates | Yes | — |
| Abnormal heart rate alerts | yes (high and low) | — |
| Relaxation breathing timer | Yes | — |
| Body Battery™ energy monitor | Yes | — |
| Heart rate (constant, every second) | Yes | — |
| Diving Features | ||
| Wearable trolling motor remote | Yes | — |
| Boating Features | ||
| TrueUp™ | Yes | — |
| Move IQ™ | Yes | — |
| Step counter | Yes | — |
| Floors climbed | Yes | — |
| Calories burned | Yes | — |
| Distance traveled | Yes | — |
| Intensity minutes | Yes | — |
| Automatic rep counting | Yes | — |
| Garmin Connect™ Challenges app | yes (optional Connect IQ app) | — |
| Move alerts (displays on device after a period of inactivity) | Yes | — |
| Auto goal (learns your activity level and assigns a daily step goal) | Yes | — |
| Cycling Features | ||
| Pool swim workouts | Yes | — |
| Critical swim speed | Yes | — |
| Time and distance alerts | Yes | — |
| Auto rest (pool swim only) | Yes | — |
| Drill logging (pool swim only) | Yes | — |
| Pacing alerts (pool swim only) | Yes | — |
| Countdown start (pool swim only) | Yes | — |
| Underwater wrist-based heart rate | Yes | — |
| "Repeat on" rest timer (pool swim only) | Yes | — |
| Basic rest timer (up from 0) (pool swim only) | Yes | — |
| Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only) | Yes | — |
| Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories) | Yes | — |
| Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF), calories) | Yes | — |
| 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-Swim, HRM-Pro, HRM-Pro Plus or HRM 600) | — |
| Golfing Features | ||
| Tides | Yes | — |
| Auto rest | Yes | — |
| Sight 'N Go | Yes | — |
| Tide glance | Yes | — |
| Fish forecast | Yes | — |
| UltraTrac mode | Yes | — |
| Vertical speed | Yes | — |
| GPS coordinates | Yes | — |
| Elevation profile | Yes | — |
| Projected waypoint | Yes | — |
| Total ascent/descent | Yes | — |
| Future elevation plot | Yes | — |
| Distance to destination | Yes | — |
| Expedition GPS Activity | Yes | — |
| Sun and moon information | Yes | — |
| Rest Timer (Ultra Run only) | Yes | — |
| Barometric trend indicator with storm alert | Yes | — |
| Running Features | ||
| PinPointer | Yes | — |
| Swing Tempo | Yes | — |
| Custom targets | Yes | — |
| Tempo Training | Yes | — |
| Virtual caddie | Yes | — |
| Full vector map | Yes | — |
| Handicap scoring | Yes | — |
| Tournament legal | Yes | — |
| Digital scorecard | Yes | — |
| Garmin AutoShot™ | Yes | — |
| PlaysLike distance | Yes | — |
| Round timer/odometer | Yes | — |
| Auto CourseView updates | Yes | — |
| Yardage to layups/doglegs | Yes | — |
| Hazards and course targets | Yes | — |
| Pairs with Garmin Golf app | Yes | — |
| Green View with manual pin position | Yes | — |
| Preloaded with 43,000 courses worldwide | Yes | — |
| Green Contours (with Garmin Golf membership) | Yes | — |
| CT1 Automatic club tracking compatible (requires accessory) | Yes | — |
| CT10 Automatic club tracking compatible (requires accessory) | Yes | — |
| Yardage to F/M/B (distance to front, middle and back of green) | Yes | — |
| Stat tracking (strokes, putts per round, greens and fairways hit) | Yes | — |
| Wind speed and direction (requires connection to Garmin Golf app) | Yes | — |
| Touch-targeting (touch target on display to see the distance to any point) | Yes | — |
| Measures shot distance (calculates exact yardage for shots from anywhere on course) | automatic | — |
| What You'll Love | ||
| Timer | Yes | — |
| Stopwatch | Yes | — |
| Time/date | Yes | — |
| Alarm clock | Yes | — |
| Touchscreen | Yes | — |
| Display type | AMOLED | — |
