Garmin
Fenix 7S Pro Sapphire Solar vs Venu 3S
Size, specs & wrist fit compared
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Which one fits you
Both need much the same wrist — roughly 43–60mm across the flat of the wrist. Neither will fit where the other won't, so decide on thickness, weight and features instead.
The Fenix 7S Pro Sapphire Solar wears larger than the Venu 3S (42mm vs 41mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Venu 3S is the slimmer of the two (12mm vs 14.1mm), so it slides under a cuff more easily.
On the wrist the Venu 3S feels lighter (40g vs 65g, case only).
Among the 661 42mm watches we hold thickness for, the Fenix 7S Pro Sapphire Solar is thicker than 80% — it will sit high even though the case width reads modest.
The Venu 3S is middle-of-the-pack for thickness among the 374 41mm watches in the database.
The Fenix 7S Pro Sapphire Solar is 1mm wider, 1mm longer, 2.1mm thicker and 25g heavier than the Venu 3S. Both are circular.
Fenix 7S Pro Sapphire Solar
Venu 3S
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Garmin
Fenix 7S Pro Sapphire Solar
Garmin
Venu 3S
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
- Garmin Fenix 7S Pro Sapphire Solar42mm · 14.1mm thick
- Garmin Venu 3S41mm · 12mm thick
3D preview
Fenix 7S Pro Sapphire Solar vs Venu 3S 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 GPS mode, where the Fenix 7S Pro Sapphire Solar lasts 2.2× as long as the Venu 3S (46 hours against 21 hours).
Fenix 7S Pro Sapphire SolarVenu 3S
Battery Saver
—480 hoursSmartwatch
14 days10 daysGPS
46 hours21 hoursTraining
7 hours—
Specifications
The short version
10 key specs| Spec | GarminFenix 7S Pro Sapphire Solar | GarminVenu 3S |
|---|---|---|
| Case Width | 42mm | 41mm |
| Thickness | 14.1mm | 12mm |
| Weight | 65g | 40g |
| Shape | Circular | Circular |
| Water Resistance | 10 ATM | 5 ATM |
| GPS | Yes | Yes |
| Display type | LCD | OLED/AMOLED |
| Screen size | 1.2 inches | 1.2 inches |
| Battery life | 14 days | 10 days |
| Released | 2023 | 2023 |
Every specification
123 specs| Spec | Garmin Fenix 7S Pro Sapphire Solar | Garmin Venu 3S |
|---|---|---|
| Design | ||
| width | 42 | 41 |
| height | 42 | 41 |
| volume | 24.87 cm³ | 20.17 cm³ |
| weight | 65 g | 40 g |
| thickness | 14.1 | 12 |
| ATM rating | 10 ATM | 5 ATM |
| resolution | 240 x 240 px | 390 x 390 px |
| screen size | 1.2 inches | 1.2 inches |
| Display type | LCD | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 282 ppi | 459 ppi |
| width of band | 20 mm | 18 mm |
| water resistance | Waterproof | Waterproof |
| Always-On Display | Yes | Yes |
| has a touch screen | Yes | Yes |
| is designed for kids | No | No |
| waterproof depth rating | 100 m | 50 m |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | Yes | No |
| has branded damage-resistant glass | No | Yes |
| Gorilla Glass version | — | Gorilla Glass 3 |
| maximum operating temperature | — | 50 °C |
| lowest potential operating temperature | — | -20 °C |
| Battery | ||
| battery life | 14 days | 10 days |
| has wireless charging | No | No |
| has a removable battery | No | No |
| battery life with GPS on | 46 hours | 21 hours |
| Has a solar power battery | Yes | No |
| has a rechargeable battery | Yes | Yes |
| battery life in training mode | 7 hours | — |
| charge time | — | 1 hours |
| battery life in power save mode | — | 480 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 | Yes |
| Monitors blood oxygenation levels | Yes | Yes |
| Features | ||
| release date | 2023-05-31 | 2023-08-30 |
| 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 | 8GB |
| measures VO2 max | Yes | Yes |
| Has notifications | Yes | Yes |
| Has ECG technology | No | Yes |
| Locates your phone | Yes | Yes |
| has fall detection | Yes | Yes |
| has voice commands | No | No |
| Acquires GPS faster | Yes | Yes |
| Has vibrating alerts | Yes | Yes |
| shows readiness level | Yes | No |
| Can be used to answer calls | No | Yes |
| measures resting heart rate | Yes | Yes |
| has irregular heart rate warnings | No | Yes |
| has fast/slow heart rate notifications | Yes | Yes |
| Has a built-in camera remote control function | No | No |
| has a front camera | — | No |
| Connectivity | ||
| has NFC | Yes | Yes |
| supports ANT+ | Yes | Yes |
| supports Wi-Fi | Yes | Yes |
| supports Galileo | Yes | Yes |
| has a cellular module | No | No |
| Is compatible with iOS | Yes | Yes |
| Is compatible with Android | Yes | Yes |
| Miscellaneous | ||
| Has auto pause | Yes | Yes |
| Available on PC | Yes | Yes |
| Can upload maps | Yes | — |
| Has trackback mode | Yes | — |
| Has a wind speed sensor | Yes | — |
| Is compatible with Windows | Yes | Yes |
| Is compatible with Mac OS X | Yes | Yes |
| has an external memory slot | No | No |
| Compatible with smart scales | Yes | Yes |
| has a battery level indicator | Yes | Yes |
| Provides the sunrise/sunset time | Yes | — |
| has a socket for a 3.5 mm audio jack | No | No |
| Informs about the risk of thunderstorms | Yes | — |
| Compatible with external heart rate monitors | Yes | Yes |
| has aptX | — | No |
| App & Software | ||
| Ad-free | Yes | Yes |
| Free app | Yes | Yes |
| Tracks BMI | Yes | Yes |
| Has coaching | Yes | Yes |
| Includes maps | Yes | Yes |
| Supports routes | Yes | Yes |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has live tracking | 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 |
| 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 | 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 | Yes | Yes |
| 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 | No |
| 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
Garmin Fenix 7S Pro Sapphire Solar
Sits best on wrists ~44–60mm wide (≈ 11.7–16.0cm circumference).
Garmin Venu 3S
Sits best on wrists ~43–59mm wide (≈ 11.5–15.8cm circumference).
Frequently Asked Questions
Is the Garmin Fenix 7S Pro Sapphire Solar bigger than the Garmin Venu 3S?
The Garmin Fenix 7S Pro Sapphire Solar is bigger — 42mm vs 41mm case width.
Which fits a smaller wrist better, the Garmin Fenix 7S Pro Sapphire Solar or the Garmin Venu 3S?
The Garmin Fenix 7S Pro Sapphire Solar suits wrists around 44–60mm wide, and the Garmin Venu 3S around 43–59mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Garmin Fenix 7S Pro Sapphire Solar and Garmin Venu 3S 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.