WatchFitTool
Samsung Galaxy Watch8 LTE 40mm — case dimensions and design

Samsung · 2025

Galaxy Watch8 LTE 40mm Size, Dimensions & Wrist Fit

Case Width

40.4mm

Thickness

8.6mm

Lug-to-Lug

42.7mm

Weight

30g

The Galaxy Watch8 LTE 40mm looks in proportion on wrists of 13–19 cm (5.1–7.5 in) round, and fills the wrist at 14–15.5 cm (42.7mm lug to lug).

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Does the Galaxy Watch8 LTE 40mm fit your wrist?

The 40mm suits wrists of about 13–19 cm round; the 44mm, 14.5–20.5 cm. Both work from 14.5 to 19 cm, where it is a choice between more skin either side (the 40mm) and a case that fills the wrist (the 44mm). Under 14.5 cm only the 40mm's lugs stay on the wrist; over 19 cm the 40mm starts to look small.

Wrist round (mm left each side)40mm44mm
14 cm / 5.5 inSweet spot (1.2mm)Overhangs (0.4mm over)
15 cm / 5.9 inSweet spot (2.8mm)Bold (1.2mm)
16 cm / 6.3 inBalanced (4.5mm)Sweet spot (2.8mm)
17 cm / 6.7 inBalanced (6.1mm)Balanced (4.4mm)
18 cm / 7.1 inBalanced (7.7mm)Balanced (6mm)
19 cm / 7.5 inUnderstated (9.3mm)Balanced (7.6mm)
20 cm / 7.9 inUnderstated (10.9mm)Balanced (9.3mm)

How the fit model works · Size chart for every wrist

Which Galaxy Watch8 size fits you?

40mm · LTEViewing

40.4mm · 8.6mm thick · 30g

44mm · LTE

43.7mm · 8.6mm thick · 34g

View this size

The Galaxy Watch8 LTE 40mm in short

  • The 44mm version is 3.3mm wider and 4g heavier.
  • Compared with the previous Galaxy Watch7 LTE 40mm, it is 1.1mm thinner and 3.8g lighter.
  • At 8.6mm, the thinnest of the 9 Samsung watches 39–41mm across.
  • 30g on the wrist. Lighter than 82% of the 38 smartwatches 40mm across that we have weights for.

Compare with another watch

Size, fit and battery side by side, against any smartwatch we list.

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Galaxy Watch8 LTE 40mm battery life

Published runtime

  • Battery life2 days

Where it ranks among Samsung watches

  • Everyday use2 days#30 of 64
  • Capacity325 mAh#32 of 64
See all 64 Samsung watches ranked by battery life

2D Dimension Schematics

Top view
Side view
  • Samsung Galaxy Watch8 LTE 40mm 40.4mm × 42.7mm · 8.6mm thick

3D preview

Samsung Galaxy Watch8 LTE 40mm on a wrist

Open 3D try-on

What size band does the Galaxy Watch8 LTE 40mm take?

Lug width

20mm

Samsung's Dynamic Lug: Samsung says bands from earlier models, including the Galaxy Watch7, don't fit. Look for bands listed for this watch.

Galaxy Watch8 LTE 40mm — Frequently Asked Questions

Is the Samsung Galaxy Watch8 LTE 40mm thick for a 40mm watch?

At 8.6mm, thinner than 100% of the 40 smartwatches 40mm across that we track, so it slides under a cuff more easily than most of its size.

Galaxy Watch8 LTE 40mm specifications

Battery life
2 days
Display
1.34 inches
Resolution
438 x 438 px
Water rating
5 ATM
Strap
20 mm
Storage
32GB
Show all specificationsSamsung's published specification, for reference · checked September 2026

Design

width
40.4
height
42.7
volume
14.84 cm³
weight
30 g
thickness
8.6
ATM rating
5 ATM
resolution
438 x 438 px
screen size
1.34 inches
Display type
OLED/AMOLED
Has a display
Yes
pixel density
327 ppi
width of band
20 mm
water resistance
Water resistant
Always-On Display
Yes
has a touch screen
Yes
is designed for kids
No
waterproof depth rating
50 m
Watch band is replaceable
Yes
Has sapphire glass display
Yes
maximum operating temperature
35 °C
Ingress Protection (IP) rating
IP68
has branded damage-resistant glass
No
lowest potential operating temperature
0 °C

Battery

battery life
2 days
battery power
325 mAh
has wireless charging
Yes
has a removable battery
No
Has a solar power battery
No
has a rechargeable battery
Yes

Sensors

has GPS
Yes
has a compass
Yes
Has a barometer
Yes
has a gyroscope
Yes
Has a cadence sensor
No
has an accelerometer
Yes
Monitors perspiration
No
Has a heart rate monitor
Yes
Has a temperature sensor
Yes
Monitors blood oxygenation levels
Yes

Features

RAM
2GB
release date
2025-07-09
Has a stopwatch
Yes
Has smart alarm
No
Has call control
Yes
Has silent alarm
Yes
has HRV tracking
Yes
internal storage
32GB
measures VO2 max
Yes
Has notifications
Yes
Has ECG technology
Yes
Locates your phone
Yes
has fall detection
Yes
has voice commands
Yes
Acquires GPS faster
Yes
Has vibrating alerts
Yes
shows readiness level
Yes
Can be used to answer calls
Yes
measures resting heart rate
Yes
has irregular heart rate warnings
Yes
has fast/slow heart rate notifications
Yes
Has a built-in camera remote control function
Yes

Connectivity

has NFC
Yes
SIM cards
1 eSIM
Wi-Fi version
Wi-Fi 4 (802.11n)
supports ANT+
No
supports Wi-Fi
Yes
supports Galileo
Yes
Bluetooth version
5.3
has a cellular module
Yes
Is compatible with iOS
No
Is compatible with Android
Yes

Miscellaneous

Has passcode
Yes
Has auto pause
Yes
Is compatible with Windows
No
Is compatible with Mac OS X
No
has an external memory slot
No
Compatible with smart scales
Yes
has a battery level indicator
Yes
has a socket for a 3.5 mm audio jack
No
Compatible with external heart rate monitors
Yes

App & Software

Ad-free
Yes
Free app
Yes
Tracks BMI
Yes
Has coaching
Yes
Includes maps
Yes
Supports routes
Yes
Has achievements
Yes
Has goal setting
Yes
Has exercise diary
Yes
Can be personalised
Yes
Has weight tracking
Yes
Predicts start date
Yes
Tracks water intake
Yes
Has inactivity alerts
Yes
Has period notifications
Yes
Has temperature tracking
Yes
Provides activity reports
Yes
Counts how many calories you've burned
Yes

Activity tracking

Measures pace
Yes
Tracks distance
Yes
Tracks elevation
Yes
Designed for golf
No
Tracks your sleep
Yes
Tracks steps taken
Yes
Designed for diving
No
Has a route tracker
Yes
Has exercise tagging
Yes
Has multi-sport mode
No
Tracks calorie intake
Yes
Provides sleep reports
Yes
Detects activities automatically
Yes
Has a stroke counter for swimming
Yes
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