| Water rating | 10 ATM | — |
| GPS Time Sync | Yes | — |
| Garmin Pay™ | Yes | — |
| Music storage | Yes | — |
| Garmin ECG App | Yes | — |
| LED flashlight | Yes | — |
| Multi-band GPS | Yes | — |
| Training status | Yes | — |
| Built-in mapping | Yes | — |
| Smart wake alarm | Yes | — |
| LTE communication | yes (inReach plan required, coverage details) | — |
| Training readiness | Yes | — |
| Sunrise/sunset times | Yes | — |
| Pulse Ox blood oxygen | Yes | — |
| Satellite communication | yes (inReach plan required, coverage details) | — |
| Sleep score and insights | Yes | — |
| Automatic daylight saving time | Yes | — |
| Battery life (smartwatch mode) | Up to 27 days (15 days always-on) | — |
| Make calls and send texts via voice | Yes | — |
| Activity Profiles | ||
| Assistance | Yes | — |
| Location tracking | Yes | — |
| Live Event Sharing | Yes | — |
| Incident Detection during select activities | Yes | — |
| Incident detection alert on phone for wearables | Yes | — |
| Tactical Features | ||
| PO2 | up to 1.6 with customizable Deco settings | — |
| Tides | Yes | — |
| Backlight | yes (configurable intensity; always on) | — |
| Gas mixes | Air, Nitrox (21-40% Oxygen) | — |
| APNEA mode | Yes | — |
| Deep Stops | yes (using custom Gradient Factors) | — |
| No fly time | Yes | — |
| Safety Stop | yes (customizable off/3min/5min) | — |
| Dive planner | yes (Basic NDL & Gas Planner) | — |
| Nitrox support | Yes | — |
| Single-gas mode | Yes | — |
| Alerts and alarms | yes (vibration only) | — |
| 3-axis dive compass | yes with adjustable heading, quick change to 90R, 90L, and Reciprocal. Indicates degrees and direction back to set heading. | — |
| Auto start/end dive | Yes | — |
| Decompression model | Bühlmann ZHL-16c with Gradient Factors | — |
| Missed Deco Lockout | yes (can be disabled prior to dive with user acknowledgement) | — |
| Custom end-dive timeout | yes (20 sec to 10 min) | — |
| Customizable conservatism | yes (Low/Medium/High) | — |
| Surface diver status widget | yes (Surface Interval, no fly time, N2 loading, CNS, OTU, and Tissue Compartment status) | — |
| Automatic altitude adjustment | Yes | — |
| Dive ascent/descent rate indicator | Yes | — |
| Dive activity maximum operating depth | 40 meters | — |
| Sync dive log to Garmin Dive™ Mobile app | Yes | — |
| Automatically saves dive entry and exit locations | Yes | — |
| Outdoor Recreation | ||
| Up Ahead | Yes | — |
| TracBack® | Yes | — |
| Back to start | Yes | — |
| Explore Nearby | Yes | — |
| NextFork™ navigation | Yes | — |
| Point-to-point navigation | Yes | — |
| Preloaded ski resort maps | Yes | — |
| ClimbPro™ Ascent Planner | Yes | — |
| Preloaded road and trail maps | Yes | — |
| Bread crumb trail in real time | Yes | — |
| Downloadable cartography support | Yes | — |
| Daily Smart Features | ||
| LTE weather | yes (coverage details) | — |
| LTE LiveTrack | yes (coverage details) | — |
| Text messaging | yes (coverage details) | — |
| Interactive SOS | yes (satellite & LTE; coverage details) | — |
| Location check-ins | yes (satellite & LTE; coverage details) | — |
| LTE voice messaging | yes (coverage details) | — |
| Two-way voice calls | yes (coverage details) | — |
| Satellite text messaging | yes (coverage details) | — |
| Mapping & Navigation | ||
| Courses | Yes | — |
| Power guide | Yes | — |
| MTB Grit & Flow | Yes | — |
| Race an activity | Yes | — |
| Power meter compatible | Yes | — |
| Advanced cycling dynamics | Yes | — |
| Power curve and % FTP workouts | Yes | — |
| Compatible with Varia™ lights | Yes | — |
| FTP (Functional Threshold Power) | yes (with compatible accessory) | — |
