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Catalogue in 5 languagesMaker-verified specifications
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HomeSmartwatchesSamsungGalaxy Watch9 40mm
Global SmartwatchesGalaxy Watch9 40mm
Samsung

Galaxy Watch9 40mm

40 mm • up to 30 hours • Yes • 5 ATM

40 mmCase Size
up to 30 hoursBattery Life
YesECG App
5 ATMWater Resistance
KACBU

Should I buy it?

Galaxy Watch9 40mm
CONSIDER
    Great choice if these matter:
    • Health Tracking
    • Android phone owners
    • Daily Use
    Watch out for:
    • Samsung names the chip only in the page's copy; there is no processor row in the spec sheet
    • By Samsung's own footnotes, ECG and irregular rhythm notifications are not enabled in every country
    Regret riskLOWlimited data
    Main risks
    • Samsung names the chip only in the page's copy; there is no processor row in the spec sheet
    • By Samsung's own footnotes, ECG and irregular rhythm notifications are not enabled in every country
    • The 30 hours the maker states were measured with the always-on display running; other use changes the figure
    • Wireless networking stops at Wi-Fi 4
    The risk level is computed from the release date and verified weaknesses. The confidence score appears only once enough owner reports exist.
    Alternatives
    Apple Watch Series 11 42mm
    Apple Watch SE 3 44mm
    This box relies only on verified specs, the release date and editorial assessment; owner reports join them as they come in. We do not predict prices.
    HealthDisplayLocationBatteryDurabilityLaunchSpecificationsAlternatives
    Health

    What does it measure on the health side?

    The maker's own official specifications. A sensor being present does not mean the feature is enabled in every country.

    HEALTH

    A sensor is one thing; a feature is another.

    Yes

    Yes — Heart Rate Sensor · Yes — SpO2 Sensor · Yes — ECG Sensor · Yes — ECG App · Yes — Sleep Tracking · Yes — Fall Detection

    YesYesYesYesYesYes
    YesHeart Rate Sensor
    YesSpO2 Sensor
    YesECG Sensor
    YesECG App
    YesSleep Tracking
    YesFall Detection
    Display

    What does the display offer?

    Manufacturer's official technical values.

    DISPLAY

    The display is where every interaction on the wrist happens.

    1.3 "

    1.3" — Screen Size · Super AMOLED — Panel · 438x438 — Resolution · 3000 nit — Peak Brightness · Yes — Always-On Display

    1.3"Super AMOLED438x4383000 nitYes
    1.3"Screen Size
    Super AMOLEDPanel
    438x438Resolution
    3000 nitPeak Brightness
    YesAlways-On Display
    Location

    What is there on the positioning side?

    Manufacturer's official technical values.

    LOCATION

    Having a GNSS receiver does not mean it is dual-band.

    Yes

    Yes — GNSS Receiver · Yes — Dual-Band GNSS · GPS, Glonass, Beidou, Galileo, QZSS — GNSS Systems

    YesYesGPS, Glonass, Beidou, Galileo, QZSS
    YesGNSS Receiver
    YesDual-Band GNSS
    GPS, Glonass, Beidou, Galileo, QZSSGNSS Systems
    Battery and Charging

    What does it offer on the battery side?

    Manufacturer's official technical values.

    BATTERY AND CHARGING

    The figure the maker promises and the battery's capacity are two different things.

    30 hours (up to)

    up to 30 hours — The figure the maker states · With always-on display on — What that figure measures · 390 mAh — Battery capacity

    up to 30 hoursWith always-on display on390 mAh
    up to 30 hoursThe figure the maker states
    With always-on display onWhat that figure measures
    390 mAhBattery capacity
    Durability

    How well does it resist water and dust?

    Manufacturer's official technical values.

    DURABILITY

    Water pressure and dust ingress are two separate measurements.

    5 ATM

    5 ATM — Water Resistance · IP68 — IP Rating · MIL-STD-810H — MIL-STD-810

    5 ATMIP68MIL-STD-810H
    5 ATMWater Resistance
    IP68IP Rating
    MIL-STD-810HMIL-STD-810
    Who Is It For?

    Where does it stand out?

    A usage guide built from the specs and the editors' tags; not a test result.

    Health Tracking

    Health-focused; heart-rate, sleep and blood-oxygen sensing are on the maker's list.

    Good fit
    Android phone owners

    Good fit
    Daily Use

    A balanced spec set for everyday use: display, battery and camera figures together.

    Good fit
    Editorial Analysis

    Strengths and points to consider

    The Kacbu editors' assessment of the specifications the maker publishes. We do not test devices ourselves, so nothing here is a measured result. Anything taken from an independent review is shown with its publication and date in the Press section.

