Samsung Galaxy Watch FE 40mm vs Vivo IQOO Watch GT 45.8mm
Size, specs & wrist fit compared
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Which one fits you
On wrists narrower than about 48mm, the Samsung Galaxy Watch FE 40mm is the safer pick — it stays proportionate down to roughly 43mm, where the Vivo IQOO Watch GT 45.8mm starts to hang over the edge. Above 48mm both sit cleanly, and the Vivo IQOO Watch GT 45.8mm gives you more presence.
The Samsung Galaxy Watch FE 40mm and Vivo IQOO Watch GT 45.8mm share a near-identical 39.3mm case, so wrist presence comes down to thickness, lug-to-lug and weight.
The Samsung Galaxy Watch FE 40mm is the slimmer of the two (9.8mm vs 11.2mm), so it slides under a cuff more easily.
On the wrist the Samsung Galaxy Watch FE 40mm feels lighter (26.6g vs 33g, case only).
Among the 405 39mm watches we hold thickness for, the Samsung Galaxy Watch FE 40mm is thinner than 73%, so it wears flatter than its width suggests.
The Vivo IQOO Watch GT 45.8mm is middle-of-the-pack for thickness among the 561 40mm watches in the database.
The Vivo IQOO Watch GT 45.8mm is 0.3mm wider, 5.4mm longer, 1.4mm thicker and 6.4g heavier than the Samsung Galaxy Watch FE 40mm.
Samsung
Galaxy Watch FE - 40mm
Vivo
iQOO Watch GT - 45.8mm
Switch or add watches
Samsung
Galaxy Watch FE - 40mm
Vivo
iQOO Watch GT - 45.8mm
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.
Samsung Galaxy Watch FE - 40mm
Case 39.3mm · Lug-to-lug 40.4mm · Thickness 9.8mm · 27g
Balanced Fit
40.4mm on a 55mm wrist
Comfortably inside the edges of your wrist, and it seats and sits low enough to wear without thinking about it.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 40.4mm, so you could go bigger.
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 wrist7.3mm spare each side
Comfortable, with visible skin either side.
- Off the wrist9.8mm off the skin
Normal sports-watch height for a wrist this size. (9.8mm case, back against the skin)
- How it seats~3.2mm under the rim
Seats well, with the case back following most of the wrist.
- Weight on the wrist27g
Light enough to forget you have it on. (0.5g per mm of wrist)
Vivo iQOO Watch GT - 45.8mm
Case 45.8mm · Lug-to-lug 45.8mm · Thickness 11.2mm · 33g
Balanced Fit
45.8mm on a 55mm wrist
Comfortably inside the edges of your wrist, and it seats and sits low enough to wear without thinking about it.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 45.8mm, so you could go bigger.
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 wrist4.6mm spare each side
Comfortable, with visible skin either side.
- Off the wrist11.2mm off the skin
Normal sports-watch height for a wrist this size. (11.2mm case, back against the skin)
- How it seats~5.5mm under the rim
Seats well, with the case back following most of the wrist.
- Weight on the wrist33g
Light enough to forget you have it on. (0.6g per mm of wrist)
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
- Samsung Galaxy Watch FE - 40mm39.3mm × 40.4mm · 9.8mm thick
- Vivo iQOO Watch GT - 45.8mm39.6mm × 45.8mm · 11.2mm thick
3D preview
Samsung Galaxy Watch FE - 40mm vs Vivo iQOO Watch GT - 45.8mm 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 Vivo IQOO Watch GT 45.8mm lasts 23.3× as long as the Samsung Galaxy Watch FE 40mm (21 days against 21.6 hours).
