Samsung · 2021
Galaxy Watch 4 - LTE · 40mmSize, Dimensions & Wrist Fit
Case Width
40.4mm
Thickness
9.8mm
Lug-to-Lug
39.3mm
Weight
25.9g
The Samsung Galaxy Watch 4 - LTE · 40mm sits best on flat wrist widths of about 41–56mm (≈ 10.9–15.0cm wrist circumference). Adjust the slider below to check your wrist.
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The Galaxy Watch 4 - LTE · 40mm in short
The figures that decide whether this watch suits you, pulled out of the full specification sheet further down.
- Between 40 hours and 2 days per charge depending on the power mode — smartwatch at best, battery saver at worst.
- Water rated to 50 m.
- 25.9g on the wrist. Lighter than 100% of the 40mm watches we have weights for.
- 1.2 inches OLED/AMOLED display, always-on capable.
- Takes 20mm bands, so third-party straps fit without an adapter.
Does the Galaxy Watch 4 - LTE · 40mm fit your wrist?
Drag the slider to your wrist width and see the Galaxy Watch 4 - LTE · 40mm overlaid at true scale. Lug-to-lug — not case diameter — decides whether a watch overhangs your wrist.
Happy with the fit? Check current availability for the Galaxy Watch 4 - LTE · 40mm.
Find it on Amazon2D Dimension Schematics
The Galaxy Watch 4 - LTE · 40mm drawn to scale — from above, and in profile against the wrist. Built from the measurements, so it works whether or not the watch has a photo.
- Samsung Galaxy Watch 4 - LTE · 40mm40.4mm × 39.3mm · 9.8mm thick
Samsung Galaxy Watch 4 - LTE · 40mm on a wrist
Put the Galaxy Watch 4 - LTE · 40mm on an arm sized to your own wrist and turn it — the view a photograph on a white background never gives you.
- Samsung Galaxy Watch 4 - LTE · 40mm — 40.4mm case, standing 9.8mm 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 it 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.
Which Galaxy Watch 4 - LTE size fits you?
This model comes in 2 versions. Set your measurement and each one reports its own verdict — tap any size to open its page.
Which of these fits your wrist?
Roughly a 14.7cm wrist circumference — the measurement a tape gives you. Compared against lug-to-lug where we have it, case width otherwise.
All 2 Galaxy Watch 4 - LTE variants fit this wrist. The 44.4mm · LTE gives you the most presence without overhanging; the smallest is the discreet end of the range.
- Width
- 40.4mm
- Thick
- 9.8mm
- Weight
- 25.9g
7.9mm clear a side
- Width
- 44.4mm
- Thick
- 9.8mm
- Weight
- 30.3g
5.9mm clear a side
View this sizeHow long the Galaxy Watch 4 - LTE · 40mm lasts, by power mode
Runtime changes by a factor of 1 depending on what you leave switched on. Bars are scaled against the longest mode.
- Smartwatch2 days
- Battery Saver40 hours
What size band does the Galaxy Watch 4 - LTE · 40mm take?
Lug width
20mm
Any 20mm strap fits, so you are not restricted to Samsung's own bands. Quick-release pins let you swap without tools — check that a replacement lists 20mm and quick-release before buying.
Affiliate disclosure: As an Amazon Associate, WatchFitTool earns from qualifying purchases. If you buy through links on this page, we may earn a commission at no extra cost to you. Learn more.
Galaxy Watch 4 - LTE · 40mm specifications
The figures that decide a purchase, followed by every line Samsung publishes.
- Battery life
- 2 days
- Display
- 1.2 inches
- Resolution
- 396 x 396 px
- Water rating
- 5 ATM
- Glass
- Gorilla Glass DX+
- Strap
- 20 mm
- Storage
- 16GB
- Charging
- 2 hours
Full specification sheet
117 published lines across 8 groups, unedited
Design
- width
- 40.4
- height
- 39.3
- volume
- 15.56 cm³
- weight
- 25.9 g
- thickness
- 9.8
- ATM rating
- 5 ATM
- resolution
- 396 x 396 px
- screen size
- 1.2 inches
- Display type
- OLED/AMOLED
- Has a display
- pixel density
- 455 ppi
- width of band
- 20 mm
- water resistance
- Waterproof
- Always-On Display
- has a touch screen
- Gorilla Glass version
- Gorilla Glass DX+
- waterproof depth rating
- 50 m
- Watch band is replaceable
- Has sapphire glass display
- Ingress Protection (IP) rating
- IP68
- has branded damage-resistant glass
Battery
- charge time
- 2 hours
- battery life
- 2 days
- battery power
- 247 mAh
- has wireless charging
- has a removable battery
- Has a solar power battery
- has a rechargeable battery
- battery life in power save mode
- 40 hours
Sensors
- has GPS
- has a compass
- Has a barometer
- has a gyroscope
- Has a cadence sensor
- has an accelerometer
- Monitors perspiration
- Has a heart rate monitor
- Has a temperature sensor
- Monitors blood oxygenation levels
Features
- RAM
- 1.5GB
- CPU speed
- 2 x 1.18 GHz
- release date
- 2021-08-11
- Has a stopwatch
- Has smart alarm
- warranty period
- 1 years
- Has call control
- Has silent alarm
- has HRV tracking
- internal storage
- 16GB
- measures VO2 max
- Has notifications
- Has ECG technology
- Locates your phone
- has a front camera
- has fall detection
- has voice commands
- Acquires GPS faster
- Has vibrating alerts
- number of microphones
- 1
- shows readiness level
- Can be used to answer calls
- measures resting heart rate
- has irregular heart rate warnings
- has fast/slow heart rate notifications
- Has a built-in camera remote control function
Connectivity
- has NFC
- SIM cards
- 1 eSIM
- Wi-Fi version
- Wi-Fi 4 (802.11n)
- supports ANT+
- supports Wi-Fi
- supports Galileo
- Bluetooth version
- 5
- has a cellular module
- Is compatible with iOS
- Is compatible with Android
Miscellaneous
- has aptX
- Has passcode
- Has auto pause
- Is compatible with Windows
- Is compatible with Mac OS X
- has an ambient light sensor
- has an external memory slot
- Compatible with smart scales
- has a battery level indicator
- has a socket for a 3.5 mm audio jack
- Compatible with external heart rate monitors
App & Software
- Ad-free
- Free app
- Tracks BMI
- Has coaching
- Supports routes
- Has achievements
- Has goal setting
- Has exercise diary
- Has weight tracking
- Predicts start date
- Tracks water intake
- Has inactivity alerts
- Has period notifications
- Has temperature tracking
- Doesn’t require account
- Provides activity reports
- Counts how many calories you've burned
Activity tracking
- Measures pace
- Tracks distance
- Tracks elevation
- Designed for golf
- Tracks your sleep
- Tracks steps taken
- Designed for diving
- Has a route tracker
- Has exercise tagging
- Has multi-sport mode
- Tracks calorie intake
- Provides sleep reports
- Detects activities automatically
- Has a stroke counter for swimming
Compare the Galaxy Watch 4 - LTE · 40mm head to head
How each one differs in the three measurements you can feel on the wrist. Figures are relative to the Galaxy Watch 4 - LTE · 40mm.
