Garmin Fenix 8 Pro 51mm MicroLED 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 MicroLED starts to hang over the edge. Above 54mm both sit cleanly, and the Garmin Fenix 8 Pro 51mm MicroLED gives you more presence.
The Garmin Fenix 8 Pro 51mm MicroLED 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 17.5mm), so it slides under a cuff more easily.
On the wrist the Xiaomi Watch S4 feels lighter (44.5g vs 93g, case only).
Among the 54 51mm watches we hold thickness for, the Garmin Fenix 8 Pro 51mm MicroLED is thicker than 81% — 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 MicroLED is 3.7mm wider, 3.7mm longer, 5.5mm thicker and 48.5g heavier than the Xiaomi Watch S4. Both are circular.
Garmin
Fenix 8 Pro 51mm MicroLED
Xiaomi
Watch S4
Case width
51mm
47.3mm−3.7mm
Lug-to-lug
51mm
47.3mm−3.7mm
Thickness
17.5mm
12mm−5.5mm
Weight
93g
44.5g−48.5g
Switch or add watches
Garmin
Fenix 8 Pro 51mm MicroLED
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 aroundDepth
How to Measure Wrist Width
1
Lay your arm flat on a table, palm facing up
2
Measure across the flat top of your wrist (not the circumference)
3
Measure at the point where you wear your watch — typically just below the wrist bone
⚠ Important
Wrist width ≠ circumference. We need the flat width across the top of your wrist where the watch sits, not how far around.
Garmin Fenix 8 Pro 51mm MicroLED
Case 51.0mm · Lug-to-lug 51.0mm · Thickness 17.5mm · 93g
Sweet Spot
51mm on a 55mm wrist
Understated Balanced Sweet Spot Bold Overhang ⚠
Across the wrist it works — 2.0mm spare each side — but adds close to half your wrist's own depth again — expect it to snag cuffs and doorframes.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 51mm.
How to Measure
- 1. Lay your arm flat, palm up.
- 2. Measure the flat width across the top of your wrist — not the circumference.
- 3. Measure where you wear it, just below the wrist bone.
Against one you know
Leather: Attaches at the lugs, so the case back rests on your skin. Thins and softens with wear. The default: depth about seven tenths of the width. 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 wrist17.5mm off the skin
Adds close to half your wrist's own depth again — expect it to snag cuffs and doorframes. (17.5mm 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 wrist93g
Substantial without being a burden — the usual weight of a steel watch on a wrist this size. (1.7g 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
- 1. Lay your arm flat, palm up.
- 2. Measure the flat width across the top of your wrist — not the circumference.
- 3. Measure where you wear it, just below the wrist bone.
Against one you know
Leather: Attaches at the lugs, so the case back rests on your skin. Thins and softens with wear. The default: depth about seven tenths of the width. 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 MicroLED51mm · 17.5mm thick
- Xiaomi Watch S447.3mm · 12mm thick
3D preview
Garmin Fenix 8 Pro 51mm MicroLED 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 Xiaomi Watch S4 lasts 1.5× as long as the Garmin Fenix 8 Pro 51mm MicroLED (15 days against 10 days).
Garmin Fenix 8 Pro 51mm MicroLEDXiaomi Watch S4
Smartwatch
10 days15 days
Specifications
The short version
6 key specs| Spec | GarminFenix 8 Pro 51mm MicroLED | XiaomiWatch S4 |
|---|---|---|
| Case Width | 51mm | 47.3mm |
| Thickness | 17.5mm | 12mm |
| Weight | 93g | 44.5g |
| Shape | Circular | Circular |
| Display type | MicroLED (up to 4,500 nits) | OLED/AMOLED |
| Released | 2025 | 2024 |
Every specification
463 specs| Spec | Garmin Fenix 8 Pro 51mm MicroLED | Xiaomi Watch S4 |
|---|---|---|
| Overview | ||
| Family | Garmin | — |
| General | ||
| Weight | 93 g (case only: 68 g) | — |
| Battery life | Smartwatch: Up to 10 days (4 days always-on) Battery Saver Watch Mode: Up to 14 days GPS Only: Up to 44 hours (18 hours always-on) All Satellite Systems: Up to 37 hours (16 hours always-on) All Satellite Systems + Multi-band: Up to 34 hours (15 hours always-on)* All Satellite Systems + Multi-band + LTE Livetrack: Up to 17 hours (10 hours always-on)* All Satellite Systems + Multiband + Music: Up to 19 hours (11 hours always on)* All Satellite Systems + Multiband + Music + LTE Livetrack: Up to 13 hours (9 hours always on)* Max Battery GPS: Up to 53 hours Expedition GPS: Up to 8 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 17.5 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 – MicroLED | — |
| Case Size | 51 mm | — |
| Solar Charging | No | — |
| 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 | MicroLED (up to 4,500 nits) | — |
| 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 10 days (4 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 MicroLED
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 MicroLED bigger than the Xiaomi Watch S4?
The Garmin Fenix 8 Pro 51mm MicroLED is bigger — 51mm vs 47.3mm case width.
Which fits a smaller wrist better, the Garmin Fenix 8 Pro 51mm MicroLED or the Xiaomi Watch S4?
The Garmin Fenix 8 Pro 51mm MicroLED 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 MicroLED 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.