Samsung Galaxy Watch Ultra vs Samsung Galaxy Watch8 - LTE · 44mmSize, Specs & Wrist Fit Compared
The Samsung Galaxy Watch Ultra is 3.7mm wider, 1.4mm longer, 3.5mm thicker and 26.5g heavier than the Samsung Galaxy Watch8 - LTE · 44mm. Both are circular.
Measured against the Samsung Galaxy Watch Ultra.
- Case width
- 47.4mmbaseGalaxy Watch Ultra43.7mm−3.7mmGalaxy Watch8 - LTE · 44mm
- Lug-to-lug
- 47.4mmbaseGalaxy Watch Ultra46mm−1.4mmGalaxy Watch8 - LTE · 44mm
- Thickness
- 12.1mmbaseGalaxy Watch Ultra8.6mm−3.5mmGalaxy Watch8 - LTE · 44mm
- Weight
- 60.5gbaseGalaxy Watch Ultra34g−26.5gGalaxy Watch8 - LTE · 44mm
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Samsung
Galaxy Watch Ultra
Samsung
Galaxy Watch8 - LTE · 44mm
Which one fits you
On wrists narrower than about 50mm, the Samsung Galaxy Watch8 - LTE · 44mm is the safer pick — it stays proportionate down to roughly 48mm, where the Samsung Galaxy Watch Ultra starts to hang over the edge. Above 50mm both sit cleanly, and the Samsung Galaxy Watch Ultra gives you more presence.
The Samsung Galaxy Watch Ultra wears larger than the Samsung Galaxy Watch8 - LTE · 44mm (47.4mm vs 43.7mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Samsung Galaxy Watch8 - LTE · 44mm is the slimmer of the two (8.6mm vs 12.1mm), so it slides under a cuff more easily.
On the wrist the Samsung Galaxy Watch8 - LTE · 44mm feels lighter (34g vs 60.5g, case only).
Among the 83 47mm watches we hold thickness for, the Samsung Galaxy Watch Ultra is thinner than 87%, so it wears flatter than its width suggests.
Among the 303 44mm watches we hold thickness for, the Samsung Galaxy Watch8 - LTE · 44mm is thinner than 99%, so it wears flatter than its width suggests.
Specification Comparison
| Spec | SamsungGalaxy Watch Ultra | SamsungGalaxy Watch8 - LTE · 44mm |
|---|---|---|
| Case Width | 47.4mm | 43.7mm |
| Lug-to-Lug | 47.4mm | 46mm |
| Thickness | 12.1mm | 8.6mm |
| Weight | 60.5g | 34g |
| Shape | Circular | Circular |
| Water Resistance | 10 ATM | 5 ATM |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Screen size | 1.5 inches | 1.47 inches |
| Always-On Display | Yes | Yes |
| Battery life | 4 days | 2 days |
| Battery power | 590 mAh | 435 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 Watch Ultra47.4mm · 12.1mm thick
- Samsung Galaxy Watch8 - LTE · 44mm43.7mm × 46mm · 8.6mm thick
Samsung Galaxy Watch Ultra vs Samsung Galaxy Watch8 - LTE · 44mm on a wrist
Put Samsung Galaxy Watch Ultra and Samsung Galaxy Watch8 - LTE · 44mm 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 Watch Ultra — 47.4mm case, standing 12.1mm off the wrist.
- Samsung Galaxy Watch8 - LTE · 44mm — 43.7mm case, 46mm 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 Watch Ultra lasts 2.0× as long as the Samsung Galaxy Watch8 - LTE · 44mm (4 days against 2 days).
Samsung Galaxy Watch UltraSamsung Galaxy Watch8 - LTE · 44mm
Battery Saver
100 hours—Smartwatch
4 days2 daysTraining
48 hours—
Full Specification Comparison
118 specs| Spec | Samsung Galaxy Watch Ultra | Samsung Galaxy Watch8 - LTE · 44mm |
|---|---|---|
| Design | ||
| width | 47.4 | 43.7 |
| height | 47.4 | 46 |
| volume | 27.19 cm³ | 17.29 cm³ |
| weight | 60.5 g | 34 g |
| thickness | 12.1 | 8.6 |
| ATM rating | 10 ATM | 5 ATM |
| resolution | 480 x 480 px | 480 x 480 px |
| screen size | 1.5 inches | 1.47 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 327 ppi | 327 ppi |
| maximum altitude | 29527 feet | — |
| 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 | 100 m | 50 m |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | Yes | Yes |
| maximum operating temperature | 55 °C | 35 °C |
| Ingress Protection (IP) rating | IP68 | IP68 |
| has branded damage-resistant glass | No | No |
| lowest potential operating temperature | -20 °C | 0 °C |
| width of band | — | 20 mm |
| Battery | ||
| battery life | 4 days | 2 days |
| battery power | 590 mAh | 435 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 |
| battery life in training mode | 48 hours | — |
| battery life in power save mode | 100 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 | ||
| 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 a front camera | No | — |
| 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 |
| SIM cards | 1 eSIM | 1 eSIM |
| Wi-Fi version | Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac) | Wi-Fi 4 (802.11n) |
| supports ANT+ | No | No |
| supports Wi-Fi | Yes | Yes |
| supports Galileo | Yes | Yes |
| Bluetooth version | 5.4 | 5.3 |
| has a cellular module | Yes | Yes |
| 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 |
| Predicts ovulation | 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 |
| Displays fertile window notifications | Yes | — |
| Counts how many calories you've burned | Yes | Yes |
| Activity tracking | ||
| Measures pace | Yes | Yes |
| Tracks distance | Yes | Yes |
| Tracks elevation | 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 |
| Designed for golf | — | No |
Wrist Fit
Samsung Galaxy Watch Ultra
Sits best on wrists ~50–68mm wide (≈ 13.4–18.2cm circumference).
Samsung Galaxy Watch8 - LTE · 44mm
Sits best on wrists ~48–66mm wide (≈ 12.8–17.6cm circumference).
Frequently Asked Questions
Is the Samsung Galaxy Watch Ultra bigger than the Samsung Galaxy Watch8 - LTE · 44mm?
The Samsung Galaxy Watch Ultra is bigger — 47.4mm vs 43.7mm case width.
Which fits a smaller wrist better, the Samsung Galaxy Watch Ultra or the Samsung Galaxy Watch8 - LTE · 44mm?
The Samsung Galaxy Watch Ultra suits wrists around 50–68mm wide, and the Samsung Galaxy Watch8 - LTE · 44mm around 48–66mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Samsung Galaxy Watch Ultra and Samsung Galaxy Watch8 - LTE · 44mm 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.