Samsung
Galaxy Watch8 - Wi-Fi · 40mm
- Width
- same mm
- Thick
- -1.2mm
- Weight
- +4.1g
Samsung
Galaxy Watch8 - LTE · 40mm
- Width
- same mm
- Thick
- -1.2mm
- Weight
- +4.1g
Samsung
Galaxy Watch7 - Wi-Fi · 40mm
- Width
- same mm
- Thick
- -0.1mm
- Weight
- +7.9g
Samsung
Galaxy Watch7 - LTE · 40mm
- Width
- same mm
- Thick
- -0.1mm
- Weight
- +7.9g
Alternatives to the Galaxy Watch 4 - LTE · 40mm
Watches that cover a similar amount of wrist, with the measurements that separate them.
Samsung
Galaxy Watch8 - Wi-Fi · 40mm
- Width
- 40.4mm
- Thick
- 8.6mm
- Weight
- 30g
Samsung
Galaxy Watch8 - LTE · 40mm
- Width
- 40.4mm
- Thick
- 8.6mm
- Weight
- 30g
Samsung
Galaxy Watch7 - Wi-Fi · 40mm
- Width
- 40.4mm
- Thick
- 9.7mm
- Weight
- 33.8g
Samsung
Galaxy Watch7 - LTE · 40mm
- Width
- 40.4mm
- Thick
- 9.7mm
- Weight
- 33.8g
Samsung
Galaxy Watch 4 - Wi-Fi · 40mm
- Width
- 40.4mm
- Thick
- 9.8mm
- Weight
- 25.9g
Samsung
Galaxy Watch Active2 - LTE · Stainless Steel · 40mm
- Width
- 40mm
- Thick
- 10.9mm
- Weight
- 37g
Galaxy Watch 4 - LTE · 40mm — Frequently Asked Questions
Will the Samsung Galaxy Watch 4 - LTE · 40mm fit my wrist?
The Samsung Galaxy Watch 4 - LTE · 40mm looks balanced on flat wrist widths of roughly 41–56mm (about 10.9–15.0cm circumference). Drag the slider above to check it against your own measurement.
What size band does the Samsung Galaxy Watch 4 - LTE · 40mm take?
20mm. Any 20mm strap fits, so you are not limited to Samsung's own bands — look for a quick-release fitting if you want to swap without tools.
How long does the Samsung Galaxy Watch 4 - LTE · 40mm battery last?
Between 40 hours and 2 days per charge, depending on the power mode. Samsung rates Smartwatch at 2 days and Battery Saver at 40 hours; the chart above lists all 2 modes.
Is the Samsung Galaxy Watch 4 - LTE · 40mm thick for a 40mm watch?
At 9.8mm, thinner than 66% of 40mm watches, so it slides under a cuff more easily than most of its size. Thickness, not case width, is what decides whether a watch catches on a shirt cuff.
Should I get the 40.4mm or 44.4mm Galaxy Watch 4 - LTE?
The Galaxy Watch 4 - LTE comes in 2 case sizes — 40.4mm, 44.4mm. Which one suits you depends on the flat width of your wrist rather than preference: the larger sizes need a wider wrist to sit inside the edge. Set your measurement in the size picker above and each variant reports its clearance in millimetres.
What other watches are the same size as the Samsung Galaxy Watch 4 - LTE · 40mm?
TAG Heuer Aquaracer Professional 200 Solargraph 40 UK Limited Edition, Xiaomi Redmi Watch 6, Vivo Watch GT 2 - Bluetooth, Huawei Watch Fit 4 Pro all sit within half a millimetre of the Samsung Galaxy Watch 4 - LTE · 40mm's 40.4mm case, so they cover the same amount of wrist.
What is the lug-to-lug of the Samsung Galaxy Watch 4 - LTE · 40mm?
39.3mm, against a 40.4mm case width. Lug-to-lug is the measurement that decides overhang: if it exceeds the flat width of your wrist, the lugs sit past the edge no matter how modest the case diameter looks.
