Compare Apple Watch Series 12 Official Specs by Case Material and Size
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Key Takeaway
The Apple Watch Series 12 comes in 42 mm and 46 mm, and weight depends on the case material. Battery is listed at up to 24 hours of normal use.
It reached Apple Stores worldwide on September 18, 2026, in aluminum, titanium, and ceramic cases.
How much does weight differ by size and material?
These are the values listed on Apple's official specs page.
| Item | 42 mm | 46 mm |
|---|---|---|
| Display resolution | 374×446 | 416×496 |
| Aluminum (GPS) weight | 32.2 g | 39.5 g |
| Titanium weight | 36.5 g | 44.9 g |
| Ceramic weight | 41.7 to 42.8 g | 51.3 to 52.9 g |
| Wrist circumference range | 130 to 200 mm | 140 to 245 mm |
Thickness is listed as 9.7 mm for aluminum and titanium and 9.85 mm for ceramic. At the same size, aluminum is the lightest and ceramic is the heaviest. For a watch you wear all day, weight is a good place to start comparing.
How are the display and chip described?
The screen is an always-on LTPO3 wide-angle OLED with a maximum brightness of 2000 nits (peak) and a minimum of 1 nit. The front cover material is Ceramic Shield 2 on aluminum cases and sapphire crystal on titanium and ceramic cases. The chip is the S11, and storage is listed as 64 GB.
What are the battery and charging figures?
| Item | Official spec |
|---|---|
| Normal use | Up to 24 hours |
| Low Power Mode | Up to 38 hours |
| Outdoor workout | Up to 10 hours |
| Fast charging | About 80% in about 30 minutes |
| 15-minute charge | Up to 12 hours of normal use |
| 5-minute charge | Up to 10 hours of sleep tracking |
All of these are maximums from Apple's test conditions. They can vary with the features you use and your environment.
What do water resistance and sensors look like?
Water resistance is 50 m under ISO 22810:2010 and is described as suitable for swimming. The specs say it is not suitable for scuba diving or water skiing, and dust resistance is rated IP6X. The depth gauge is listed for depths up to 6 m.
The sensors are listed as follows.
- Second-generation electrical heart sensor
- Always-on optical heart sensor
- Blood oxygen sensor
- Wrist temperature sensor
- Compass, always-on altimeter, and more
Keep in mind that readings from health-related sensors do not replace a medical diagnosis.
How do you check connectivity and compatibility?
It supports Wi-Fi 4, Bluetooth 5.3, and L1 GPS, and cellular (LTE) is available on the GPS + Cellular model. Availability of the second-generation ultra wideband chip varies by country. Compatibility, according to the notes at the bottom of the specs, requires iOS 27 or later together with an iPhone 11 or later or an iPhone SE (2nd generation) or later. Start by checking which iPhone you use.
What should you check before buying?
Check in order which size range your wrist falls into, whether the weight feels comfortable for daily wear, and whether you need the cellular model. This article only lays out the order for reading the official figures, without rankings or recommendations.
Where can you find the latest information?
You can check the latest specs and support information on the specs page of Apple Korea's site and in Apple Newsroom. The date checked is 2026-10-08, so look at the official pages again for later changes. Check the KC certification mark separately on the product box and the seller's information.
Frequently Asked Questions
Which size should I pick for my wrist?
The official specs say the 42 mm model fits wrists of 130 to 200 mm and the 46 mm model fits 140 to 245 mm. Actual fit can vary with the band, so trying one on in a store is the most reliable way.
Does 50 m water resistance mean I can swim with it?
The official specs list 50 m water resistance under ISO 22810:2010 and describe it as suitable for swimming. They also say it is not suitable for scuba diving or water skiing.
Under what conditions is the 24-hour battery figure measured?
It is listed as the maximum for normal use. Low Power Mode is listed separately at up to 38 hours and outdoor workouts at up to 10 hours. Actual time depends on how you use the watch.
Sources & Verification Date
- iPhone 18 Pro, Apple Watch Series 12, Apple Watch Ultra 4, and AirPods 5 arrive in stores worldwide (Apple Newsroom 2026-09-18) · Verified
- Apple Watch Series 12 technical specifications (Apple) · Verified
All materials have been verified from official announcements and may have changed since verification.