Oppo Watch X3 vs Samsung Galaxy Watch Ultra
Size, specs & wrist fit compared
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Which one fits you
Both need much the same wrist — roughly 50–68mm across the flat of the wrist. Neither will fit where the other won't, so decide on thickness, weight and features instead.
The Oppo Watch X3 and Samsung Galaxy Watch Ultra share a near-identical 47.4mm case, so wrist presence comes down to thickness, lug-to-lug and weight.
The Oppo Watch X3 is the slimmer of the two (11mm vs 12.1mm), so it slides under a cuff more easily.
On the wrist the Oppo Watch X3 feels lighter (43g vs 60.5g, case only).
The Oppo Watch X3 is thinner than 98% of the 85 47mm watches we hold thickness for, the Samsung Galaxy Watch Ultra than 87% — so both wear flatter than their widths suggest.
The Oppo Watch X3 is 1.1mm thinner and 17.5g lighter than the Samsung Galaxy Watch Ultra. Both are circular.
Oppo
Watch X3
Samsung
Galaxy Watch Ultra
Switch or add watches
Oppo
Watch X3
Samsung
Galaxy Watch Ultra
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.
Oppo Watch X3
Case 47.4mm · Lug-to-lug 47.4mm · Thickness 11.0mm · 43g
Sweet Spot
47.4mm on a 55mm wrist
Across the wrist it works — 3.8mm 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 47.4mm.
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 wrist3.8mm spare each side
Fills the wrist without reaching the edge.
- Off the wrist11.0mm off the skin
Normal sports-watch height for a wrist this size. (11.0mm 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 wrist43g
Light enough to forget you have it on. (0.8g per mm of wrist)
Samsung Galaxy Watch Ultra
Case 47.4mm · Lug-to-lug 47.4mm · Thickness 12.1mm · 61g
Sweet Spot
47.4mm on a 55mm wrist
Across the wrist it works — 3.8mm 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 47.4mm.
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 wrist3.8mm spare each side
Fills the wrist without reaching the edge.
- Off the wrist12.1mm off the skin
Normal sports-watch height for a wrist this size. (12.1mm 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 wrist61g
Substantial without being a burden — the usual weight of a steel watch on a wrist this size. (1.1g per mm of wrist)
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
- Oppo Watch X347.4mm · 11mm thick
- Samsung Galaxy Watch Ultra47.4mm · 12.1mm thick
3D preview
Oppo Watch X3 vs Samsung Galaxy Watch Ultra 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 Battery Saver mode, where the Oppo Watch X3 lasts 3.8× as long as the Samsung Galaxy Watch Ultra (16 days against 4.2 days).
Oppo Watch X3Samsung Galaxy Watch Ultra
Battery Saver
384 hours100 hoursSmartwatch
5 days4 daysTraining
—48 hours
Specifications
The short version
10 key specs| Spec | OppoWatch X3 | SamsungGalaxy Watch Ultra |
|---|---|---|
| Case Width | 47.4mm | 47.4mm |
| Thickness | 11mm | 12.1mm |
| Weight | 43g | 60.5g |
| Shape | Circular | Circular |
| Water Resistance | 5 ATM | 10 ATM |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Screen size | 1.5 inches | 1.5 inches |
| Battery life | 5 days | 4 days |
| Released | 2026 | 2024 |
Every specification
120 specs| Spec | Oppo Watch X3 | Samsung Galaxy Watch Ultra |
|---|---|---|
| Design | ||
| width | 47.4 | 47.4 |
| height | 47.4 | 47.4 |
| volume | 24.71 cm³ | 27.19 cm³ |
| weight | 43 g | 60.5 g |
| thickness | 11 | 12.1 |
| ATM rating | 5 ATM | 10 ATM |
| resolution | 466 x 466 px | 480 x 480 px |
| screen size | 1.5 inches | 1.5 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 310 ppi | 327 ppi |
| water resistance | Waterproof | Waterproof |
| Always-On Display | Yes | Yes |
| has a touch screen | Yes | Yes |
| is designed for kids | No | No |
