Xiaomi
Redmi Watch 4 vs Watch S4 41mm
Size, specs & wrist fit compared
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Which one fits you
On wrists narrower than about 50mm, the Watch S4 41mm is the safer pick — it stays proportionate down to roughly 43mm, where the Redmi Watch 4 starts to hang over the edge. Above 50mm both sit cleanly, and the Redmi Watch 4 gives you more presence.
The Redmi Watch 4 and Watch S4 41mm share a near-identical 41.1mm case, so wrist presence comes down to thickness, lug-to-lug and weight.
The Watch S4 41mm is the slimmer of the two (9.5mm vs 10.5mm), so it slides under a cuff more easily.
The Redmi Watch 4 is thinner than 86% of the 372 41mm watches we hold thickness for, the Watch S4 41mm than 98% — so both wear flatter than their widths suggest.
The Watch S4 41mm is 0.1mm wider, 6.4mm shorter, 1mm thinner and 0.5g heavier than the Redmi Watch 4.
Redmi Watch 4
Watch S4 41mm
Switch or add watches
Xiaomi
Redmi Watch 4
Xiaomi
Watch S4 41mm
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
- Xiaomi Redmi Watch 441.1mm × 47.6mm · 10.5mm thick
- Xiaomi Watch S4 41mm41.2mm · 9.5mm thick
3D preview
Redmi Watch 4 vs Watch S4 41mm 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 Redmi Watch 4 lasts 2.5× as long as the Watch S4 41mm (20 days against 8 days).
Redmi Watch 4Watch S4 41mm
Battery Saver
720 hours—Smartwatch
20 days8 days
Specifications
The short version
11 key specs| Spec | XiaomiRedmi Watch 4 | XiaomiWatch S4 41mm |
|---|---|---|
| Case Width | 41.1mm | 41.2mm |
| Lug-to-Lug | 47.58mm | 41.2mm |
| Thickness | 10.5mm | 9.5mm |
| Weight | 31.5g | 32g |
| Shape | Rectangle | Circular |
| Water Resistance | 5 ATM | 5 ATM |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Screen size | 1.97 inches | 1.32 inches |
| Battery life | 20 days | 8 days |
| Released | 2023 | 2025 |
Every specification
113 specs| Spec | Xiaomi Redmi Watch 4 | Xiaomi Watch S4 41mm |
|---|---|---|
| Design | ||
| width | 41.1 | 41.2 |
| height | 47.58 | 41.2 |
| volume | 20.53 cm³ | 16.13 cm³ |
| weight | 31.5 g | 32 g |
| thickness | 10.5 | 9.5 |
| ATM rating | 5 ATM | 5 ATM |
| resolution | 390 x 450 px | 466 x 466 px |
| screen size | 1.97 inches | 1.32 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 302 ppi | 320 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 | — |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | No | Yes |
| Ingress Protection (IP) rating | IP68 | — |
| has branded damage-resistant glass | No | No |
| Battery | ||
| charge time | 1.4 hours | — |
| battery life | 20 days | 8 days |
| battery power | 470 mAh | 320 mAh |
| has wireless charging | Yes | No |
| 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 | 720 hours | — |
| Sensors | ||
| has GPS | Yes | Yes |
| has a compass | Yes | Yes |
| Has a barometer | No | Yes |
| has a gyroscope | Yes | Yes |
| 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 |
| Has a cadence sensor | — | No |
| Features | ||
| release date | 2023-11-29 | 2025-06-26 |
| 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 |
| has HRV tracking | Yes | Yes |
| Has notifications | Yes | Yes |
| Has ECG technology | No | No |
| Locates your phone | Yes | Yes |
| has fall detection | No | Yes |
| has voice commands | No | 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 a built-in camera remote control function | Yes | Yes |
| internal storage | — | 32GB |
| measures VO2 max | — | Yes |
| has a front camera | — | No |
| Acquires GPS faster | — | Yes |
| shows readiness level | — | Yes |
| has fast/slow heart rate notifications | — | Yes |
| Connectivity | ||
| has NFC | Yes | Yes |
| supports Wi-Fi | No | No |
| supports Galileo | Yes | Yes |
| Bluetooth version | 5.3 | 5.4 |
| has a cellular module | No | Yes |
| Is compatible with iOS | Yes | Yes |
| Is compatible with Android | Yes | Yes |
| SIM cards | — | 1 eSIM |
| supports ANT+ | — | No |
| 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 | No | No |
| Compatible with external heart rate monitors | Yes | — |
| App & Software | ||
| Free app | Yes | Yes |
| Has coaching | Yes | 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 | 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 | Yes | Yes |
Wrist Fit
Xiaomi Redmi Watch 4
Sits best on wrists ~50–68mm wide (≈ 13.4–18.2cm circumference).
Xiaomi Watch S4 41mm
Sits best on wrists ~43–59mm wide (≈ 11.5–15.8cm circumference).
Frequently Asked Questions
Is the Xiaomi Redmi Watch 4 bigger than the Xiaomi Watch S4 41mm?
The Xiaomi Watch S4 41mm is bigger — 41.2mm vs 41.1mm case width.
Which fits a smaller wrist better, the Xiaomi Redmi Watch 4 or the Xiaomi Watch S4 41mm?
The Xiaomi Redmi Watch 4 suits wrists around 50–68mm wide, and the Xiaomi Watch S4 41mm around 43–59mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Xiaomi Redmi Watch 4 and Xiaomi Watch S4 41mm 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.