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Head to head

Samsung Galaxy Watch8 40mmvsSamsung Galaxy Watch8 Classic 46mm

Released
2025-07-25Samsung Newsroom UK — Galaxy Watch8 series, retrieved 2026-09-13
Price
£319Samsung Newsroom UK — Galaxy Watch8 series, retrieved 2026-09-13
Security updates until
Not published by the makerSamsung UK — How to update software on Galaxy Watch, retrieved 2026-09-13
Released
2025-07-25Samsung Newsroom UK — Galaxy Watch8 series, retrieved 2026-09-13
Price
£449Samsung Newsroom UK — Galaxy Watch8 series, retrieved 2026-09-13
Security updates until
Not published by the makerSamsung UK — How to update software on Galaxy Watch, retrieved 2026-09-13

1 win for Galaxy Watch8 40mm0 wins for Galaxy Watch8 Classic 46mm0 differences you won’t notice£130 apart at RRP

Verdict: Galaxy Watch8 40mm ahead on 1 row, Galaxy Watch8 Classic 46mm on none

On the makers’ published figures, the Galaxy Watch8 40mm wins on weight (case only) (30 g against 63.5 g). Both state the same peak brightness and battery life (maker's claim). The other 27 rows have no threshold or no direction to judge by, so nobody wins them.

True to scale

Galaxy Watch8 40mm · 42.7 × 40.4 mmGalaxy Watch8 Classic 46mm · 46.4 × 46 mm

Case outlines from each maker’s published dimensions, drawn to scale. A round case is an ellipse at those figures.

Specifications

A win is marked only where the figures can be ranked and the gap is one you could notice on the wrist. A row the site has no threshold for says whether the two differ, and that it is not ranking them. = marks the same figure on both, ≠ not ranked a difference with no ranking. Every figure carries its source.

Body

SpecificationSamsung Galaxy Watch8 40mmSamsung Galaxy Watch8 Classic 46mm
DimensionsDiffers, but not ranked.
42.7 x 40.4 x 8.6 mmOfficial
46.4 x 46 x 10.6 mmOfficial
Case size
40mmOfficial
46mmOfficial
Case shapeSame.
roundOfficial
roundOfficial
Weight (case only)
30gOfficialwins this row
63.5gOfficial

Galaxy Watch8 40mm is ahead here, by a gap you’d notice.

Case materialDiffers, but not ranked.
Armor AluminiumOfficial
Stainless SteelOfficial
Water ratingSame.
5 ATM + IP68 / MIL-STD-810HOfficial
5 ATM + IP68 / MIL-STD-810HOfficial

Display

SpecificationSamsung Galaxy Watch8 40mmSamsung Galaxy Watch8 Classic 46mm
Display typeSame.
Super AMOLED, Full Colour Always On DisplayOfficial
Super AMOLED, Full Colour Always On DisplayOfficial
Display sizeSame.
1.34inOfficial
1.34inOfficial
ResolutionSame.
438 x 438Official
438 x 438Official
Peak brightnessSame.
3000nitsOfficial
3000nitsOfficial
Always-on displaySame.
YesOfficial
YesOfficial

Platform

SpecificationSamsung Galaxy Watch8 40mmSamsung Galaxy Watch8 Classic 46mm
Operating systemSame.
Wear OS 6Official
Wear OS 6Official
ChipSame.
Exynos W1000 (5 core, 3nm)Official
Exynos W1000 (5 core, 3nm)Official
StorageDiffers, but not ranked.
32GBOfficial
64GBOfficial
RAMSame.
2GB3rd party
2GB3rd party

Battery

SpecificationSamsung Galaxy Watch8 40mmSamsung Galaxy Watch8 Classic 46mm
Battery life (maker's claim)Same.
40hOfficial
40hOfficial
Battery capacity
No verified data
445mAhOfficial

Samsung UK — Galaxy Watch8 Classic 46mm specs claims 445 mAh · GSMArena reports 445 mAh

ChargingSame.
Fast Charging (WPC-based wireless charging)Official
Fast Charging (WPC-based wireless charging)Official

Health

SpecificationSamsung Galaxy Watch8 40mmSamsung Galaxy Watch8 Classic 46mm
SensorsDiffers, but not ranked.
Accelerometer, Barometer, Bioelectrical Impedance Analysis Sensor, Electrical Heart Sensor, Gyro Sensor, Geomagnetic Sensor, Infrared Temperature Sensor, Light Sensor, Optical Heart Rate SensorOfficial
Samsung BioActive Sensor (Optical Bio-signal Sensor + Electrical Heart Signal + Bioelectrical Impedance Analysis), Temperature Sensor, Accelerometer, Barometer, Gyro Sensor, Geomagnetic Sensor, Light Sensor, 3D Hall sensorOfficial
ECGSame.
YesOfficial
YesOfficial
Skin temperatureSame.
YesOfficial
YesOfficial
GPSSame.
L1+L5 Dual-Frequency GPS (GPS, Glonass, Beidou, Galileo)Official
L1+L5 Dual-Frequency GPS (GPS, Glonass, Beidou, Galileo)Official

Connectivity

SpecificationSamsung Galaxy Watch8 40mmSamsung Galaxy Watch8 Classic 46mm
Cellular modelSame.
YesOfficial
YesOfficial
Cellular model priceDiffers, but not ranked.
£369Official
£499Official
UK networks with eSIMSame.
EE, Vodafone3rd party
EE, Vodafone3rd party
Wi-Fi
802.11a/b/g/n 2.4GHz+5GHzOfficial
No verified data
BluetoothSame.
5.3Official
5.3Official
NFC paymentsSame.
YesOfficial
YesOfficial

Compatibility

SpecificationSamsung Galaxy Watch8 40mmSamsung Galaxy Watch8 Classic 46mm
Works withSame.
Android 11.0 or higher and with more than 1.5GB of memoryOfficial
Android 11.0 or higher and with more than 1.5GB of memoryOfficial
CompatibilitySame.
Android; some features need a Samsung phoneOfficial
Android; some features need a Samsung phoneOfficial
5 attributes neither watch has a sourced figure for

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

The pairs a buyer of either watch would also weigh. Any two watches in the catalogue can be compared from the chooser.