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For most Android users, the Samsung Galaxy Watch8 is the better everyday pick: it comes in smaller, lighter sizes. Choose the Galaxy Watch Ultra (2025) if you want a larger battery, more storage, a 47 mm case, or a higher stated water-resistance rating. This comparison covers the 2025-generation models; Samsung’s current materials also include newer Watch9 and Ultra2 models.
How the Galaxy Watch8 and Watch Ultra (2025) differ
The main trade-off is size and weight versus battery capacity and ruggedness ratings. The Watch8 comes in 40 mm and 44 mm sizes; the Ultra is a 47 mm model. Samsung’s specifications are useful for comparing hardware, but they do not establish how either watch feels on a particular wrist or how long it will last in everyday use.
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| Specification | Galaxy Watch8 | Galaxy Watch Ultra (2025) |
|---|---|---|
| Case size and weight | 40 mm: 30 g; 44 mm: 33.8 g | 47 mm: 60.5 g |
| Battery capacity | 325 mAh (40 mm); 435 mAh (44 mm) | 590 mAh |
| Samsung’s stated battery estimate with AOD on | Up to 30 hours | Up to 60 hours |
| Water and durability ratings | 5 ATM, IP68, MIL-STD-810H | 10 ATM, IP68, MIL-STD-810H |
| Internal storage | 32 GB | 64 GB |
| Operating system | Wear OS powered by Samsung; the Watch8 launch announcement specifies Wear OS 6 | Wear OS powered by Samsung; confirm the exact model and software version in the regional listing |
Specifications are from Samsung’s US comparison page, Samsung’s July 9, 2025 launch announcement, and Samsung’s US Ultra product page. The battery figures are manufacturer estimates, not results from a matched independent test; actual runtime depends on use and settings. ATM, IP68, and MIL-STD-810H are listed ratings, not a guarantee for every activity or condition.
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Choose the Galaxy Watch8 for a lighter, smaller daily watch
At 30 g for the 40 mm model and 33.8 g for the 44 mm model, the Watch8 is substantially lighter on paper than the 60.5 g Ultra. The two Watch8 sizes also give you a choice of case size. If a large watch feels cumbersome, or you want a less bulky option for daily wear, the Watch8 is the more natural starting point. Comfort is personal, and these listed weights cannot tell you how a watch will fit your wrist.
#1 Best Overall
![Samsung Galaxy Watch 8 40mm Bluetooth Smartwatch, Cushion Design, Quick Button, Sleep Coaching, Now Bar, Running Coach, Energy Score, Graphite [US Version, Amazon Exclusive 2Yr Warranty]](https://m.media-amazon.com/images/I/41pVUmtVzHL._SL160_.jpg)
- WHY GALAXY WATCH8: Advanced health and sleep tracking features.* A lighter, more snug design for all day comfort.* Improved user interface.* Personal AI assistant for hands free help.⁴* 2-Year Warranty.
- SLEEP SMARTER. LIVE BETTER: Energize your days with a great night’s rest using Advanced Sleep Coaching¹ - improved with even more ways to keep your nights on track. Plus, Bedtime Guidance² helps you find your optimal bedtime.
- YOUR RUN, YOUR COACH: Step up your running routine with a Running Coach³ that analyzes your performance and gives you real-time feedback. Training for an event? Try specific programs built for 5Ks, marathons and more.
- NEW DESIGN. LIGHTWEIGHT FEEL: Maximize your days with a minimalist design. The sleek, thinner-than-ever silhouette makes Galaxy Watch8 look as good as it functions. With a snug fit and sporty style, it gives you readings without getting in your way.
- A PERSONAL ASSISTANT, RIGHT ON YOUR WRIST: Your Watch just became your personal assistant.⁴ Stay one step ahead of your day with a watch that helps you navigate your tasks and to-do lists.