| Compatible with Varia headlight camera | Yes | — |
| Speed and cadence sensor support (w/sensor) | Yes | — |
| Cycle Map (routable cycling-specific street map) | Yes | — |
| Bike lap and lap maximum power (with power sensor) | Yes | — |
| Compatible with Varia™ radar (rear-facing radar) | Yes | — |
| Compatible with Vector™ and Rally™ (power meters) | Yes | — |
| Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories) | Yes | — |
| Activity Tracking Features | ||
| % HRR | Yes | — |
| % HR max | Yes | — |
| HR zones | Yes | — |
| HR alerts | Yes | — |
| Shortcuts | Yes | — |
| HRV status | Yes | — |
| Load ratio | Yes | — |
| Manual lap | Yes | — |
| Rest timer | Yes | — |
| Auto max HR | Yes | — |
| Auto scroll | Yes | — |
| Finish time | Yes | — |
| HR calories | Yes | — |
| Voice alerts | Yes | — |
| Custom alerts | Yes | — |
| Physio TrueUp | Yes | — |
| Recovery time | Yes | — |
| Training load | Yes | — |
| VO2 Max (Run) | Yes | — |
| Course guidance | Yes | — |
| Endurance score | Yes | — |
| Training effect | Yes | — |
| Virtual Partner | Yes | — |
| Workout benefit | Yes | — |
| Race an Activity | Yes | — |
| Realtime stamina | Yes | — |
| Advanced workouts | Yes | — |
| Interval training | Yes | — |
| Race glance/widget | Yes | — |
| Training load focus | Yes | — |
| VO2 Max (Trail Run) | Yes | — |
| Garmin Live Segments | Yes | — |
| Strava Live Segments | Yes | — |
| GPS speed and distance | Yes | — |
| Configurable lap alerts | Yes | — |
| Customizable data pages | Yes | — |
| Unified training status | Yes | — |
| Touch and/or button lock | Yes | — |
| Activity history on watch | Yes | — |
| Multisport auto transition | Yes | — |
| Downloadable training plans | Yes | — |
| Training effect (anaerobic) | Yes | — |
| Manual multisport activities | Yes | — |
| HRM running pace and distance | Yes | — |
| Heat and altitude acclimation | Yes | — |
| Customizable activity profiles | Yes | — |
| Trendline™ Popularity Routing | Yes | — |
| Auto Pause® automatic timer halt | Yes | — |
| Respiration rate (during exercise) | yes (with compatible accessory) | — |
| Auto Lap® interval tracking feature | Yes | — |
| Primary benefit (Training Effect labels) | Yes | — |
| Round-trip course creator (running/cycling) | Yes | — |
| Power Modes - customizable in-activity battery settings | Yes | — |
| HR broadcast (broadcasts HR data over ANT+® to paired devices) | Yes | — |
| Improved interval (includes open repeats, intervals data page, rest screen and auto detection) | Yes | — |
| HRV stress test (measures your heart rate variability while standing still, for 3 minutes, to provide you with an estimated stress level; the scale of this is 1 to 100; low scores indicate lower stress levels) | yes (with compatible accessory) | — |
| Workout and Training Plans | ||
| Gym | Strength, HIIT, Cardio, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Jump Roping | — |
| Dive | Scuba Diving (single gas), Apnea Diving | — |
| Swim | Pool Swimming, Open Water Swimming | — |
| Cycling | Biking, Road Biking, Mountain Biking, Gravel Biking, Bike Commuting, Bike Touring, eBiking, eMountain Biking, Indoor Biking, Cyclocross, BMX | — |
| Wellness | Walking, Pilates, Yoga, Indoor Walking, Mobility | — |
| Multisport | Swimming/Running, Triathlon | — |
| In the ring | Boxing, Mixed Martial Arts | — |
| Team sports | Basketball, Volleyball, Field Hockey, Ice Hockey, Football/Soccer, American Football, Lacrosse, Rugby, Ultimate Disc, Cricket, Softball, Baseball | — |
| Motor sports | Motorcycling, Overlanding, Motocrossing, ATVing, Snowmobiling | — |