| waterproof depth rating | 50 m | 100 m |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | Yes | Yes |
| maximum operating temperature | 70 °C | 55 °C |
| Ingress Protection (IP) rating | IP69 | IP68 |
| has branded damage-resistant glass | No | No |
| lowest potential operating temperature | -40 °C | -20 °C |
| maximum altitude | — | 29527 feet |
| Battery | ||
| charge time | 1.3 hours | — |
| battery life | 5 days | 4 days |
| battery power | 646 mAh | 590 mAh |
| has wireless charging | No | 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 | 384 hours | 100 hours |
| battery life in training mode | — | 48 hours |
| 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 | 2026-03-17 | 2024-07-10 |
| 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 | No | Yes |
| internal storage | 32GB | 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 | No |
| has fall detection | No | Yes |
| has voice commands | Yes | Yes |
| Acquires GPS faster | Yes | Yes |
| Has vibrating alerts | Yes | Yes |
| shows readiness level | No | Yes |
| Can be used to answer calls | Yes | Yes |
| measures resting heart rate | Yes | Yes |
| has irregular heart rate warnings | No | Yes |
| has fast/slow heart rate notifications | Yes | Yes |
| Has a built-in camera remote control function | — | Yes |
| Connectivity | ||
| has NFC | Yes | Yes |
| Wi-Fi version | Wi-Fi 4 (802.11n) | Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac) |
| supports ANT+ | No | No |
| supports Wi-Fi | Yes | Yes |
| supports Galileo | Yes | Yes |
| Bluetooth version | 5.2 | 5.4 |
| has a cellular module | No | Yes |
| Is compatible with iOS | Yes | No |
| Is compatible with Android | Yes | Yes |
| SIM cards | — | 1 eSIM |
| Miscellaneous | ||
| Has passcode | Yes | Yes |
| Is compatible with Windows | No | No |
| Is compatible with Mac OS X | No | No |
| has an external memory slot | No | No |
| has a battery level indicator | Yes | Yes |
| has a socket for a 3.5 mm audio jack | No | No |
| Has auto pause | — | Yes |
| Compatible with smart scales | — | Yes |
| Compatible with external heart rate monitors | — | Yes |
| App & Software | ||
| Ad-free | Yes | Yes |
| Free app | Yes | Yes |
| Has coaching | No | Yes |
| Supports routes | No | Yes |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has exercise diary | Yes | Yes |
| Can be personalised | Yes | Yes |
| Has weight tracking | Yes | Yes |
| Tracks water intake | Yes | Yes |
| Has inactivity alerts | Yes | Yes |
| Has temperature tracking | Yes | Yes |
| Doesn’t require account | No | — |
| Provides activity reports | Yes | Yes |
| Counts how many calories you've burned | Yes | Yes |
| Tracks BMI | — | Yes |
| Includes maps | — | Yes |
| Predicts ovulation | — | Yes |
| Predicts start date | — | Yes |
| Has period notifications | — | Yes |
| Displays fertile window notifications | — | Yes |
| Activity tracking | ||
| Measures pace | Yes | Yes |
| Tracks distance | Yes | Yes |
| Tracks elevation | Yes | Yes |
| Designed for golf | No | — |
| 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 | — | Yes |
Wrist Fit
Oppo Watch X3
Sits best on wrists ~50–68mm wide (≈ 13.4–18.2cm circumference).
Samsung Galaxy Watch Ultra
Sits best on wrists ~50–68mm wide (≈ 13.4–18.2cm circumference).
Frequently Asked Questions
Is the Oppo Watch X3 bigger than the Samsung Galaxy Watch Ultra?
Both have a 47.4mm case. Compare their thickness and lug-to-lug above to judge wrist presence.
Which fits a smaller wrist better, the Oppo Watch X3 or the Samsung Galaxy Watch Ultra?
The Oppo Watch X3 suits wrists around 50–68mm wide, and the Samsung Galaxy Watch Ultra around 50–68mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Oppo Watch X3 and Samsung Galaxy Watch Ultra 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.