Xiaomi Watch 2 vs Watch S3
Size, specs & wrist fit compared
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Which one fits you
Both need much the same wrist — roughly 49–68mm 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 wears larger than the Watch 2 (47mm vs 45.9mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
On the wrist the Watch 2 feels lighter (36.8g vs 44g, case only).
The Watch 2 is thinner than 82% of the 46mm watches we track and the Watch S3 than 76% of the 47mm ones — so both wear flatter than their widths suggest.
The Watch S3 is 1.1mm wider, 0.5mm shorter, 0.2mm thicker and 7.2g heavier than the Watch 2. Both are circular.
Watch 2
Watch S3
Switch or add watches
Xiaomi
Watch 2
Xiaomi
Watch S3
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.
Xiaomi Watch 2
Case 45.9mm · Lug-to-lug 47.5mm · Thickness 11.8mm · 37g
Sweet Spot
47.5mm on a 55mm wrist
47.5mm across a wrist that has the room for it, and nothing else about the case argues with the size.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 47.5mm.
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 wrist11.8mm off the skin
Normal sports-watch height for a wrist this size. (11.8mm case, back against the skin)
- How it seats~5.6mm under the rim
Seats well, with the case back following most of the wrist.
- Weight on the wrist37g
Light enough to forget you have it on. (0.7g per mm of wrist)
Xiaomi Watch S3
Case 47.0mm · Lug-to-lug 47.0mm · Thickness 12.0mm · 44g
Sweet Spot
47mm on a 55mm wrist
Across the wrist it works — 4.0mm 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 47mm.
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 wrist4.0mm 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~6.1mm under the rim
Wide enough that the edge of the case back lifts clear of the skin.
- Weight on the wrist44g
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.
- Xiaomi Watch 245.9mm × 47.5mm · 11.8mm thick
- Xiaomi Watch S347mm · 12mm thick
3D preview
Watch 2 vs Watch S3 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 S3 lasts 6.8× as long as the 2 (15 days against 2.2 days).
2S3
Smartwatch
2.2 days15 daysTraining
—3 hoursGPS
—3 hours
Specifications
The short version
11 key specs| Spec | XiaomiWatch 2 | XiaomiWatch S3 |
|---|---|---|
| Case Width | 45.9mm | 47mm |
| Lug-to-Lug | 47.5mm | 47mm |
| Thickness | 11.8mm | 12mm |
| Weight | 36.8g | 44g |
| 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 | 2.2 days | 15 days |
| Released | 2024 | 2023 |
Every specification
112 specs| Spec | Xiaomi Watch 2 | Xiaomi Watch S3 |
|---|---|---|
| Design | ||
| width | 45.9 | 47 |
| height | 47.5 | 47 |
| volume | 25.73 cm³ | 26.51 cm³ |
| weight | 36.8 g | 44 g |
| thickness | 11.8 | 12 |
| 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 | 50 m |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | No | No |
| has branded damage-resistant glass | No | No |
| maximum operating temperature | — | 45 °C |
| lowest potential operating temperature | — | -10 °C |
| Battery | ||
| charge time | 0.75 hours | 0.83 hours |
| battery life | 2.2 days | 15 days |
| battery power | 495 mAh | 486 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 with GPS on | — | 3 hours |
| 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 | Yes | No |
| Monitors blood oxygenation levels | Yes | Yes |
| Features | ||
| RAM | 2GB | 32MB |
| release date | 2024-02-20 | 2023-10-26 |
| 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 | 32GB | 4GB |
| Has notifications | Yes | Yes |
| Has ECG technology | No | No |
| Locates your phone | Yes | Yes |
| has fall detection | Yes | Yes |
| has voice commands | 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 |
| measures VO2 max | — | Yes |
| Acquires GPS faster | — | Yes |
| Connectivity | ||
| has NFC | Yes | Yes |
| supports ANT+ | No | No |
| supports Wi-Fi | Yes | No |
| supports Galileo | Yes | Yes |
| Bluetooth version | 5.2 | 5.2 |
| has a cellular module | No | No |
| Is compatible with iOS | No | Yes |
| Is compatible with Android | Yes | Yes |
| Miscellaneous | ||
| Has passcode | Yes | No |
| 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 | Yes |
| Compatible with external heart rate monitors | — | Yes |
| App & Software | ||
| Ad-free | Yes | — |
| Free app | Yes | Yes |
| Tracks BMI | Yes | — |
| Has coaching | No | No |
| 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 |
| number of exercises | 161 | 150 |
| Has inactivity alerts | Yes | Yes |
| Has temperature tracking | Yes | No |
| Doesn’t require account | No | No |
| Provides activity reports | Yes | Yes |
| Counts how many calories you've burned | Yes | 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 | 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 | — |
| Tracks calorie intake | Yes | Yes |
| Provides sleep reports | Yes | Yes |
| Detects activities automatically | Yes | Yes |
| Has a stroke counter for swimming | No | No |
Wrist Fit
Xiaomi Watch 2
Sits best on wrists ~50–68mm wide (≈ 13.4–18.2cm circumference).
Xiaomi Watch S3
Sits best on wrists ~49–67mm wide (≈ 13.1–17.9cm circumference).
Frequently Asked Questions
Is the Xiaomi Watch 2 bigger than the Xiaomi Watch S3?
The Xiaomi Watch S3 is bigger — 47mm vs 45.9mm case width.
Which fits a smaller wrist better, the Xiaomi Watch 2 or the Xiaomi Watch S3?
The Xiaomi Watch 2 suits wrists around 50–68mm wide, and the Xiaomi Watch S3 around 49–67mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Xiaomi Watch 2 and Xiaomi Watch S3 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.