Apple Watch Ultra 4

Works with: iPhone only
Display: LTPO OLED
Case sizes: 49 mm
Battery: 2.1 days
GPS battery: 25 hours
Water resistance: 10 ATM
Weight: 63 g
Cellular: 5G version

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Apple Watch Ultra 4 at a glance

Battery

Charge most nights

Up to 50 hours in smartwatch mode. 25 hours with GPS.
GPS

Multi-band GPS

Maps on the wrist. Runs and rides without your phone.
Display

LTPO OLED

Up to 3,000 nits and always-on option.
Health

ECG on the wrist

Measures ECG, blood oxygen, skin temperature and HRV.
Phone & smart

iPhone only

LTE, payments, music and calls.
Build

10 ATM water rating

63 g. Sapphire lens. MIL-STD-810.

Apple Watch Ultra 4 full specifications

Overview

Brand	Apple
Model	Apple Watch Ultra 4
Series	Apple Watch Ultra
Replaces	Apple Watch Ultra 3
Versions	Natural, Black
Colours	Natural, Black

Platform & apps

Needs an iPhone, running watchOS.

It has an app store for extra apps and watch faces. Oceanic+ adds extra insights, but the core features are free.

Operating system	watchOS
Works with	iPhone only
Minimum iOS	iOS 27
Chipset	S11
Storage	64 GB
App store	Yes
Subscription	Optional
Subscription name	Oceanic+
Subscription features	Dive computer app

Display

A bright, colourful screen that looks like a phone display.

Up to 3,000 nits and always-on option.

Display type	LTPO OLED
Display name	Always-On Retina display
Resolution	422 x 514
Pixel density	326 ppi
Peak brightness	3,000 nits
Colour display	Yes
Always-on display	Yes
Controls	touchscreen, buttons, crown, action button

Design & durability

A 49 mm case weighing 63 g.

Rated 10 ATM: fine for swimming, snorkelling and water sports. A sapphire lens resists scratches. Tested to MIL-STD-810 for shock, heat and cold.

Case sizes	49 mm
Case shape	Rectangular
Dimensions	49 x 44 x 12 mm
Thickness	12 mm
Weight (case)	63 g
Case material	Titanium, Grade 5
Lens	sapphire
Fits wrists	130-210 mm
Water resistance	10 ATM
IP rating	IP6X
Water standard	ISO 22810:2010
MIL-STD-810 tested	Yes
Operating temperature	-20 to 55 °C
Max altitude	9,000 m

Battery

Charge most nights: up to 50 hours in smartwatch mode.

With GPS on, up to 25 hours. Makers test with their own settings, so treat these as best-case figures.

Battery (smartwatch mode)	2.1 days
Battery (GPS)	25 hours
All battery modes	Smartwatch: 2.1 days; Battery saver: 3.5 days; GPS: 18 hours; GPS: 25 hours; Max battery GPS: 45 hours
Battery type	Lithium-ion
Charging	puck
Wireless charging	Yes
Fast charging	Up to 80% charge in about 45 minutes

GPS & navigation

Built-in multi-band GPS for accurate tracks, even near tall buildings and trees.

You can download maps to the watch.

GPS	Built-in
Multi-band GPS	Yes
Satellite systems	GPS, Galileo, QZSS, BeiDou
Maps	Downloadable maps
Preloaded regions	U.S. national and regional parks
Navigation features	Backtrack GPS data, Custom waypoints, Offline maps with custom route creation, Elevation alerts, Compass with bearing, incline, elevation, and coordinates

Health & sensors

A health-focused watch: it measures ECG, blood oxygen, skin temperature and HRV.

For sleep, it offers a nightly sleep score. It can warn you about an irregular heart rhythm. ECG availability can depend on your country.

Sensors	optical HR, ECG electrode, SpO2, skin temperature, accelerometer, gyroscope, altimeter, compass, ambient light, thermometer, depth
Heart-rate sensor	always-on optical heart sensor
Heart-rate tracking	24/7
ECG	Yes
Irregular rhythm alerts	Yes
High/low heart-rate alerts	Yes
Heart-rate variability	Yes
Blood oxygen (SpO2)	Yes
Skin temperature	Yes
Respiration rate	Yes
Hypertension alerts	Yes
Sleep tracking	Sleep score
Sleep apnea alerts	Yes
Stress tracking	Yes
Readiness score	Readiness
Cycle tracking	Yes

Safety

Detects hard falls and can call for help if you don't respond.

SOS works by satellite.

Emergency SOS	Satellite
Fall detection	Yes
Crash detection	Yes
Satellite messaging	Yes
Check-ins	Yes
Siren	Yes

Training

Built for training, with the metrics serious athletes use.

It adds a triathlon mode and running power.

Triathlon / multisport	Yes
Swim tracking	Pool and open water
Training metrics	VO2 max, Training Load / Workout Effort Tracking, heart rate zones, Race Route, Pacer, Cadence, Stride Length, Ground Contact Time, Vertical Oscillation, and Running Power
Running dynamics	Yes
Wrist running power	Yes
External sensors	power meter

Smart features

Smart extras include an LTE version, contactless payments, music storage and calls on the wrist.

Voice assistant: Siri. LTE needs a carrier plan.

Notifications	Yes
Message replies	iPhone
Calls on the watch	Yes
Speaker	Yes
Microphone	Yes
Voice assistant	Siri
Contactless payments	Yes
Payment service	Apple Pay
Cellular	5G version available
Music storage	Yes
Wi-Fi	Wi-Fi 4 (802.11n)
Bluetooth	Bluetooth 5.3
Ultra-wideband	Yes
Find my phone	Yes
Find my watch	Yes
Flashlight	Yes

Diving, golf & more

It works as a dive computer for single-gas scuba.

Rated to 40 m.

Specialist modes	ski, golf
Diving	Single-gas dive computer
Max dive depth	40 m
Dive standard	EN 13319

Specs compiled from Apple's product pages and datasheets. Manufacturers revise hardware between versions, so check the version on the box. Spotted an error? Tell us.