Size and Weight
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45mm
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Height: 45mm
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Width: 38mm
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Depth: 10.7mm
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Weight (aluminum, GPS): 38.7 grams
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Weight (aluminum, GPS + Cellular): 39.0 grams
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Weight (stainless steel): 51.5 grams
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Fits 140–245mm wrists
Hardware and Buttons
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Digital Crown
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Microphone
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Side button
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Electrical heart sensor
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Speaker/air vent
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Optical heart sensor
Controls
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Digital Crown with haptic feedback
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Side button
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Double tap gesture
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Siri with on‑device processing
Chip
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S9 SiP with 64‑bit dual‑core processor
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4‑core Neural Engine
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64GB capacity
Sensors
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Electrical heart sensor
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Third‑generation optical heart sensor
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Temperature sensing1
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Compass
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Always‑on altimeter
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High‑g accelerometer
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High dynamic range gyroscope
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Ambient light sensor
Health and Wellness
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ECG app2
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Cycle Tracking app with retrospective ovulation estimates3
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Heart Rate app
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High and low heart rate notifications
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Irregular rhythm notifications4
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Medications app
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Mindfulness app
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Noise app
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Sleep app including sleep stages
Display
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Always‑On Retina LTPO OLED display
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Edge‑to‑edge display
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Ion‑X front glass (aluminum cases)
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Sapphire front crystal (stainless steel cases)
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Up to 2000 nits maximum brightness
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1 nit minimum brightness
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326 pixels per inch
Power and Battery Life
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All‑day battery life, up to 18 hours of normal use5
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Up to 36 hours in Low Power Mode5
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Built‑in rechargeable lithium‑ion battery
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Fast‑charge capable6
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Up to 80% charge in about 45 minutes6
Operating System
watchOS
watchOS is the world’s most advanced wearable operating system, with apps and features designed to keep you active, healthy, safe, and connected.
Workouts and Activity
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Running
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Custom interval workouts
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Customizable Workout Views
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Heart Rate Zones
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Race Route
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Stride length, ground contact time, and vertical oscillation
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Automatic track detection
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Multisport workout
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Hiking
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Bearing, incline, elevation, and coordinates
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Custom waypoints
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Automatically generated waypoints to cellular connectivity
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Backtrack GPS data
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Topographic maps for over 1000 national and regional parks (U.S. only)
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Cycling
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Average speed, elevation gained, and distance
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Connection to cycling accessories via Bluetooth
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Functional Threshold Power
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Power Zones
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Cadence
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Live Activity on iPhone
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Swimming
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Pool swim or open water swim
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Splits and auto sets
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SWOLF score
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Automatic stroke detection
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Kickboard
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Average pace, total distance, and laps
More Workouts
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Walk
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Elliptical
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Rower
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Stair Stepper
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HIIT
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Yoga
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Functional Strength Training
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Dance
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Cooldown
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Core Training
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Pilates
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Tai Chi
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Wheelchair
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Kickboxing
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Multisport
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Other
Safety
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Emergency SOS7
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International emergency calling8
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Crash Detection7
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Fall Detection
Durability
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Water resistance 50m (swimproof)9
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Dust resistance IP6X10
Connectivity
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L1 GPS, GNSS, Galileo, and BeiDou
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LTE and UMTS11
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Wi‑Fi 4 (802.11n)
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Bluetooth 5.3
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Second‑generation Ultra Wideband chip12
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Apple Pay
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GymKit
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Supports Apple Watch for kids using Family Setup13
Reviews
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