Xiaomi
Watch S3 vs Watch S4 Sport
Size, specs & wrist fit compared
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Which one fits you
Both need much the same wrist — roughly 49–67mm across the flat of the wrist. Neither will fit where the other won't, so decide on thickness, weight and features instead.
The Watch S3 and Watch S4 Sport share a near-identical 47mm case, so wrist presence comes down to thickness, lug-to-lug and weight.
The Watch S3 is the slimmer of the two (12mm vs 12.6mm), so it slides under a cuff more easily.
On the wrist the Watch S3 feels lighter (44g vs 49g, case only).
Among the 91 47mm watches we hold thickness for, the Watch S3 is thinner than 74%, so it wears flatter than its width suggests.
The Watch S4 Sport is middle-of-the-pack for thickness among the 97 47mm watches in the database.
The Watch S3 is 0.1mm wider, 0.1mm longer, 0.6mm thinner and 5g lighter than the Watch S4 Sport. Both are circular.
Watch S3
Watch S4 Sport
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Xiaomi
Watch S3
Xiaomi
Watch S4 Sport
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
- Xiaomi Watch S347mm · 12mm thick
- Xiaomi Watch S4 Sport46.9mm · 12.6mm thick
3D preview
Watch S3 vs Watch S4 Sport 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.
S3S4 Sport
Smartwatch
15 days15 daysTraining
3 hours—GPS
3 hours—
Specifications
The short version
10 key specs| Spec | XiaomiWatch S3 | XiaomiWatch S4 Sport |
|---|---|---|
| Case Width | 47mm | 46.9mm |
| Thickness | 12mm | 12.6mm |
| Weight | 44g | 49g |
| Shape | Circular | Circular |
| Water Resistance | 5 ATM | 5 ATM |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Screen size | 1.43 inches | 1.43 inches |
| Battery life | 15 days | 15 days |
| Released | 2023 | 2024 |
Every specification
116 specs| Spec | Xiaomi Watch S3 | Xiaomi Watch S4 Sport |
|---|---|---|
| Design | ||
| width | 47 | 46.9 |
| height | 47 | 46.9 |
| volume | 26.51 cm³ | 27.72 cm³ |
| weight | 44 g | 49 g |
| thickness | 12 | 12.6 |
| ATM rating | 5 ATM | 5 ATM |
| resolution | 466 x 466 px | 466 x 466 px |
| screen size | 1.43 inches | 1.43 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 326 ppi | 326 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 | 40 m |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | No | Yes |
| maximum operating temperature | 45 °C | — |
| has branded damage-resistant glass | No | No |
| lowest potential operating temperature | -10 °C | — |
| width of band | — | 22 mm |
| Battery | ||
| charge time | 0.83 hours | — |
| battery life | 15 days | 15 days |
| battery power | 486 mAh | 586 mAh |
| has wireless charging | No | Yes |
| has a removable battery | No | No |
| battery life with GPS on | 3 hours | — |
| Has a solar power battery | No | No |
| has a rechargeable battery | Yes | Yes |
| battery life in training mode | 3 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 | No | Yes |
| Monitors blood oxygenation levels | Yes | Yes |
| Features | ||
| RAM | 32MB | — |
| release date | 2023-10-26 | 2024-07-19 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| warranty period | 1 years | 1 years |
| Has call control | Yes | Yes |
| Has silent alarm | Yes | Yes |
| internal storage | 4GB | 32GB |
| measures VO2 max | Yes | Yes |
| Has notifications | Yes | Yes |
| Has ECG technology | No | No |
| Locates your phone | Yes | Yes |
| has fall detection | Yes | No |
| has voice commands | Yes | Yes |
| Acquires GPS faster | Yes | Yes |
| Has vibrating alerts | Yes | Yes |
| number of microphones | 1 | 1 |
| Can be used to answer calls | Yes | Yes |
| measures resting heart rate | Yes | Yes |
| has irregular heart rate warnings | No | No |
| has fast/slow heart rate notifications | Yes | Yes |
| Has a built-in camera remote control function | Yes | Yes |
| has HRV tracking | — | Yes |
| has a front camera | — | No |
| shows readiness level | — | Yes |
| Connectivity | ||
| has NFC | Yes | Yes |
| supports ANT+ | No | No |
| supports Wi-Fi | No | No |
| supports Galileo | Yes | Yes |
| Bluetooth version | 5.2 | 5.2 |
| has a cellular module | No | Yes |
| Is compatible with iOS | Yes | Yes |
| Is compatible with Android | Yes | Yes |
| SIM cards | — | 1 eSIM |
| Miscellaneous | ||
| Has passcode | No | 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 | Yes | No |
| Compatible with external heart rate monitors | Yes | — |
| App & Software | ||
| Free app | Yes | Yes |
| Has coaching | No | No |
| Supports routes | Yes | No |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has exercise diary | Yes | Yes |
| Predicts ovulation | Yes | Yes |
| Can be personalised | Yes | Yes |
| Has weight tracking | Yes | Yes |
| Predicts start date | Yes | Yes |
| Tracks water intake | Yes | Yes |
| number of exercises | 150 | — |
| Has inactivity alerts | Yes | Yes |
| Has period notifications | Yes | Yes |
| Has temperature tracking | No | 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 |
| Ad-free | — | Yes |
| Includes maps | — | 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 | Yes |
| Has a route tracker | Yes | Yes |
| Has exercise tagging | Yes | 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
Xiaomi Watch S3
Sits best on wrists ~49–67mm wide (≈ 13.1–17.9cm circumference).
Xiaomi Watch S4 Sport
Sits best on wrists ~49–67mm wide (≈ 13.1–17.9cm circumference).
Frequently Asked Questions
Is the Xiaomi Watch S3 bigger than the Xiaomi Watch S4 Sport?
The Xiaomi Watch S3 is bigger — 47mm vs 46.9mm case width.
Which fits a smaller wrist better, the Xiaomi Watch S3 or the Xiaomi Watch S4 Sport?
The Xiaomi Watch S3 suits wrists around 49–67mm wide, and the Xiaomi Watch S4 Sport around 49–67mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Xiaomi Watch S3 and Xiaomi Watch S4 Sport 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.