Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →The Samsung Galaxy Watch8 40mm is the compact standard Watch8. It has the same 3nm five-core processor class, 2GB of RAM, 32GB of internal storage, sapphire-crystal Super AMOLED display, dual-frequency GPS and Samsung Health platform as the larger model. Its main compromise is the smaller 325mAh battery, compared with 435mAh in the 44mm version.
This article covers the U.S. model unless stated otherwise. Prices, model numbers, colors, LTE support and health features can vary by country.
Samsung Galaxy Watch8 40mm specifications at a glance
| Specification | Galaxy Watch8 40mm |
|---|---|
| Case | Armor Aluminum |
| Dimensions | 42.7 × 40.4 × 8.6mm |
| Weight | 30g without band |
| Colors | Graphite and Silver in the U.S. |
| Display | 34.0mm Super AMOLED, sapphire crystal |
| Maximum brightness | Up to 3,000 nits |
| Processor | Five-core 3nm wearable processor |
| Memory | 2GB RAM |
| Storage | 32GB internal storage |
| Software | Wear OS powered by Samsung |
| Battery | 325mAh |
| Claimed battery life | Up to 30 hours with Always-On Display enabled |
| GPS | Dual-frequency L1+L5 GPS |
| Wireless connectivity | Bluetooth 5.3, 2.4GHz/5GHz Wi-Fi and NFC |
| Cellular option | LTE, subject to carrier support and a compatible plan |
| Water and dust protection | 5ATM and IP68 |
| Durability testing | MIL-STD-810H |
| U.S. Bluetooth MSRP | $349.99 |
| U.S. LTE MSRP | $399.99 |
Specifications are based on Samsung’s U.S. product information and regional technical listings: Samsung Galaxy Watch8, regional technical specifications, and Samsung’s watch comparison table.
Price, colors and model numbers
Samsung’s June 2026 U.S. MSRP is $349.99 for the Bluetooth/Wi-Fi model and $399.99 for LTE. These are list prices, not guaranteed current sale prices. The $50 LTE premium also excludes any recurring smartwatch cellular charge.
Free tools Windows power users keep installed
One-click scans. No signup required.
#1 Best Overall
![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.
- Bluetooth/Wi-Fi, Graphite: SM-L320NDAAXAA
- Bluetooth/Wi-Fi, Silver: SM-L320NZSAXAA
- LTE, Graphite: SM-L325UDAAXAA
- LTE, Silver: SM-L325UZSAXAA
Model numbers, colors and available cellular bands can differ outside the United States. Check the local Samsung listing before importing a watch.
Design, dimensions and display
The “40mm” name describes Samsung’s size category; the actual case measures approximately 42.7 × 40.4 × 8.6mm. It weighs 30g without the band. The case uses Armor Aluminum, Samsung’s cushion-style design and a Dynamic Lug System.
The 40mm version has a 34.0mm, approximately 1.34-inch, circular Super AMOLED display. Sapphire crystal provides improved scratch resistance over ordinary watch glass, but it is not unbreakable.
Samsung advertises brightness of up to 3,000 nits. That is a maximum specification rather than a promise that the panel will remain at that level in every mode or situation. It should help with outdoor visibility, but reflections, direct sun, watch settings and automatic brightness behavior still matter.
The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Rank #2
![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.
Performance, storage and software
The Watch8 uses Samsung’s five-core 3nm wearable processor class, with 2GB of RAM and 32GB of internal storage. The processor name should not be confused with a separately verified chip-brand designation; Samsung’s official product material identifies the processor by its manufacturing process and core count.
The 32GB figure is total internal storage. Operating-system files, preinstalled apps and reserved system space reduce the amount available for downloaded apps, music and other content.
The watch runs Wear OS powered by Samsung. Software features and labels can change through updates, and individual functions may require Samsung Health, Samsung Health Monitor, a Samsung account, Google services or a particular phone configuration.
Battery life and charging
The 40mm Watch8 has a 325mAh battery. Samsung rates it for up to 30 hours with Always-On Display enabled. That is a manufacturer estimate, not a guarantee of 30 hours in every usage pattern.
Rank #3
![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.
Battery life can be materially shorter with LTE away from the phone, continuous GPS, frequent screen activation, sleep tracking, continuous heart-rate or stress monitoring, blood-oxygen or temperature measurements, music playback, calls, frequent notifications or weak cellular coverage.
The watch charges wirelessly using the included Wireless Charger. Do not assume that every generic Qi charger will provide full or reliable compatibility.
Health and fitness features
The Watch8 includes an optical heart-rate sensor, electrical heart sensor for ECG, bioelectrical impedance analysis, blood-oxygen sensing, temperature sensing, accelerometer, gyroscope, barometer/altimeter, geomagnetic sensor and ambient-light sensor.
Supported Samsung Health functions include:
- ECG recording and irregular-heart-rhythm notifications
- Blood-pressure readings when supported and calibrated
- Blood-oxygen and heart-rate monitoring
- Body composition estimates using BIA
- Sleep tracking, sleep coaching and sleep-apnea risk detection
- Cycle tracking and temperature-based insights
- Energy Score and other wellness trends
- Workout detection, running tools and personalized heart-rate zones
- Antioxidant Index and related Samsung Health features
These are monitoring, screening and wellness tools—not substitutes for clinical diagnosis. The watch does not diagnose sleep apnea or heart disease, and its blood-pressure function is not a replacement for a validated cuff. Follow Samsung’s setup, calibration and medical-use warnings.
