Samsung Galaxy Watch7 - Wi-Fi · 40mm vs Samsung Galaxy Watch8 - Wi-Fi · 40mmSize, Specs & Wrist Fit Compared
The Samsung Galaxy Watch7 - Wi-Fi · 40mm is 2.3mm shorter, 1.1mm thicker and 3.8g heavier than the Samsung Galaxy Watch8 - Wi-Fi · 40mm. Both are circular.
Measured against the Samsung Galaxy Watch7 - Wi-Fi · 40mm.
- Case width
- 40.4mmbaseGalaxy Watch7 - Wi-Fi · 40mm40.4mmsameGalaxy Watch8 - Wi-Fi · 40mm
- Lug-to-lug
- 40.4mmbaseGalaxy Watch7 - Wi-Fi · 40mm42.7mm+2.3mmGalaxy Watch8 - Wi-Fi · 40mm
- Thickness
- 9.7mmbaseGalaxy Watch7 - Wi-Fi · 40mm8.6mm−1.1mmGalaxy Watch8 - Wi-Fi · 40mm
- Weight
- 33.8gbaseGalaxy Watch7 - Wi-Fi · 40mm30g−3.8gGalaxy Watch8 - Wi-Fi · 40mm
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Samsung
Galaxy Watch7 - Wi-Fi · 40mm
Samsung
Galaxy Watch8 - Wi-Fi · 40mm
Which one fits you
On wrists narrower than about 45mm, the Samsung Galaxy Watch7 - Wi-Fi · 40mm is the safer pick — it stays proportionate down to roughly 43mm, where the Samsung Galaxy Watch8 - Wi-Fi · 40mm starts to hang over the edge. Above 45mm both sit cleanly, and the Samsung Galaxy Watch8 - Wi-Fi · 40mm gives you more presence.
The Samsung Galaxy Watch7 - Wi-Fi · 40mm and Samsung Galaxy Watch8 - Wi-Fi · 40mm share a near-identical 40.4mm case, so wrist presence comes down to thickness, lug-to-lug and weight.
The Samsung Galaxy Watch8 - Wi-Fi · 40mm is the slimmer of the two (8.6mm vs 9.7mm), so it slides under a cuff more easily.
On the wrist the Samsung Galaxy Watch8 - Wi-Fi · 40mm feels lighter (30g vs 33.8g, case only).
Among the 509 40mm watches we hold thickness for, the Samsung Galaxy Watch7 - Wi-Fi · 40mm is thinner than 67%, so it wears flatter than its width suggests.
Among the 509 40mm watches we hold thickness for, the Samsung Galaxy Watch8 - Wi-Fi · 40mm is thinner than 83%, so it wears flatter than its width suggests.
Specification Comparison
| Spec | SamsungGalaxy Watch7 - Wi-Fi · 40mm | SamsungGalaxy Watch8 - Wi-Fi · 40mm |
|---|---|---|
| Case Width | 40.4mm | 40.4mm |
| Lug-to-Lug | 40.4mm | 42.7mm |
| Thickness | 9.7mm | 8.6mm |
| Weight | 33.8g | 30g |
| Shape | Circular | Circular |
| Water Resistance | 5 ATM | 5 ATM |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Screen size | 1.3 inches | 1.34 inches |
| Always-On Display | Yes | Yes |
| Battery life | 1.6 days | 2 days |
| Battery power | 300 mAh | 325 mAh |
| Has wireless charging | Yes | Yes |
| Has a removable battery | No | No |
| Has a solar power battery | No | No |
| Has a rechargeable battery | Yes | Yes |
| Has a battery level indicator | Yes | Yes |
| Released | 2024 | 2025 |
Hover a row to highlight that measurement in the schematics below.
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist. Built from the measurements, so it works for every watch whether or not it has a photo.
- Samsung Galaxy Watch7 - Wi-Fi · 40mm40.4mm · 9.7mm thick
- Samsung Galaxy Watch8 - Wi-Fi · 40mm40.4mm × 42.7mm · 8.6mm thick
Samsung Galaxy Watch7 - Wi-Fi · 40mm vs Samsung Galaxy Watch8 - Wi-Fi · 40mm on a wrist
Put Samsung Galaxy Watch7 - Wi-Fi · 40mm and Samsung Galaxy Watch8 - Wi-Fi · 40mm on the same arm, sized to your own wrist, and turn it. Side by side or stacked on one spot, whichever answers the question faster.
