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Samsung Galaxy Watch8 40mm

42.7 mm40.4 mm8.6 mm
Released
2025-07-25Samsung Newsroom UK — Galaxy Watch8 series, retrieved 2026-09-13
Price
£319Samsung Newsroom UK — Galaxy Watch8 series, retrieved 2026-09-13

The Samsung Galaxy Watch8 40mm went on sale on 25 July 2025, launched at £319 (Samsung Newsroom UK — Galaxy Watch8 series). It has a 1.34-inch display, a weight of 30 g, the Exynos W1000 (5 core, 3nm) chip and 32 GB of storage to start. Samsung claims up to 40 hours per charge. Samsung publishes no end date for its security updates. Every figure in the Samsung Galaxy Watch8 40mm specifications below links the page it came from and the date it was read.

Battery life (maker's claim)

40h

Official

Case size

40mm

Official

Weight (case only)

30g

Official

Water rating

5 ATM + IP68 / MIL-STD-810H

Official

Works with

Works with Android phones. Some features need a Samsung phone.

Samsung’s own words: “Android 11.0 or higher and with more than 1.5GB of memory”Samsung Newsroom UK — Galaxy Watch8 series, retrieved 2026-09-13

UK networks whose own pages list eSIM support for the cellular model: EE, Vodafone.Vodafone UK — eSIM-compatible devices, retrieved 2026-09-13

Specifications

Every figure carries its source, linked and dated.

Body

Dimensions
42.7 x 40.4 x 8.6 mmOfficial
Case size
40mmOfficial
Case shape
roundOfficial
Weight (case only)
30gOfficial
Case material
Armor AluminiumOfficial
Water rating
5 ATM + IP68 / MIL-STD-810HOfficial

Display

Display type
Super AMOLED, Full Colour Always On DisplayOfficial
Display size
1.34inOfficial
Resolution
438 x 438Official
Peak brightness
3000nitsOfficial
Always-on display
YesOfficial

Platform

Operating system
Wear OS 6Official
Chip
Exynos W1000 (5 core, 3nm)Official
Storage
32GBOfficial
RAM
2GB3rd party

GSMArena, retrieved 2026-09-13

Battery

Battery life (maker's claim)
40hOfficial
Charging
Fast Charging (WPC-based wireless charging)Official

Health

Sensors
Accelerometer, Barometer, Bioelectrical Impedance Analysis Sensor, Electrical Heart Sensor, Gyro Sensor, Geomagnetic Sensor, Infrared Temperature Sensor, Light Sensor, Optical Heart Rate SensorOfficial
ECG
YesOfficial
Skin temperature
YesOfficial
GPS
L1+L5 Dual-Frequency GPS (GPS, Glonass, Beidou, Galileo)Official

Connectivity

Cellular model
YesOfficial
Cellular model price
£369Official
UK networks with eSIM
EE, Vodafone3rd party
Wi-Fi
802.11a/b/g/n 2.4GHz+5GHzOfficial
Bluetooth
5.3Official
NFC payments
YesOfficial

Compatibility

Works with
Android 11.0 or higher and with more than 1.5GB of memoryOfficial
Compatibility
Android; some features need a Samsung phoneOfficial
6 attributes without a sourced figure yet

Strap width · Display area · Battery capacity · Charge to 80% · Blood oxygen · Blood pressure. A gap in our data, not a statement about the watch — rows appear as sources are cited.

What it actually costs

New against used, and what the same shop pays for the watch on your wrist.

New

recommended retail

£319

Samsung Newsroom UK — Galaxy Watch8 series, retrieved 2026-09-13

Used, Grade A

cheapest of 2 colours

£145–£160

CeX, read 2026-10-04 · repriced 2026-09-22

Used, Grade B

cheapest of 2 colours

£125–£130

CeX, read 2026-10-04 · repriced 2026-09-22

Used, Grade C

£115

CeX, read 2026-10-04 · repriced 2026-09-22

Trade in yours, Grade A

£63cash£91voucher

CeX, read 2026-10-04 · 44% more as store credit

Prices move; these were read on 2026-10-04. Used and trade-in figures are CeX's own, for an unlocked handset at this device's base storage. CeX prices each colour separately, so a grade shows as the range across them. We hold no stock and take no commission.

Software support

Feature updates until
Not published by the maker
Security updates until
Not published by the maker

Basis: our inference from history

Samsung's UK Galaxy Watch software-update help page loaded this session does not state a numbered OS-generation or calendar end date for this model.

Samsung UK — How to update software on Galaxy Watch, retrieved 2026-09-13

Comparisons

The pairs a buyer of this watch would weigh, row by row with a verdict on each. Any other watch in the catalogue is a chooser away.

Against its own line

Against other Samsung watches

Against other makers