Samsung

Samsung Galaxy Watch 5 SM-R900 Bluetooth Fitness Smartwatch

4.4 (900 reviews)

A health-focused smartwatch with body composition tracking, sapphire crystal durability, and seamless Galaxy ecosystem integration.

$94.44*
In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jun 27, 2026.Price and availability are subject to change.

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Overview

The Samsung Galaxy Watch 5 (SM-R900) is a Bluetooth fitness smartwatch that consolidates health monitoring, fitness tracking, and smartphone notifications into a compact wearable running Wear OS. What sets it apart from generic fitness bands is the depth of its health sensors: the curved BioActive sensor measures heart rate, blood oxygen, and — uniquely at this price point — body composition via bioelectrical impedance analysis. That means you can get body fat percentage, skeletal muscle mass, body water, BMI, and basal metabolic rate readings directly from your wrist. Combined with advanced sleep coaching that analyzes your sleep stages and builds personalized improvement plans, it functions as a comprehensive daily health dashboard. The enhanced GPS with voice navigation makes it genuinely useful for outdoor runs and hikes without needing your phone.

In daily use, the Galaxy Watch 5 feels like a refined tool rather than a flashy gadget. The sapphire crystal face handles the inevitable desk bumps, door frames, and bag scratches that destroy lesser smartwatch displays — it's a meaningful durability upgrade. At 1.16 ounces, it's light enough to sleep in comfortably, which you'll need to do if you want the sleep tracking data. The Wear OS platform gives you access to Google Maps, Google Assistant, and a growing app library, while Samsung's own Galaxy integration adds phone camera control, SmartThings smart home management, and seamless media handoff between Galaxy devices. The 40mm size with its compact 1.75 x 1.7 x 0.39-inch dimensions suits smaller wrists well, though buyers with larger wrists or preferences for bigger displays should consider the 44mm variant. It's best suited for Android users — particularly Samsung phone owners — who want a single device that handles health monitoring, workout tracking, and smart notifications without the bulk of a dedicated sports watch.

Key Features

ADVANCED SLEEP COACHING: Manage your overall sleep quality with an advanced sleep tracker that detects and analyzes sleep stages while you rest; Plus, Advanced Sleep Coaching helps you develop better sleep habits by analyzing your sleep patterns.Supported Application:Fitness Tracker,Blood Pressure Monitor,Multisport Tracker,Time Display,GPS. Connectivity technology:Bluetooth. Wireless comm standard:Bluetooth,802_11_AGNAC

BODY COMPOSITION ANALYSIS (BIA): Galaxy Watch5 provides body composition data right on your wrist; On your own schedule, you can now get readings on body fat, skeletal muscle, body water, basal metabolic rate and Body Mass Index (BMI)

IMPROVED SENSOR ACCURACY: Stay up to date on your wellness; Get an accurate heart rate thanks to an improved, curved Samsung BioActive Sensor that gets closer to your skin

AUTO WORKOUT TRACKING: Make the most of every adventure with Auto Workout Tracking - from running to rowing to swimming - automatically in just minutes, and manually tracking more than 90 exercises, including complex activities like HIIT

IMPROVED BATTERY & GALAXY CONNECTED EXPERIENCE: Meet the watch that goes as long as you do; Galaxy Watch5’s improved battery keeps up with your busiest day Do more with synced Galaxy devices that work in perfect harmony

SAPPHIRE CRYSTAL GLASS: Galaxy Watch5 can stand the test of the hardest days; Its sapphire crystal glass face is 1.6x stronger, resisting the problems that come with life’s daily routines

ENHANCED GPS: Get out there; Explore the great outdoors; Now you can wander all you want and still know where you are; Galaxy Watch5 features enhanced GPS with voice navigation right on your wrist

waterproof

Water resistance depth: 50.0 meters

grey

Specifications

Brand
Samsung
Model
SM-R900
Display Size
1.19 inches (40mm case)
Operating System
Wear OS
Memory
1.5GB RAM
Storage
16GB
Connectivity
Bluetooth, Wi-Fi (802.11 a/b/g/n/ac)
GPS
Enhanced GPS with voice navigation
Water Resistance
50 meters
Display Glass
Sapphire Crystal (1.6x stronger)
Sensors
BioActive sensor (heart rate, BIA, SpO2)
Special Features
Body Composition Analysis, Advanced Sleep Coaching, Auto Workout Tracking
Dimensions
1.75 x 1.7 x 0.39 inches
Weight
1.16 ounces
Color
Gray

Pros & Cons

👍 Pros

  • BioActive sensor with improved curved design sits closer to skin, delivering more consistent heart rate and SpO2 readings than the previous generation
  • Body composition analysis provides five health metrics directly from the wrist without needing a separate smart scale
  • Sapphire crystal glass is 1.6x harder than the Galaxy Watch 4's display, dramatically reducing scratch risk from daily wear
  • Auto workout detection recognizes and logs exercises within minutes, plus supports manual tracking of over 90 activity types
  • 50-meter water resistance rating means it handles swimming, showering, and rain without concern

👎 Cons

  • Battery requires daily charging for most users, especially with always-on display or extended GPS tracking enabled
  • Android-only compatibility — no iPhone support limits this to Samsung and Android phone owners
  • 16GB internal storage fills quickly if you load offline Spotify playlists or multiple watch faces
  • Sleep tracking requires wearing the watch overnight, which competes with the limited battery window for charging
  • Galaxy ecosystem features like camera control and SmartThings integration only work fully with Samsung phones, not all Android devices

Frequently Asked Questions

It's designed for Android phones running Android 8.0 or later with at least 1.5GB of RAM. It pairs through the Galaxy Wearable app. It does not support iPhone — Apple's ecosystem restrictions prevent full Wear OS functionality on iOS. If you're an iPhone user, this isn't the right watch for you.
The BIA sensor measures body fat percentage, skeletal muscle mass, body water, BMI, and basal metabolic rate using electrical impedance through two fingers on the watch. It's useful for tracking trends over time rather than as a clinical-grade measurement. Consistency matters more than absolute accuracy — take readings at the same time of day, same hydration level, for the most meaningful trend data.
With always-on display off, moderate notifications, a 30-minute tracked workout, and sleep tracking, most users get about 36–40 hours per charge. With always-on display enabled and heavy GPS use, that drops closer to 24 hours. It's a daily charger for most people — reliable for a full day and night, but don't expect multi-day battery life.
The 40mm case has a 1.19-inch display (the listing mentions 1.4 inches, which applies to the 44mm variant). For most wrists under 7 inches in circumference, the 40mm fits proportionally well and text is readable, though people who prefer larger watch faces or have difficulty reading small screens may want the 44mm. The sapphire crystal display is bright and sharp at either size.
The main upgrades are the sapphire crystal glass (1.6x more scratch-resistant than the Watch 4's Gorilla Glass DX+), a larger battery (13% bigger in the 40mm, 10% bigger in the 44mm), an improved BioActive sensor with better skin contact for more accurate heart rate readings, and improved GPS accuracy. The body composition and sleep tracking features carry over but benefit from the better sensor hardware.