Xiaomi Redmi Watch 4 vs Redmi Watch 5 Active
Size, specs & wrist fit compared
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Which one fits you
On wrists narrower than about 52mm, the Redmi Watch 4 is the safer pick — it stays proportionate down to roughly 50mm, where the Redmi Watch 5 Active starts to hang over the edge. Above 52mm both sit cleanly, and the Redmi Watch 5 Active gives you more presence.
The Redmi Watch 4 wears larger than the Redmi Watch 5 Active (41.1mm vs 40.4mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Redmi Watch 4 is the slimmer of the two (10.5mm vs 11.4mm), so it slides under a cuff more easily.
On the wrist the Redmi Watch 4 feels lighter (31.5g vs 42.2g, case only).
Among the 373 41mm watches we hold thickness for, the Redmi Watch 4 is thinner than 86%, so it wears flatter than its width suggests.
Among the 509 40mm watches we hold thickness for, the Redmi Watch 5 Active is thicker than 74% — it will sit high even though the case width reads modest.
The Redmi Watch 4 is 0.7mm wider, 1.5mm shorter, 0.9mm thinner and 10.7g lighter than the Redmi Watch 5 Active. Both are rectangle.
Redmi Watch 4
Redmi Watch 5 Active
Switch or add watches
Xiaomi
Redmi Watch 4
Xiaomi
Redmi Watch 5 Active
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 Redmi Watch 4
Case 47.6mm · Lug-to-lug 47.6mm · Thickness 10.5mm · 32g
Sweet Spot
47.6mm on a 55mm wrist
Across the wrist it works — 3.7mm 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 47.6mm.
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 wrist3.7mm spare each side
Fills the wrist without reaching the edge.
- Off the wrist10.5mm off the skin
Normal sports-watch height for a wrist this size. (10.5mm case, back against the skin)
- How it seats~6.4mm under the rim
Wide enough that the edge of the case back lifts clear of the skin.
- Weight on the wrist32g
Light enough to forget you have it on. (0.6g per mm of wrist)
Xiaomi Redmi Watch 5 Active
Case 49.1mm · Lug-to-lug 49.1mm · Thickness 11.4mm · 42g
Sweet Spot
49.1mm on a 55mm wrist
Across the wrist it works — 2.9mm 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 49.1mm.
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 wrist2.9mm spare each side
Fills the wrist without reaching the edge.
- Off the wrist11.4mm off the skin
Normal sports-watch height for a wrist this size. (11.4mm case, back against the skin)
- How it seats~7.4mm under the rim
Wide enough that the edge of the case back lifts clear of the skin.
- Weight on the wrist42g
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 Redmi Watch 441.1mm × 47.6mm · 10.5mm thick
- Xiaomi Redmi Watch 5 Active40.4mm × 49.1mm · 11.4mm thick
3D preview
Redmi Watch 4 vs Redmi Watch 5 Active 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.
45 Active
Battery Saver
720 hours—Smartwatch
20 days18 daysTraining
—288 hours
Specifications
The short version
11 key specs| Spec | XiaomiRedmi Watch 4 | XiaomiRedmi Watch 5 Active |
|---|---|---|
| Case Width | 41.1mm | 40.4mm |
| Lug-to-Lug | 47.58mm | 49.1mm |
| Thickness | 10.5mm | 11.4mm |
| Weight | 31.5g | 42.2g |
| Shape | Rectangle | Rectangle |
| Water Resistance | 5 ATM | 5 ATM |
| GPS | Yes | No |
| Display type | OLED/AMOLED | LCD, IPS |
| Screen size | 1.97 inches | 2 inches |
| Battery life | 20 days | 18 days |
| Released | 2023 | 2024 |
Every specification
109 specs| Spec | Xiaomi Redmi Watch 4 | Xiaomi Redmi Watch 5 Active |
|---|---|---|
| Design | ||
| width | 41.1 | 40.4 |
| height | 47.58 | 49.1 |
| volume | 20.53 cm³ | 22.61 cm³ |
| weight | 31.5 g | 42.2 g |
| thickness | 10.5 | 11.4 |
| ATM rating | 5 ATM | 5 ATM |
| resolution | 390 x 450 px | 320 x 385 px |
| screen size | 1.97 inches | 2 inches |
| Display type | OLED/AMOLED | LCD, IPS |
| Has a display | Yes | Yes |
| pixel density | 302 ppi | 250 ppi |
| water resistance | Waterproof | Water resistant |
| 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 |
| Ingress Protection (IP) rating | IP68 | IPX8 |
| has branded damage-resistant glass | No | No |
| width of band | — | 22 mm |
| maximum operating temperature | — | 45 °C |
| lowest potential operating temperature | — | -10 °C |
| Battery | ||
| charge time | 1.4 hours | 2 hours |
| battery life | 20 days | 18 days |
| battery power | 470 mAh | 470 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 | — |
| battery life in training mode | — | 288 hours |
| Sensors | ||
| has GPS | Yes | No |
| has a compass | Yes | No |
| Has a barometer | No | No |
| 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 | No |
| Monitors blood oxygenation levels | Yes | Yes |
| Has a cadence sensor | — | Yes |
| Features | ||
| release date | 2023-11-29 | 2024-08-27 |
| 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 | — |
| Has notifications | Yes | Yes |
| Has ECG technology | No | No |
| Locates your phone | Yes | Yes |
| has fall detection | No | No |
| has voice commands | No | Yes |
| Has vibrating alerts | Yes | Yes |
| number of microphones | 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 |
| measures VO2 max | — | No |
| has a front camera | — | Yes |
| Connectivity | ||
| has NFC | Yes | No |
| supports Wi-Fi | No | No |
| supports Galileo | Yes | No |
| Bluetooth version | 5.3 | 5.3 |
| has a cellular module | No | No |
| Is compatible with iOS | Yes | Yes |
| Is compatible with Android | Yes | Yes |
| Miscellaneous | ||
| Has passcode | No | 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 | No |
| Compatible with external heart rate monitors | Yes | Yes |
| App & Software | ||
| Free app | Yes | Yes |
| Has coaching | Yes | Yes |
| Supports routes | Yes | Yes |
| 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 | No |
| Doesn’t require account | No | No |
| Provides activity reports | Yes | Yes |
| Displays fertile window notifications | Yes | Yes |
| Counts how many calories you've burned | Yes | Yes |
| Activity tracking | ||
| Measures pace | Yes | Yes |
| Tracks distance | Yes | No |
| Tracks elevation | Yes | No |
| 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 | Yes | Yes |
Wrist Fit
Xiaomi Redmi Watch 4
Sits best on wrists ~50–68mm wide (≈ 13.4–18.2cm circumference).
Xiaomi Redmi Watch 5 Active
Sits best on wrists ~52–70mm wide (≈ 13.9–18.7cm circumference).
Frequently Asked Questions
Is the Xiaomi Redmi Watch 4 bigger than the Xiaomi Redmi Watch 5 Active?
The Xiaomi Redmi Watch 4 is bigger — 41.1mm vs 40.4mm case width.
Which fits a smaller wrist better, the Xiaomi Redmi Watch 4 or the Xiaomi Redmi Watch 5 Active?
The Xiaomi Redmi Watch 4 suits wrists around 50–68mm wide, and the Xiaomi Redmi Watch 5 Active around 52–70mm. 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 Redmi Watch 5 Active 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.