| On the water | Stand Up Paddleboarding, Rowing, Kayaking, Surfing, Kiteboarding, Windsurfing, Fishing, Boating, Sailing, Water Skiing, Wakeboarding, Wakesurfing, Tubing, Snorkeling, Whitewater | — |
| Racket sports | Tennis, Pickleball, Badminton, Squash, Table Tennis, Padel, Platform Tennis, Racquetball | — |
| Indoor running | Treadmill Running, Indoor Track Running, Virtual Running | — |
| Outdoor running | Running, Outdoor Track Running, Trail Running, Ultra Running, Obstacle Racing | — |
| Snow and winter | Skiing, Snowboarding, Backcountry Snowboarding, XC Classic Skiing, XC Skate Skiing, Backcountry Skiing, Ice Skating, Snowshoeing | — |
| Outdoor recreation | Hiking, Rucking, Indoor Climbing, Bouldering, Mountaineering, Hunting, Horseback Riding, Golfing, Disc Golf, Archery | — |
| Other activity profiles | Inline Skating | — |
| Health & Wellness Monitoring | ||
| GPS | Yes | — |
| QZSS | Yes | — |
| BeiDou | Yes | — |
| Compass | Yes | — |
| GLONASS | Yes | — |
| Galileo | Yes | — |
| Gyroscope | Yes | — |
| Thermometer | Yes | — |
| Depth sensor | yes (to 40 m) | — |
| Accelerometer | Yes | — |
| SatIQ™ Technology | Yes | — |
| Ambient light sensor | Yes | — |
| Barometric altimeter | Yes | — |
| Pulse Ox Blood Oxygen Saturation Monitor | Yes | — |
| Garmin Elevate™ wrist heart rate monitor | Yes | — |
| Safety and Tracking Features | ||
| Dual grid coordinates | Yes | — |
| Training, Planning and Analysis Features | ||
| Hill score | Yes | — |
| Run workouts | Yes | — |
| Running power | Yes | — |
| Race predictor | Yes | — |
| Running Economy | yes (with compatible accessory) | — |
| Step speed loss | yes (with compatible accessory) | — |
| Foot pod capable | Yes | — |
| Running dynamics | Yes | — |
| Lactate threshold | Yes | — |
| Running Tolerance | Yes | — |
| Grade-adjusted pace | Yes | — |
| Trail run auto climb | Yes | — |
| Performance condition | Yes | — |
| Run/Walk/Stand detection | Yes | — |
| Stride length (real time) | Yes | — |
| PacePro™ Pacing Strategies | Yes | — |
| Projected race time and pace | Yes | — |
| Vertical oscillation and ratio | Yes | — |
| Ground contact time and balance | yes (GCT balance with accessory) | — |
| GPS-based distance, time and pace | Yes | — |
| Course- and weather-specific race predictor | Yes | — |
| Cadence (provides real-time number of steps per minute) | Yes | — |
| Communication Features (with Subscription) | ||
| HIIT workouts | Yes | — |
| Yoga workouts | Yes | — |
| Cardio workouts | Yes | — |
| Pilates workouts | Yes | — |
| Strength workouts | Yes | — |
| Multisport workouts | Yes | — |
| Garmin Cycling Coach | Yes | — |
| Garmin Running Coach | Yes | — |
| Garmin Triathlon Coach | Yes | — |
| Garmin Coach - Strength | Yes | — |
| Garmin Running Coach Experts | Yes | — |
| On-screen workout animations | Yes | — |
| On-screen workout muscle maps | Yes | — |
| Garmin Coach - Prebuilt Cycling Plans | Yes | — |
| Daily Suggested Workout - Cycling (Pace and Heart Rate Based) | Yes | — |
| Daily Suggested Workout - Running (Pace and Heart Rate Based) | Yes | — |
| Design | ||
| width | — | 47.3 |
| height | — | 47.3 |
| volume | — | 26.85 cm³ |
| weight | — | 44.5 g |
| thickness | — | 12 |
| ATM rating | — | 5 ATM |
| resolution | — | 466 x 466 px |
| screen size | — | 1.43 inches |
| Display type | — | OLED/AMOLED |
| Has a display | — | Yes |
| pixel density | — | 326 ppi |
| water resistance | — | Waterproof |
| Always-On Display | — | Yes |
| has a touch screen | — | Yes |
| is designed for kids | — | No |
| waterproof depth rating | — | 50 m |
