Apple Watch Ultra 3 vs Samsung Galaxy Watch8 Wi-Fi 44mm
Size, specs & wrist fit compared
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Which one fits you
On wrists narrower than about 52mm, the Samsung Galaxy Watch8 Wi-Fi 44mm is the safer pick — it stays proportionate down to roughly 48mm, where the Apple Watch Ultra 3 starts to hang over the edge. Above 52mm both sit cleanly, and the Apple Watch Ultra 3 gives you more presence.
The Apple Watch Ultra 3 and Samsung Galaxy Watch8 Wi-Fi 44mm share a near-identical 44mm case, so wrist presence comes down to thickness, lug-to-lug and weight.
The Samsung Galaxy Watch8 Wi-Fi 44mm is the slimmer of the two (8.6mm vs 12mm), so it slides under a cuff more easily.
On the wrist the Samsung Galaxy Watch8 Wi-Fi 44mm feels lighter (34g vs 61.8g, case only).
The Apple Watch Ultra 3 is thinner than 89% of the 326 44mm watches we hold thickness for, the Samsung Galaxy Watch8 Wi-Fi 44mm than 99% — so both wear flatter than their widths suggest.
The Apple Watch Ultra 3 is 0.3mm wider, 3mm longer, 3.4mm thicker and 27.8g heavier than the Samsung Galaxy Watch8 Wi-Fi 44mm.
Apple
Watch Ultra 3
Samsung
Galaxy Watch8 - Wi-Fi · 44mm
Switch or add watches
Apple
Watch Ultra 3
Samsung
Galaxy Watch8 - Wi-Fi · 44mm
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.
Measure at the point where you wear your watch — typically just below the wrist bone.
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.
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.
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.
Apple Watch Ultra 3
Case 49.0mm · Lug-to-lug 49.0mm · Thickness 12.0mm · 62g
Sweet Spot
49mm on a 55mm wrist
Across the wrist it works — 3.0mm 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 49mm.
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.
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 wrist3.0mm 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~7.3mm under the rim
Wide enough that the edge of the case back lifts clear of the skin.
- Weight on the wrist62g
Substantial without being a burden — the usual weight of a steel watch on a wrist this size. (1.1g per mm of wrist)
Samsung Galaxy Watch8 - Wi-Fi · 44mm
Case 43.7mm · Lug-to-lug 46.0mm · Thickness 8.6mm · 34g
Balanced Fit
46mm on a 55mm wrist
Comfortably inside the edges of your wrist, and it seats and sits low enough to wear without thinking about it.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 46mm, so you could go bigger.
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.
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 wrist4.5mm spare each side
Comfortable, with visible skin either side.
- Off the wrist8.6mm off the skin
Sits low enough to disappear under a cuff. (8.6mm case, back against the skin)
- How it seats~4.6mm under the rim
Seats well, with the case back following most of the wrist.
- Weight on the wrist34g
Light enough to forget you have it on. (0.6g per mm of wrist)
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
- Apple Watch Ultra 344mm × 49mm · 12mm thick
- Samsung Galaxy Watch8 - Wi-Fi · 44mm43.7mm × 46mm · 8.6mm thick
3D preview
Apple Watch Ultra 3 vs Samsung Galaxy Watch8 - Wi-Fi · 44mm 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
Runtime for every power mode either watch publishes, 1 of them directly comparable.
Apple Watch Ultra 3Samsung Galaxy Watch8 Wi-Fi 44mm
Battery Saver
72 hours—Smartwatch
1.75 days2 days
Specifications
The short version
11 key specs| Spec | AppleWatch Ultra 3 | SamsungGalaxy Watch8 - Wi-Fi · 44mm |
|---|---|---|
| Case Width | 44mm | 43.7mm |
| Lug-to-Lug | 49mm | 46mm |
| Thickness | 12mm | 8.6mm |
| Weight | 61.8g | 34g |
| Shape | Rectangle | Circular |
| Water Resistance | 10 ATM | 5 ATM |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Screen size | 1.98 inches | 1.47 inches |
| Battery life | 1.75 days | 2 days |
| Released | 2025 | 2025 |
Every specification
121 specs| Spec | Apple Watch Ultra 3 | Samsung Galaxy Watch8 - Wi-Fi · 44mm |
|---|---|---|
| Design | ||
| width | 44 | 43.7 |
| height | 49 | 46 |
| volume | 25.87 cm³ | 17.29 cm³ |
| weight | 61.8 g | 34 g |
| thickness | 12 | 8.6 |
| ATM rating | 10 ATM | 5 ATM |
| resolution | 422 x 514 px | 480 x 480 px |
| screen size | 1.98 inches | 1.47 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 326 ppi | 327 ppi |
| water resistance | Waterproof | Water resistant |
| Always-On Display | Yes | Yes |
| has a touch screen | Yes | Yes |