    Strengths based on the specs
    Up to 3000 nits on an always-on Super AMOLED panel
    Dual-band GNSS — not the same thing as simply having a GPS receiver
    Alongside the electrical heart sensor, the ECG app and irregular rhythm notifications are stated too
    5 ATM of water pressure and an IP68 dust rating, documented separately
    31.5 grams: light enough to wear all day
    Things to consider
    Samsung names the chip only in the page's copy; there is no processor row in the spec sheet
    By Samsung's own footnotes, ECG and irregular rhythm notifications are not enabled in every country
    The 30 hours the maker states were measured with the always-on display running; other use changes the figure
    Wireless networking stops at Wi-Fi 4
    Historical Product Info

    Official launch details

    Instead of tracking today's retail price, Kacbu keeps the product's official launch information as a reference.

    Design🇰🇷 South Korea
    This is not the current retail price — it shows the product's historical, official launch information.
    Specifications

    Galaxy Watch9 40mm specifications

    Click a linked value to see other products that share that same spec, and leave a comment on that spec.

    Display

    Official source: samsung.com
    Screen Size
    1.3
    Display Technology
    Super AMOLED
    Resolution
    438x438
    Peak Brightness
    3000 nit
    Pixel Density
    476 PPIComputed by Kacbu: √(438² + 438²) ÷ 1.3″ = 476 PPI
    Aspect Ratio
    1:1Computed by Kacbu: 438 : 438
    Screen Area
    5.5 cm²Computed by Kacbu: 1.3″ × (438×438) → 5.5 cm²
    Always-On Display
    Yes

    Design

    Official source: samsung.com
    Weight
    31.5 g
    Case Size
    40 mm
    Thickness
    8.6 mm
    Case Material
    Aluminum

    Base Hardware

    Official source: samsung.com
    Memory (RAM)
    2
    Chipset
    Snapdragon Wear Elite Platform
    Internal Storage
    32

    Battery

    Official source: samsung.com
    Battery Capacity
    390 mAh
    Battery Life Mode
    With always-on display on
    Battery Life (hours)
    30

    Health Sensors and Features

    Official source: samsung.com
    ECG App
    Yes
    ECG Sensor
    Yes
    SpO2 Sensor
    Yes
    AFib Detection
    Yes
    Fall Detection
    Yes
    Sleep Tracking
    Yes
    Heart Rate Sensor
    Yes
    Skin Temperature Sensor
    Yes

    Positioning and GNSS

    Official source: samsung.com
    GNSS
    Yes
    Satellite Systems
    GPS, Glonass, Beidou, Galileo, QZSS
    Dual-Band GNSS
    Yes

    Water and Dust Resistance

    Official source: samsung.com
    Military Standard
    MIL-STD-810H
    IP Certification
    IP68
    Water Resistance
    5 ATM

    Wireless Connections

    Official source: samsung.com
    NFC
    Yes
    Wi-Fi
    Wi-Fi 4
    Cellular
    Optional
    Bluetooth
    6.0

    Operating System

    Official source: samsung.com
    Operating System
    Wear OS

    General

    Official source: samsung.com
    Series
    Galaxy Watch

    General — Snapdragon Wear Elite Platform

    Family
    Snapdragon Wear
    Segment
    Smartwatch SoC
    Manufacturer
    Qualcomm

    Cache — Snapdragon Wear Elite Platform

    Cache Note
    Qualcomm does not publish cache sizes

    Power — Snapdragon Wear Elite Platform

    Cooling Solution
    Device dependent

    Platform — Snapdragon Wear Elite Platform

    Socket
    BGA (SoC)
    Manufacturing Process
    3 nm
    Lithography
    3 nm
    Shared Hardware

    Products that share this hardware

    This product's standout specs. You can jump to other models that use the same value.

    Display TechnologySuper AMOLED6 more productsOperating SystemWear OS7 more productsWater Resistance5 ATM32 more products
    Alternatives

    Other models in the same category

    Other products in the same category.

    Apple Watch Series 11 42mm

    Apple Watch Series 11 42mm

    Apple

    View product
    Apple Watch SE 3 44mm

    Apple Watch SE 3 44mm

    Apple

    View product
    Apple Watch SE 3 40mm

    Apple Watch SE 3 40mm

    Apple

    View product
    Apple Watch Ultra 3

    Apple Watch Ultra 3

    Apple

    View product
    Data-backed answers

    Computed answers about the Galaxy Watch9 40mm

    Each answer is computed from spec data and editor tags; where there is no data, there is no page.