| Watch band is replaceable | — | Yes |
| Has sapphire glass display | — | Yes |
| has branded damage-resistant glass | — | No |
| Battery | ||
| battery life | — | 15 days |
| battery power | — | 486 mAh |
| has wireless charging | — | Yes |
| has a removable battery | — | No |
| Has a solar power battery | — | No |
| has a rechargeable battery | — | Yes |
| Features | ||
| release date | — | 2024-10-29 |
| Has a stopwatch | — | Yes |
| Has smart alarm | — | No |
| warranty period | — | 1 years |
| Has call control | — | Yes |
| Has silent alarm | — | Yes |
| has HRV tracking | — | Yes |
| internal storage | — | 32GB |
| measures VO2 max | — | Yes |
| Has notifications | — | Yes |
| Has ECG technology | — | No |
| Locates your phone | — | Yes |
| has a front camera | — | No |
| has fall detection | — | Yes |
| has voice commands | — | Yes |
| Acquires GPS faster | — | Yes |
| Has vibrating alerts | — | Yes |
| number of microphones | — | 2 |
| shows readiness level | — | Yes |
| Can be used to answer calls | — | Yes |
| measures resting heart rate | — | Yes |
| has irregular heart rate warnings | — | No |
| has fast/slow heart rate notifications | — | Yes |
| Has a built-in camera remote control function | — | Yes |
| Connectivity | ||
| has NFC | — | Yes |
| SIM cards | — | 1 eSIM |
| supports ANT+ | — | No |
| supports Wi-Fi | — | No |
| supports Galileo | — | Yes |
| Bluetooth version | — | 5.3 |
| has a cellular module | — | Yes |
| Is compatible with iOS | — | Yes |
| Is compatible with Android | — | Yes |
| Miscellaneous | ||
| Has passcode | — | Yes |
| Is compatible with Windows | — | No |
| Is compatible with Mac OS X | — | No |
| has an external memory slot | — | No |
| has a battery level indicator | — | Yes |
| has a socket for a 3.5 mm audio jack | — | No |
| App & Software | ||
| Ad-free | — | Yes |
| Free app | — | Yes |
| Has coaching | — | No |
| Includes maps | — | Yes |
| Supports routes | — | No |
| Has achievements | — | Yes |
| Has goal setting | — | Yes |
| Has exercise diary | — | Yes |
| Predicts ovulation | — | Yes |
| Can be personalised | — | Yes |
| Has weight tracking | — | Yes |
| Predicts start date | — | Yes |
| Tracks water intake | — | Yes |
| Has inactivity alerts | — | Yes |
| Has period notifications | — | Yes |
| Has temperature tracking | — | Yes |
| Doesn’t require account | — | No |
| Provides activity reports | — | Yes |
| Counts how many calories you've burned | — | Yes |
| Activity tracking | ||
| Measures pace | — | Yes |
| Tracks distance | — | Yes |
| Tracks elevation | — | Yes |
| Tracks your sleep | — | Yes |
| Tracks steps taken | — | Yes |
| Designed for diving | — | No |
| Has a route tracker | — | Yes |
| Has exercise tagging | — | Yes |
| Tracks calorie intake | — | Yes |
| Provides sleep reports | — | Yes |
| Detects activities automatically | — | Yes |
| Has a stroke counter for swimming | — | Yes |
Wrist Fit
Garmin Fenix 8 Pro 51mm AMOLED
Sits best on wrists ~54–73mm wide (≈ 14.4–19.5cm circumference).
Xiaomi Watch S4
Sits best on wrists ~50–68mm wide (≈ 13.4–18.2cm circumference).
Frequently Asked Questions
Is the Garmin Fenix 8 Pro 51mm AMOLED bigger than the Xiaomi Watch S4?
The Garmin Fenix 8 Pro 51mm AMOLED is bigger — 51mm vs 47.3mm case width.
Which fits a smaller wrist better, the Garmin Fenix 8 Pro 51mm AMOLED or the Xiaomi Watch S4?
The Garmin Fenix 8 Pro 51mm AMOLED suits wrists around 54–73mm wide, and the Xiaomi Watch S4 around 50–68mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Garmin Fenix 8 Pro 51mm AMOLED and Xiaomi Watch S4 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.