| is designed for kids | No | No |
| waterproof depth rating | 100 m | 50 m |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | Yes | Yes |
| maximum operating temperature | 55 °C | 35 °C |
| Ingress Protection (IP) rating | IPX6 | IP68 |
| has branded damage-resistant glass | No | No |
| lowest potential operating temperature | -20 °C | 0 °C |
| width of band | — | 20 mm |
| Battery | ||
| charge time | 1.5 hours | — |
| battery life | 1.75 days | 2 days |
| has wireless charging | Yes | Yes |
| has a removable battery | No | No |
| Has a solar power battery | No | No |
| has a rechargeable battery | Yes | Yes |
| battery life in power save mode | 72 hours | — |
| battery power | — | 435 mAh |
| Sensors | ||
| has GPS | Yes | Yes |
| has a compass | Yes | Yes |
| Has a barometer | Yes | Yes |
| has a gyroscope | Yes | Yes |
| Has a cadence sensor | No | No |
| has an accelerometer | Yes | Yes |
| Monitors perspiration | No | No |
| Has a heart rate monitor | Yes | Yes |
| Has a temperature sensor | Yes | Yes |
| Monitors blood oxygenation levels | Yes | Yes |
| Features | ||
| RAM | 2GB | 2GB |
| release date | 2025-09-09 | 2025-07-09 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| warranty period | 1 years | — |
| Has call control | Yes | Yes |
| Has silent alarm | Yes | Yes |
| has HRV tracking | Yes | Yes |
| internal storage | 64GB | 32GB |
| measures VO2 max | Yes | Yes |
| Has notifications | Yes | Yes |
| Has ECG technology | Yes | Yes |
| Locates your phone | Yes | Yes |
| has a front camera | No | — |
| has fall detection | Yes | Yes |
| has voice commands | Yes | Yes |
| Acquires GPS faster | Yes | Yes |
| Has vibrating alerts | Yes | Yes |
| number of microphones | 1 | — |
| Can be used to answer calls | Yes | Yes |
| measures resting heart rate | Yes | Yes |
| has irregular heart rate warnings | Yes | Yes |
| has fast/slow heart rate notifications | Yes | Yes |
| Has a built-in camera remote control function | Yes | Yes |
| shows readiness level | — | Yes |
| Connectivity | ||
| has NFC | Yes | Yes |
| SIM cards | 1 eSIM | — |
| Wi-Fi version | Wi-Fi 4 (802.11n) | Wi-Fi 4 (802.11n) |
| supports ANT+ | No | No |
| supports Wi-Fi | Yes | Yes |
| supports Galileo | Yes | Yes |
| Bluetooth version | 5.3 | 5.3 |
| has a cellular module | Yes | No |
| Is compatible with iOS | Yes | No |
| Is compatible with Android | No | Yes |
| Miscellaneous | ||
| has aptX | No | — |
| Has passcode | Yes | Yes |
| Has auto pause | Yes | Yes |
| has crash detection | Yes | — |
| Is compatible with Windows | No | No |
| Is compatible with Mac OS X | No | No |
| has an external memory slot | No | No |
| 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 |
| App & Software | ||
| Ad-free | Yes | Yes |
| Free app | Yes | Yes |
| Has coaching | No | Yes |
| Includes maps | Yes | Yes |
| Supports routes | Yes | Yes |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has exercise diary | Yes | Yes |
| Predicts ovulation | 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 | Yes | Yes |
| Provides activity reports | Yes | Yes |
| Displays fertile window notifications | Yes | — |
| Counts how many calories you've burned | Yes | Yes |
| Tracks BMI | — | Yes |
| Activity tracking | ||
| Measures pace | Yes | Yes |
| Tracks distance | Yes | Yes |
| Tracks elevation | Yes | Yes |
| Designed for golf | No | No |
| Tracks your sleep | Yes | Yes |
| Tracks steps taken | Yes | Yes |
| Designed for diving | Yes | No |
| Has a route tracker | Yes | Yes |
| Has exercise tagging | Yes | Yes |
| Has multi-sport mode | Yes | No |
| Tracks calorie intake | No | Yes |
| Provides sleep reports | Yes | Yes |
| Detects activities automatically | Yes | Yes |
| Has a stroke counter for swimming | Yes | Yes |
Wrist Fit
Apple Watch Ultra 3
Sits best on wrists ~52–70mm wide (≈ 13.9–18.7cm circumference).
Samsung Galaxy Watch8 Wi-Fi 44mm
Sits best on wrists ~48–66mm wide (≈ 12.8–17.6cm circumference).
Frequently Asked Questions
Is the Apple Watch Ultra 3 bigger than the Samsung Galaxy Watch8 Wi-Fi 44mm?
The Apple Watch Ultra 3 is bigger — 44mm vs 43.7mm case width.
Which fits a smaller wrist better, the Apple Watch Ultra 3 or the Samsung Galaxy Watch8 Wi-Fi 44mm?
The Apple Watch Ultra 3 suits wrists around 52–70mm wide, and the Samsung Galaxy Watch8 Wi-Fi 44mm around 48–66mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Apple Watch Ultra 3 and Samsung Galaxy Watch8 Wi-Fi 44mm 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.