Apple Watch Ultra 4
Quick details
Released
September 2026
Dimensions
49 x 44 x 12 mm
Operating system
watchOS 27
Display 49 mm Grade 5 titanium case; Always-On Retina LTPO3 wide-angle OLED; up to 3,000 nits
Battery life Up to 50 hours; up to 84 hours in Low Power Mode; up to 45 hours Max Extended Workout
Water resistance 10 ATM; IP6X; MIL-STD 810H; recreational scuba diving to 40 m
GPS Yes
Sensors Health Sensing System with 3rd-generation electrical heart sensor, always-on optical heart sensor, Blood Oxygen, temperature, compass, altimeter, accelerometer, gyroscope, ambient light, depth and water temperature
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Technical specifications
General
Release date 2026-09-18
Product type Smartwatch
Physical size 49 x 44 x 12 mm
Weight 63.0 g (Natural), 63.1 g (Black)
Material Grade 5 titanium case
Water resistance 10 ATM; IP6X; MIL-STD 810H; recreational scuba diving to 40 m
Color options Natural Titanium, Black Titanium
Display type Always-On Retina LTPO3 wide-angle OLED
Display size 49 mm case
Display resolution 422 x 514 pixels
Display brightness Up to 3,000 nits
Display protection Flat sapphire crystal display
Battery Rechargeable lithium-ion battery
Battery life Up to 50 hours normal use; up to 84 hours in Low Power Mode; up to 18 hours outdoor workout; up to 25 hours Extended Workout; up to 45 hours Max Extended Workout
Charging USB-C magnetic fast charging; up to 80% in about 45 minutes
Sensors
GNSS type Built-in dual-band GNSS
GPS Yes
GALILEO Yes
GLONASS No
QZSS Yes
Beidou Yes
Accelerometer Yes
Gyroscope Yes
Barometric altimeter Yes
Compass Yes
Ambient light sensor Yes
Optical heart rate Yes (always-on optical heart sensor; high-frequency background tracking)
Electrical heart rate Yes
SpO2 Yes
Temperature Yes
Galvanic skin response No
Microphone Yes
Speakers Yes
Vibration motor Yes
Health & activity tracking
Steps Yes
Distance Yes
Calories burned Yes
Floors Yes
Sports tracking Yes
Sleep Yes
Heart rate Yes
HRV Yes (Up to 24x more frequent than Ultra 3)
Stress No
Blood oxygen Yes
Respiration rate Yes
Skin temperature Yes
ECG Yes
Blood pressure Hypertension notifications (no direct blood-pressure measurement)
Body composition No
Glucose No
Hydration level No
UV exposure No
Calorie intake No
Hyperglycemia risk assessment No
Arterial stiffness detection No
Pulse wave arrhythmia analysis Yes
Readiness Yes
Daily smart features
Smartphone compatibility iPhone 11 or later or iPhone SE (2nd generation or later) with iOS 27 or later
Operating system at launch watchOS 27
Processor Apple S11, 64-bit dual-core processor; 4-core Neural Engine; Audio Intelligence
Storage 64 GB
Bluetooth Yes (5.3)
Wi-Fi Yes (Wi-Fi 4 / 802.11n, 2.4/5 GHz)
NFC / connected pay Yes (Apple Pay)
UWB Yes (2nd-generation UWB)
Cellular Yes (5G RedCap and LTE on supported regional models)
Smartphone notifications Yes
Bluetooth calling Yes (standalone on cellular models; via paired iPhone otherwise)
Smartphone music control Yes
On-board music storage Yes
Voice assistant Siri AI powered by Apple Intelligence
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These technical specs are correct to the best of our knowledge at the time of publishing.
