Sizometry
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Apple Watch SE 3 40mm in Midnight, Front view

Official manufacturer render.

Apple

Apple Watch SE 3 40mm

Watch2025Released
  • Retina LTPO OLED
  • Apple S10 SiP
  • 26 g

Available colors

Selected: Midnight

Physical specifications

26 g

Case weight

40.0 mm

Case height

34.0 mm

Case width

10.7 mm

Case thickness

Release and pricing

Announced
September 9, 2025
Released
September 19, 2025

Display

Display technology
Retina LTPO OLED
Resolution
324 × 394
Protection
Ion-X glass

Performance

Chipset
Apple S10 SiP
Storage
64 GB
Expandable storage
No

Battery & charging

Charging standard
Apple Watch Magnetic Fast Charger
Battery type
Built-in rechargeable lithium-ion

Build & durability

Frame
Aluminum
Front
Ion-X glass
Ingress protection
Water resistance 50m

Connectivity

Cellular
LTE (GPS + Cellular models)
Wi‑Fi
Wi‑Fi 4 (802.11n)
Bluetooth
Bluetooth 5.3
NFC
Yes

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.

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.

Sizometry Analysis

Everyday usability

Estimated from the watch’s size, weight, battery, display, and intended wearing conditions.

  • Wrist comfort

    Very comfortable

    Its compact case and low body weight should remain comfortable throughout a full day.

  • Sleep comfort

    Comfortable

    Its size and weight should remain comfortable for most users overnight.

  • Battery usability

    Data unavailable

    Available battery information is insufficient for a reliable daily-use assessment.

  • Screen and controls

    Easy to use

    Detailed brightness information is unavailable, so outdoor visibility cannot be fully assessed.

  • Workout usability

    Excellent

    Its low weight, water resistance, and GPS support make it well suited to running and gym sessions.

Models and configurations

Storage
64 GB
Connectivity
LTE (GPS + Cellular models)
Colors
MidnightStarlight

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