Rank #4
- 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.
Availability varies by country, phone, software, Samsung account, app version and regulatory approval. Samsung’s health-feature availability document, updated July 13, 2026, lists different supported countries for ECG, blood pressure, irregular-heart-rhythm notifications and sleep-apnea features.
GPS and workout tracking
The Watch8 supports dual-frequency L1+L5 GPS and additional satellite-positioning systems listed by Samsung. Dual-frequency positioning is designed to improve tracking in difficult environments such as dense cities and areas with signal reflections; it cannot guarantee perfect route accuracy.
Buildings, trees, weather, satellite geometry and the difference between watch-recorded and phone-assisted positioning can affect a route. LTE and GPS are separate capabilities: an LTE model does not automatically make GPS more accurate.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Bluetooth/Wi-Fi versus LTE
| Model | Best for | Important limitation |
|---|---|---|
| Bluetooth/Wi-Fi | Users who usually carry a phone and want the lower price | Not intended for dependable phone-free cellular calls, messages or streaming |
| LTE | Runners, travelers and users who want calls, messages and data without the phone nearby | Requires carrier support, activation and a compatible paid plan; cellular use can reduce battery life |
LTE activation can fail when the carrier does not support the watch, number sharing is incomplete, the watch and phone are incompatible regional models, or coverage is weak. Confirm carrier compatibility before buying.
Best Value
- International Model - No Warranty. Bluetooth Version: Wi-Fi + GPS Only. Not Compatible with Iphone/IOS. Supports Samsung Pay. (Important: Country selection may not be available during setup. Select Any, as Country will updated later after Connecting to WIFI in Settings.)
- For Non-Samsung Devices: Requires Android 12.0 or higher, 1.5GB RAM or higher (Certain models and tablets are not supported). The included Charger is a generic accessory and is not a Samsung-branded charger. For Samsung Devices: Requires Android 12.0 or Higher and 1.5GB RAM or higher. (Tablets not Supported).
- 1.34" Super AMOLED Display (438x438px), Sapphire Crystal Protection, 3000 nits Peak Brightness, IP68 Water Resistant (up to 50m), MIL-STD-810H Compliant. Track your health with advanced sensors: ECG, Blood Pressure Monitor, SpO2, Heart Rate, Sleep Tracker, Temperature (skin), and Antioxidant Index
- Features Advanced Sleep Coaching, Galaxy AI for intelligent health summaries, Energy Score insights, and real-time workout coaching.
- 32GB, 2GB RAM, Exynos W1000 (3nm), Penta-core, Mali-G68 GPU, Android Wear OS 6, One UI Watch 8, 325mAh Battery, Bluetooth 5.3
Compatibility
Samsung’s U.S. information specifies compatibility with Samsung Galaxy smartphones running Android 12 or later. The watch is designed for Android pairing through Galaxy Wearable and Samsung Health, but basic pairing with an Android phone does not make every health feature equivalent to the Samsung Galaxy experience.
ECG, blood pressure, irregular-heart-rhythm notifications and other Samsung Health Monitor features may require a compatible Samsung Galaxy phone, Samsung Health Monitor, a Samsung account, calibration and regional approval. The Galaxy Watch8 does not support normal pairing with an iPhone.
Galaxy Watch8 40mm versus 44mm
| Specification | 40mm | 44mm |
|---|---|---|
| Battery | 325mAh | 435mAh |
| Weight | 30g | 33.8g |
| Display | 34.0mm | Larger display |
| U.S. Bluetooth MSRP | $349.99 | $379.99 |
| U.S. LTE MSRP | $399.99 | $429.99 |
The 44mm model adds only 3.8g in Samsung’s listed weight while providing substantially more battery capacity and more screen area. Choose the 40mm for a smaller, lighter case and the 44mm when battery headroom, large text or long GPS/LTE sessions matter more.
Durability and water resistance
The Watch8 carries 5ATM water resistance, IP68 dust-and-water resistance and MIL-STD-810H testing. These ratings are not the same as being waterproof or indestructible. Swimming, salt water, hot tubs, detergents, impacts, aging seals and improper use can reduce protection. MIL-STD-810H describes testing against specified conditions, not a guarantee against every type of damage.
Free tools Windows power users keep installed
One-click scans. No signup required.
Which Galaxy Watch8 40mm should you buy?
- Buy the 40mm Bluetooth model if your phone is normally nearby, you want the lowest price and comfort matters most.
- Buy the 40mm LTE model if you regularly leave your phone behind and your carrier supports smartwatch service.
- Choose the 44mm model instead if you do long GPS workouts, expect frequent LTE use, prefer a larger display or want more battery capacity.
- Consider a discounted Watch7 40mm if price matters more than the Watch8’s newer design, 3nm processor class and higher advertised brightness.
- Consider Watch8 Classic or Watch Ultra only if you specifically want a more traditional or rugged-oriented design; neither is the compact 40mm choice.
Verdict
The Galaxy Watch8 40mm is the better Watch8 for smaller wrists, lower weight and compact comfort. It retains the family’s core display, processor, health and GPS capabilities, but its 325mAh battery leaves less headroom than the 44mm model. Buy it for its size—not because it offers the best endurance. For frequent LTE, GPS or long workout use, the 44mm version is the safer choice.
Quick Recap
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.
