Google Pixel Watch 4 - 45mm vs Xiaomi Watch S4
Size, specs & wrist fit compared
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Which one fits you
On wrists narrower than about 50mm, the Google Pixel Watch 4 - 45mm is the safer pick — it stays proportionate down to roughly 47mm, where the Xiaomi Watch S4 starts to hang over the edge. Above 50mm both sit cleanly, and the Xiaomi Watch S4 gives you more presence.
The Xiaomi Watch S4 wears larger than the Google Pixel Watch 4 - 45mm (47.3mm vs 45mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
On the wrist the Google Pixel Watch 4 - 45mm feels lighter (36.7g vs 44.5g, case only).
The Google Pixel Watch 4 - 45mm is thinner than 70% of the 45mm watches we track and the Xiaomi Watch S4 than 91% of the 47mm ones — so both wear flatter than their widths suggest.
The Xiaomi Watch S4 is 2.3mm wider, 2.3mm longer, 0.3mm thinner and 7.8g heavier than the Google Pixel Watch 4 - 45mm. Both are circular.
Pixel Watch 4 - 45mm
Xiaomi
Watch S4
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Pixel Watch 4 - 45mm
Xiaomi
Watch S4
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
- Google Pixel Watch 4 - 45mm45mm · 12.3mm thick
- Xiaomi Watch S447.3mm · 12mm thick
3D preview
Google Pixel Watch 4 - 45mm vs Xiaomi Watch S4 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 Xiaomi Watch S4 lasts 9.4× as long as the Google Pixel Watch 4 - 45mm (15 days against 38.4 hours).
Google Pixel Watch 4 - 45mmXiaomi Watch S4
Smartwatch
1.6 days15 daysBattery Saver
72 hours—
Specifications
The short version
10 key specs| Spec | GooglePixel Watch 4 - 45mm | XiaomiWatch S4 |
|---|---|---|
| Case Width | 45mm | 47.3mm |
| Thickness | 12.3mm | 12mm |
| Weight | 36.7g | 44.5g |
| Shape | Circular | Circular |
| Water Resistance | 5 ATM | 5 ATM |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Screen size | 1.4 inches | 1.43 inches |
| Battery life | 1.6 days | 15 days |
| Released | 2025 | 2024 |
Every specification
115 specs| Spec | Google Pixel Watch 4 - 45mm | Xiaomi Watch S4 |
|---|---|---|
| Design | ||
| width | 45 | 47.3 |
| height | 45 | 47.3 |
| volume | 24.91 cm³ | 26.85 cm³ |
| weight | 36.7 g | 44.5 g |
| thickness | 12.3 | 12 |
| ATM rating | 5 ATM | 5 ATM |
| resolution | 456 x 456 px | 466 x 466 px |
| screen size | 1.4 inches | 1.43 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 320 ppi | 326 ppi |
| water resistance | Waterproof | Waterproof |
| Always-On Display | Yes | Yes |
| has a touch screen | Yes | Yes |
| Gorilla Glass version | Gorilla Glass 5 | — |
| waterproof depth rating | 50 m | 50 m |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | No | Yes |
| Ingress Protection (IP) rating | IP68 | — |
| has branded damage-resistant glass | Yes | No |
| is designed for kids | — | No |
| Battery | ||
| charge time | 1.25 hours | — |
| battery life | 1.6 days | 15 days |
| battery power | 455 mAh | 486 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 | 72 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 | Yes | 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 | 2025-08-20 | 2024-10-29 |
| 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 |
| has HRV tracking | Yes | Yes |
| internal storage | 32GB | 32GB |
| measures VO2 max | Yes | Yes |
| Has notifications | Yes | Yes |
| Has ECG technology | Yes | No |
| Locates your phone | Yes | Yes |
| has fall detection | Yes | Yes |
| has voice commands | Yes | Yes |
| Acquires GPS faster | No | Yes |
| Has vibrating alerts | Yes | Yes |
| shows readiness level | Yes | Yes |
| Can be used to answer calls | Yes | Yes |
| measures resting heart rate | Yes | Yes |
| has irregular heart rate warnings | Yes | No |
| has fast/slow heart rate notifications | Yes | Yes |
| Has a built-in camera remote control function | Yes | Yes |
| has a front camera | — | No |
| number of microphones | — | 2 |
| Connectivity | ||
| has NFC | Yes | Yes |
| SIM cards | 1 eSIM | 1 eSIM |
| Wi-Fi version | Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax) | — |
| supports Wi-Fi | Yes | No |
| supports Galileo | Yes | Yes |
| Bluetooth version | 6 | 5.3 |
| has a cellular module | Yes | Yes |
| Is compatible with iOS | No | Yes |
| Is compatible with Android | Yes | Yes |
| supports ANT+ | — | No |
| 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 |
| App & Software | ||
| Ad-free | Yes | Yes |
| Free app | Yes | Yes |
| Has coaching | Yes | No |
| Includes maps | Yes | Yes |
| Supports routes | Yes | No |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has live tracking | 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 |
| 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 |
| 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 | — |
| 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
Google Pixel Watch 4 - 45mm
Sits best on wrists ~47–64mm wide (≈ 12.6–17.1cm circumference).
Xiaomi Watch S4
Sits best on wrists ~50–68mm wide (≈ 13.4–18.2cm circumference).
Frequently Asked Questions
Is the Google Pixel Watch 4 - 45mm bigger than the Xiaomi Watch S4?
The Xiaomi Watch S4 is bigger — 47.3mm vs 45mm case width.
Which fits a smaller wrist better, the Google Pixel Watch 4 - 45mm or the Xiaomi Watch S4?
The Google Pixel Watch 4 - 45mm suits wrists around 47–64mm wide, and the Xiaomi Watch S4 around 50–68mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Google Pixel Watch 4 - 45mm and Xiaomi Watch S4 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.