Apple
Device summary
Apple
Apple Watch Series 9 41mm
Full specifications
| Basic information | ||
|---|---|---|
| Release year | 2025 | 2023 |
| Starting price | — | — |
| Display size | — | — |
| Dimensions | 34.0 mm × 40.0 mm × 10.7 mm | 35.0 mm × 41.0 mm × 10.7 mm |
| Weight | 26 g | 32 g |
| Front material | Ion-X glass | Ion-X glass or sapphire crystal |
| Back material | — | — |
| Display | ||
| Display technology | Retina LTPO OLED | Always-On Retina LTPO OLED |
| Resolution | 324 × 394 | — |
| Protection | Ion-X glass | Ion-X glass (aluminum) / Sapphire (stainless steel) |
| Peak brightness | — | 2000 nits |
| Performance | ||
| Chipset | Apple S10 SiP | Apple S9 SiP |
| Storage | 64 GB | 64 GB |
| Expandable storage | No | No |
| Battery & charging | ||
| Charging standard | Apple Watch Magnetic Fast Charger | Apple Watch Magnetic Fast Charger |
| Battery type | Built-in rechargeable lithium-ion | Built-in rechargeable lithium-ion |
| Connectivity | ||
| Cellular | LTE (GPS + Cellular models) | LTE (GPS + Cellular models) |
| Wi‑Fi | Wi‑Fi 4 (802.11n) | Wi‑Fi 4 (802.11n) |
| Bluetooth | Bluetooth 5.3 | Bluetooth 5.3 |
| NFC | Yes | Yes |
| Build & durability | ||
| Frame | Aluminum | Aluminum or stainless steel |
| Ingress protection | Water resistance 50m | Water resistance 50m; IP6X dust resistance |
| Basic information | ||
|---|---|---|
| Release year | 2025 | 2023 |
| Starting price | — | — |
| Display size | — | — |
| Dimensions | 34.0 mm × 40.0 mm × 10.7 mm | 35.0 mm × 41.0 mm × 10.7 mm |
| Weight | 26 g | 32 g |
| Front material | Ion-X glass | Ion-X glass or sapphire crystal |
| Back material | — | — |
| Display | ||
| Display technology | Retina LTPO OLED | Always-On Retina LTPO OLED |
| Resolution | 324 × 394 | — |
| Protection | Ion-X glass | Ion-X glass (aluminum) / Sapphire (stainless steel) |
| Peak brightness | — | 2000 nits |
| Performance | ||
| Chipset | Apple S10 SiP | Apple S9 SiP |
| Storage | 64 GB | 64 GB |
| Expandable storage | No | No |
| Battery & charging | ||
| Charging standard | Apple Watch Magnetic Fast Charger | Apple Watch Magnetic Fast Charger |
| Battery type | Built-in rechargeable lithium-ion | Built-in rechargeable lithium-ion |
| Connectivity | ||
| Cellular | LTE (GPS + Cellular models) | LTE (GPS + Cellular models) |
| Wi‑Fi | Wi‑Fi 4 (802.11n) | Wi‑Fi 4 (802.11n) |
| Bluetooth | Bluetooth 5.3 | Bluetooth 5.3 |
| NFC | Yes | Yes |
| Build & durability | ||
| Frame | Aluminum | Aluminum or stainless steel |
| Ingress protection | Water resistance 50m | Water resistance 50m; IP6X dust resistance |
Key differences
The most meaningful measured gaps in size and weight — not an overall winner.
Weight
Apple Watch SE 3 40mm
6 g lighter · minor difference
Height
Apple Watch Series 9 41mm
1 mm taller · minor difference
Width
Apple Watch Series 9 41mm
1 mm wider · minor difference
Thickness
Very similar thickness
What these size differences mean
Calculated from the dimensions shown, rounded to 0.1 mm and 1 g. Percentages use the smaller measurement as the reference. Fold and rotation settings affect the dimensions compared.
- Apple Watch Series 9 41mm is 1 mm (2.9% relative to Apple Watch SE 3 40mm) wider. Check this difference against the width of your current device and pocket opening.
- Apple Watch Series 9 41mm is 1 mm (2.5% relative to Apple Watch SE 3 40mm) taller. This describes the body outline; screen diagonal alone does not tell you the overall size.
- Both have the same listed thickness (10.7 mm) at the displayed precision. Cases and camera protrusions can change the clearance you need.
- Apple Watch SE 3 40mm is 6 g lighter. This is the listed device-weight difference, not a measured comfort rating.
Use these figures to compare physical size. They do not establish one-handed reach, pocket fit, durability or an overall winner.
Sources and measurement notes
Sizometry compares published specifications and calculates differences. These are not hands-on measurements or tests of comfort, performance or pocket fit.
Apple Watch SE 3 40mm
Apple Watch Series 9 41mm
Check the exact model, year, region and configuration on the linked page. References may cover several variants. Folded and unfolded dimensions differ; cases and camera protrusions may change the space a device needs. Drawings share a relative scale and are not calibrated to life size on your screen.