Oppo Watch 4 Pro vs Watch S
Size, specs & wrist fit compared
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Which one fits you
On wrists narrower than about 53mm, the Watch S is the safer pick — it stays proportionate down to roughly 47mm, where the Watch 4 Pro starts to hang over the edge. Above 53mm both sit cleanly, and the Watch 4 Pro gives you more presence.
The Watch S wears larger than the Watch 4 Pro (45mm vs 38.3mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Watch S is the slimmer of the two (8.9mm vs 12.9mm), so it slides under a cuff more easily.
On the wrist the Watch S feels lighter (35g vs 52.3g, case only).
Among the 362 38mm watches we hold thickness for, the Watch 4 Pro is thicker than 84% — it will sit high even though the case width reads modest.
Among the 385 45mm watches we hold thickness for, the Watch S is thinner than 100%, so it wears flatter than its width suggests.
The Watch S is 6.7mm wider, 5.1mm shorter, 4mm thinner and 17.3g lighter than the Watch 4 Pro.
Watch 4 Pro
Watch S
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Oppo
Watch 4 Pro
Oppo
Watch S
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 4 Pro
Case 50.1mm · Lug-to-lug 50.1mm · Thickness 12.9mm · 52g
Sweet Spot
50.1mm on a 55mm wrist
Across the wrist it works — 2.4mm 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 50.1mm.
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 wrist2.4mm spare each side
Fills the wrist without reaching the edge.
- Off the wrist12.9mm off the skin
Normal sports-watch height for a wrist this size. (12.9mm case, back against the skin)
- How it seats~8.1mm under the rim
Wide enough that the edge of the case back lifts clear of the skin.
- Weight on the wrist52g
Light enough to forget you have it on. (1.0g per mm of wrist)
Oppo Watch S
Case 45.0mm · Lug-to-lug 45.0mm · Thickness 8.9mm · 35g
Balanced Fit
45mm 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 45mm, 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 wrist5.0mm spare each side
Comfortable, with visible skin either side.
- Off the wrist8.9mm off the skin
Sits low enough to disappear under a cuff. (8.9mm case, back against the skin)
- How it seats~5.2mm under the rim
Seats well, with the case back following most of the wrist.
- Weight on the wrist35g
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.
- Oppo Watch 4 Pro38.3mm × 50.1mm · 12.9mm thick
- Oppo Watch S45mm · 8.9mm thick
3D preview
Watch 4 Pro vs Watch S 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 S lasts 1.4× as long as the 4 Pro (7 days against 5 days).
4 ProS
Smartwatch
5 days7 daysTraining
60 hours—
Specifications
The short version
11 key specs| Spec | OppoWatch 4 Pro | OppoWatch S |
|---|---|---|
| Case Width | 38.3mm | 45mm |
| Lug-to-Lug | 50.1mm | 45mm |
| Thickness | 12.9mm | 8.9mm |
| Weight | 52.3g | 35g |
| Shape | Rectangle | Circular |
| Water Resistance | 5 ATM | 5 ATM |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Screen size | 1.91 inches | 1.46 inches |
| Battery life | 5 days | 7 days |
| Released | 2023 | 2025 |
Every specification
115 specs| Spec | Oppo Watch 4 Pro | Oppo Watch S |
|---|---|---|
| Design | ||
| width | 38.3 | 45 |
| height | 50.1 | 45 |
| volume | 24.75 cm³ | 18.02 cm³ |
| weight | 52.3 g | 35 g |
| thickness | 12.9 | 8.9 |
| ATM rating | 5 ATM | 5 ATM |
| resolution | 378 x 496 px | 464 x 464 px |
| screen size | 1.91 inches | 1.46 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 326 ppi | 317 ppi |
| water resistance | Water resistant | Waterproof |
| Always-On Display | Yes | No |
| has a touch screen | Yes | Yes |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | No | No |
| has branded damage-resistant glass | No | No |
| width of band | — | 22 mm |
| is designed for kids | — | No |
| waterproof depth rating | — | 1.5 m |
| Ingress Protection (IP) rating | — | IP68 |
| Battery | ||
| charge time | 1 hours | — |
| battery life | 5 days | 7 days |
| battery power | 570 mAh | 339 mAh |
| has wireless charging | No | No |
| has a removable battery | No | No |
| Has a solar power battery | No | No |
| has a rechargeable battery | Yes | Yes |
| battery life in training mode | 60 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 | — |
| release date | 2023-08-29 | 2025-10-16 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| Has call control | Yes | Yes |
| Has silent alarm | Yes | Yes |
| internal storage | 32GB | 4GB |
| Has notifications | Yes | Yes |
| Has ECG technology | Yes | Yes |
| Locates your phone | Yes | No |
| has fall detection | Yes | No |
| has voice commands | Yes | Yes |
| Acquires GPS faster | No | Yes |
| Has vibrating alerts | Yes | Yes |
| number of microphones | 1 | 0 |
| Can be used to answer calls | Yes | Yes |
| has irregular heart rate warnings | Yes | Yes |
| Has a built-in camera remote control function | Yes | Yes |
| warranty period | — | 1 years |
| has HRV tracking | — | Yes |
| measures VO2 max | — | Yes |
| has a front camera | — | No |
| shows readiness level | — | Yes |
| measures resting heart rate | — | Yes |
| has fast/slow heart rate notifications | — | Yes |
| Connectivity | ||
| has NFC | Yes | No |
| SIM cards | 1 eSIM | — |
| Wi-Fi version | Wi-Fi 4 (802.11n) | — |
| supports ANT+ | No | No |
| supports Wi-Fi | Yes | No |
| Bluetooth version | 5 | 5.2 |
| has a cellular module | Yes | No |
| Is compatible with iOS | Yes | Yes |
| Is compatible with Android | Yes | Yes |
| supports Galileo | — | Yes |
| Miscellaneous | ||
| Has passcode | No | Yes |
| Has auto pause | 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 | Yes |
| Compatible with external heart rate monitors | No | — |
| Is compatible with Windows | — | No |
| Is compatible with Mac OS X | — | No |
| App & Software | ||
| Ad-free | Yes | Yes |
| Free app | Yes | Yes |
| Has coaching | No | No |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has exercise diary | Yes | Yes |
| Predicts ovulation | Yes | — |
| Has weight tracking | Yes | Yes |
| Predicts start date | Yes | — |
| Tracks water intake | Yes | Yes |
| Has inactivity alerts | Yes | Yes |
| Has period notifications | Yes | Yes |
| Has temperature tracking | Yes | Yes |
| Doesn’t require account | No | No |
| Provides activity reports | Yes | Yes |
| Displays fertile window notifications | Yes | — |
| Counts how many calories you've burned | Yes | Yes |
| Supports routes | — | No |
| Can be personalised | — | 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 | No | No |
| Has a route tracker | Yes | Yes |
| Has exercise tagging | Yes | Yes |
| Has multi-sport mode | 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
Oppo Watch 4 Pro
Sits best on wrists ~53–72mm wide (≈ 14.2–19.2cm circumference).
Oppo Watch S
Sits best on wrists ~47–64mm wide (≈ 12.6–17.1cm circumference).
Frequently Asked Questions
Is the Oppo Watch 4 Pro bigger than the Oppo Watch S?
The Oppo Watch S is bigger — 45mm vs 38.3mm case width.
Which fits a smaller wrist better, the Oppo Watch 4 Pro or the Oppo Watch S?
The Oppo Watch 4 Pro suits wrists around 53–72mm wide, and the Oppo Watch S around 47–64mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Oppo Watch 4 Pro and Oppo Watch S 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.