Samsung Galaxy Watch FE 40mmVivo IQOO Watch GT 45.8mm
Smartwatch
0.9 days21 days
Specifications
The short version
11 key specs| Spec | SamsungGalaxy Watch FE - 40mm | VivoiQOO Watch GT - 45.8mm |
|---|---|---|
| Case Width | 39.3mm | 39.6mm |
| Lug-to-Lug | 40.4mm | 45.8mm |
| Thickness | 9.8mm | 11.2mm |
| Weight | 26.6g | 33g |
| Shape | Circular | Rectangle |
| Water Resistance | 5 ATM | Water resistant |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Screen size | 1.2 inches | 1.85 inches |
| Battery life | 0.9 days | 21 days |
| Released | 2024 | 2024 |
Every specification
115 specs| Spec | Samsung Galaxy Watch FE - 40mm | Vivo iQOO Watch GT - 45.8mm |
|---|---|---|
| Design | ||
| width | 39.3 | 39.6 |
| height | 40.4 | 45.8 |
| volume | 15.56 cm³ | 20.31 cm³ |
| weight | 26.6 g | 33 g |
| thickness | 9.8 | 11.2 |
| ATM rating | 5 ATM | — |
| resolution | 396 x 396 px | 1.85 x 450 px |
| screen size | 1.2 inches | 1.85 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 330 ppi | 322 ppi |
| width of band | 20 mm | 22 mm |
| 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 | — |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | Yes | No |
| Ingress Protection (IP) rating | IP68 | — |
| has branded damage-resistant glass | No | No |
| Battery | ||
| charge time | 2 hours | — |
| battery life | 0.9 days | 21 days |
| battery power | 247 mAh | 505 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 |
| Sensors | ||
| has GPS | Yes | Yes |
| has a compass | Yes | Yes |
| Has a barometer | Yes | No |
| 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 | No |
| Monitors blood oxygenation levels | Yes | Yes |
| Features | ||
| RAM | 1.5GB | — |
| release date | 2024-06-13 | 2024-07-12 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| warranty period | 1 years | — |
| Has call control | Yes | Yes |
| Has silent alarm | Yes | Yes |
| has HRV tracking | Yes | — |
| internal storage | 16GB | — |
| measures VO2 max | Yes | — |
| Has notifications | Yes | Yes |
| Has ECG technology | Yes | No |
| Locates your phone | Yes | Yes |
| has a front camera | No | No |
| has fall detection | Yes | No |
| has voice commands | Yes | No |
| Acquires GPS faster | Yes | No |
| Has vibrating alerts | Yes | Yes |
| number of microphones | 1 | 1 |
| shows readiness level | 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 | — |
| Has a built-in camera remote control function | Yes | Yes |
| Connectivity | ||
| has NFC | Yes | Yes |
| Wi-Fi version | Wi-Fi 4 (802.11n) | — |
| supports ANT+ | No | No |
| supports Wi-Fi | Yes | No |
| supports Galileo | Yes | Yes |
| Bluetooth version | 5 | 5.3 |
| has a cellular module | Yes | Yes |
| Is compatible with iOS | No | Yes |
| Is compatible with Android | Yes | Yes |
| SIM cards | — | 1 eSIM |
| Miscellaneous | ||
| Has passcode | Yes | No |
| Has auto pause | Yes | No |
| Is compatible with Windows | No | No |
| Is compatible with Mac OS X | No | No |
| has an external memory slot | No | No |
| Compatible with smart scales | Yes | — |
| 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 | No |
| App & Software | ||
| Ad-free | Yes | No |
| Free app | Yes | Yes |
| Tracks BMI | Yes | — |
| Has coaching | Yes | Yes |
| Supports routes | Yes | — |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has exercise diary | 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 | No | No |
| Provides activity reports | Yes | Yes |
| Counts how many calories you've burned | Yes | Yes |
| Predicts ovulation | — | Yes |
| Can be personalised | — | 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 | No |
| Tracks calorie intake | Yes | Yes |
| Provides sleep reports | Yes | Yes |
| Detects activities automatically | Yes | Yes |
| Has a stroke counter for swimming | Yes | — |
Wrist Fit
Samsung Galaxy Watch FE 40mm
Sits best on wrists ~43–58mm wide (≈ 11.5–15.5cm circumference).
Vivo IQOO Watch GT 45.8mm
Sits best on wrists ~48–65mm wide (≈ 12.8–17.4cm circumference).
Frequently Asked Questions
Is the Samsung Galaxy Watch FE 40mm bigger than the Vivo IQOO Watch GT 45.8mm?
The Vivo IQOO Watch GT 45.8mm is bigger — 39.6mm vs 39.3mm case width.
Which fits a smaller wrist better, the Samsung Galaxy Watch FE 40mm or the Vivo IQOO Watch GT 45.8mm?
The Samsung Galaxy Watch FE 40mm suits wrists around 43–58mm wide, and the Vivo IQOO Watch GT 45.8mm around 48–65mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Samsung Galaxy Watch FE 40mm and Vivo IQOO Watch GT 45.8mm 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.