Choose the Galaxy Watch Ultra (2025) for capacity and tougher stated ratings
The Ultra’s 590 mAh battery has greater capacity than either Watch8 battery, and Samsung lists up to 60 hours with the always-on display (AOD) enabled, compared with up to 30 hours for the Watch8. It also has 64 GB of listed storage, versus 32 GB for the Watch8. Those are meaningful advantages if you value more battery capacity or internal space, but they do not establish a particular real-world runtime or how much storage you will need.
The Ultra is rated 10 ATM, while the Watch8 is rated 5 ATM. Both list IP68 and MIL-STD-810H. The higher ATM rating is a specification difference; do not treat it as an assurance that the watch is suitable for every water activity.
Rank #2
![Samsung Galaxy Watch 8 44mm Bluetooth Smartwatch, Cushion Design, Rotating Bezel, Quick Button, Sleep Coaching, Now Bar, Running Coach, Energy Score,Graphite [US Version,Amazon Exclusive 2Yr Warranty]](https://m.media-amazon.com/images/I/41tViNtwyEL._SL160_.jpg)
- WHY GALAXY WATCH8: Advanced health and sleep tracking features.* A lighter, more snug design for all day comfort.* Improved user interface.* Personal AI assistant for hands free help.⁴* 2-Year Warranty.
- SLEEP SMARTER. LIVE BETTER: Energize your days with a great night’s rest using Advanced Sleep Coaching¹ - improved with even more ways to keep your nights on track. Plus, Bedtime Guidance² helps you find your optimal bedtime.
- YOUR RUN, YOUR COACH: Step up your running routine with a Running Coach³ that analyzes your performance and gives you real-time feedback. Training for an event? Try specific programs built for 5Ks, marathons and more.
- NEW DESIGN. LIGHTWEIGHT FEEL: Maximize your days with a minimalist design. The sleek, thinner-than-ever silhouette makes Galaxy Watch8 look as good as it functions. With a snug fit and sporty style, it gives you readings without getting in your way.
- A PERSONAL ASSISTANT, RIGHT ON YOUR WRIST: Your Watch just became your personal assistant.⁴ Stay one step ahead of your day with a watch that helps you navigate your tasks and to-do lists.
Android compatibility and features to verify
Samsung’s July 9, 2025 announcement says the Watch8 works with phones running Android 12 or later that have more than 1.5 GB of memory. Samsung also cautions that availability and features can vary by market, model, and paired smartphone. That means the minimum compatibility statement does not guarantee that every health feature works on every Android phone or in every country. For the Ultra, check the exact model and regional product listing for its compatibility requirements and the features you expect to use.
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- Pick the Watch8 if lower listed weight, smaller case options, and everyday wear are your priorities.
- Pick the Watch Ultra (2025) if you prefer its 47 mm case and value the larger stated battery capacity, 64 GB storage, or 10 ATM rating enough to accept its higher listed weight.
- Check newer generations, too if you are shopping now. Samsung’s support comparison page refers to Watch9 and Ultra2 alongside Watch8 and Ultra, so this is a comparison of 2025-generation choices, not necessarily the newest models available in October 2026.
Prices are not included because the available Samsung price sheets are from 2025 and do not establish current October 2026 retail offers. Compare the same Watch8 size and connectivity type with the exact Ultra configuration sold in your market.
Quick Recap
Best Value
![Samsung Galaxy Watch 8 (2025) 40mm LTE Smartwatch, Cushion Design, Fitness Tracker, Sleep Coaching, Running Coach, Energy Score, Heart Rate Tracking, Silver [US Version] (Renewed)](https://m.media-amazon.com/images/I/31cmvlZ2HTL._SL160_.jpg)
- WHY GALAXY WATCH8: Advanced health and sleep tracking features.* A lighter, more snug design for all day comfort.* Improved user interface.* Personal AI assistant for hands free help.⁴* 90 days Warranty.