- Samsung Galaxy Watch7 - Wi-Fi · 40mm — 40.4mm case, standing 9.7mm off the wrist.
- Samsung Galaxy Watch8 - Wi-Fi · 40mm — 40.4mm case, 42.7mm lug-to-lug, standing 8.6mm off the wrist.
Whether that clears your wrist edges is the question worth answering, and it depends on your wrist rather than on the case diameter.
See them on a wrist in 3DCase shapes are generated from each watch's published measurements — case width, lug-to-lug and thickness — not from manufacturer 3D models, so the proportions are accurate while the dial is generic.
Battery life compared
Furthest apart in Smartwatch mode, where the Samsung Galaxy Watch8 - Wi-Fi · 40mm lasts 1.2× as long as the Samsung Galaxy Watch7 - Wi-Fi · 40mm (2 days against 38.4 hours).
Samsung Galaxy Watch7 - Wi-Fi · 40mmSamsung Galaxy Watch8 - Wi-Fi · 40mm
Smartwatch
1.6 days2 days
Full Specification Comparison
111 specs| Spec | Samsung Galaxy Watch7 - Wi-Fi · 40mm | Samsung Galaxy Watch8 - Wi-Fi · 40mm |
|---|---|---|
| Design | ||
| width | 40.4 | 40.4 |
| height | 40.4 | 42.7 |
| volume | 15.83 cm³ | 14.84 cm³ |
| weight | 33.8 g | 30 g |
| thickness | 9.7 | 8.6 |
| ATM rating | 5 ATM | 5 ATM |
| resolution | 432 x 432 px | 438 x 438 px |
| screen size | 1.3 inches | 1.34 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 327 ppi | 327 ppi |
| width of band | 20 mm | 20 mm |
| water resistance | Water resistant | 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 | Yes | Yes |
| maximum operating temperature | 35 °C | 35 °C |
| Ingress Protection (IP) rating | IP68 | IP68 |
| has branded damage-resistant glass | No | No |
| lowest potential operating temperature | 0 °C | 0 °C |
| Battery | ||
| battery life | 1.6 days | 2 days |
| battery power | 300 mAh | 325 mAh |
| has wireless charging | Yes | Yes |
| 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 | 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 | ||
| RAM | 2GB | 2GB |
| release date | 2024-07-10 | 2025-07-09 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| 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 | Yes |
| Locates your phone | Yes | Yes |
| has fall detection | Yes | Yes |
| has voice commands | Yes | Yes |
| Acquires GPS faster | Yes | 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 | Yes |
| has fast/slow heart rate notifications | Yes | Yes |
| Has a built-in camera remote control function | Yes | Yes |
| Connectivity | ||
| has NFC | Yes | Yes |
| Wi-Fi version | Wi-Fi 4 (802.11n) | Wi-Fi 4 (802.11n) |
| supports ANT+ | No | No |
| supports Wi-Fi | Yes | Yes |
| supports Galileo | Yes | Yes |
| Bluetooth version | 5.3 | 5.3 |
| has a cellular module | No | No |
| Is compatible with iOS | No | No |
| Is compatible with Android | Yes | Yes |
| Miscellaneous | ||
| Has passcode | Yes | Yes |
| Has auto pause | Yes | Yes |
| 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 | 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 | Yes |
| 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 exercise diary | 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 |
| Provides activity reports | 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 | 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 | Yes |
Wrist Fit
Samsung Galaxy Watch7 - Wi-Fi · 40mm
Sits best on wrists ~43–58mm wide (≈ 11.5–15.5cm circumference).
Samsung Galaxy Watch8 - Wi-Fi · 40mm
Sits best on wrists ~45–61mm wide (≈ 12.0–16.3cm circumference).
Frequently Asked Questions
Is the Samsung Galaxy Watch7 - Wi-Fi · 40mm bigger than the Samsung Galaxy Watch8 - Wi-Fi · 40mm?
Both have a 40.4mm case. Compare their thickness and lug-to-lug above to judge wrist presence.
Which fits a smaller wrist better, the Samsung Galaxy Watch7 - Wi-Fi · 40mm or the Samsung Galaxy Watch8 - Wi-Fi · 40mm?
The Samsung Galaxy Watch7 - Wi-Fi · 40mm suits wrists around 43–58mm wide, and the Samsung Galaxy Watch8 - Wi-Fi · 40mm around 45–61mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Samsung Galaxy Watch7 - Wi-Fi · 40mm and Samsung Galaxy Watch8 - Wi-Fi · 40mm 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.