- SLEEP SMARTER. LIVE BETTER: Energize your days with a great night’s rest using Advanced Sleep Coaching¹ - improved with even more ways to keep your nights on track. Plus, Bedtime Guidance² helps you find your optimal bedtime.
- YOUR RUN, YOUR COACH: Step up your running routine with a Running Coach³ that analyzes your performance and gives you real-time feedback. Training for an event? Try specific programs built for 5Ks, marathons and more.
- NEW DESIGN. LIGHTWEIGHT FEEL: Maximize your days with a minimalist design. The sleek, thinner-than-ever silhouette makes Galaxy Watch8 look as good as it functions. With a snug fit and sporty style, it gives you readings without getting in your way.
- A PERSONAL ASSISTANT, RIGHT ON YOUR WRIST: Your Watch just became your personal assistant.⁴ Stay one step ahead of your day with a watch that helps you navigate your tasks and to-do lists.
Rank #4
![Samsung Galaxy Watch 8 Classic 46mm Bluetooth Smartwatch, Cushion Design, Rotating Bezel, Quick Button, Sleep Coaching, Running Coach, Energy Score, Black [US Version, Amazon Exclusive 2Yr Warranty]](https://m.media-amazon.com/images/I/51Vc6CWcxAL._SL160_.jpg)
- WHY GALAXY WATCH8 CLASSIC: Timeless design.* New lug system for easy band detachment & replacement.* Advanced health & sleep tracking features for total body wellness.* Improved user interface.* Personal AI assistant for hands free help.¹* 2-Yr Warranty
- BUILT TO PERFORM. DESIGNED TO IMPRESS: Show off your style with an iconic design that blends tradition with cutting-edge innovation.¹ A brighter screen makes everything easy to see, and a rotating bezel gives you access to your favorite apps
- YOUR EVERY COMMAND, RIGHT ON YOUR WRIST: Get a little extra help with day-to-day tasks. Galaxy Watch 8 Classic features a personal AI assistant¹ that helps you get things done hands-free. Simply speak the command and your Watch makes it happen
- UNLOCK THE SECRETS TO BETTER SLEEP: When you get good sleep, it feels like anything is possible. Start each day with more energy and better focus using Advanced Sleep Coaching² - improved with even more ways to help you sleep smarter
- QUICK UPDATES, AT A GLANCE: Get updates, select apps and more with Now Bar³,⁴ and an improved user experience. Now Bar conveniently puts the info you use the most - like weather, news and more - right on your main Watch screen
Rank #3
![Samsung Galaxy Watch 8 40mm Bluetooth Smartwatch, Cushion Design, Quick Button, Sleep Coaching, Now Bar, Running Coach, Energy Score, Silver [US Version, Amazon Exclusive 2Yr Warranty]](https://m.media-amazon.com/images/I/31LaWf6wVqL._SL160_.jpg)
- WHY GALAXY WATCH8: Advanced health and sleep tracking features.* A lighter, more snug design for all day comfort.* Improved user interface.* Personal AI assistant for hands free help.⁴* 2-Year Warranty.
- SLEEP SMARTER. LIVE BETTER: Energize your days with a great night’s rest using Advanced Sleep Coaching¹ - improved with even more ways to keep your nights on track. Plus, Bedtime Guidance² helps you find your optimal bedtime.
- YOUR RUN, YOUR COACH: Step up your running routine with a Running Coach³ that analyzes your performance and gives you real-time feedback. Training for an event? Try specific programs built for 5Ks, marathons and more.
- NEW DESIGN. LIGHTWEIGHT FEEL: Maximize your days with a minimalist design. The sleek, thinner-than-ever silhouette makes Galaxy Watch8 look as good as it functions. With a snug fit and sporty style, it gives you readings without getting in your way.
- A PERSONAL ASSISTANT, RIGHT ON YOUR WRIST: Your Watch just became your personal assistant.⁴ Stay one step ahead of your day with a watch that helps you navigate your tasks and to-do lists.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
