Full specifications, features and battery life for the Apple Watch Series 12, the brand’s mainstream model.
| Manufacturer | Apple |
| Type | GPS smartwatch |
| Series | Watch Series |
| Released | 2026 |
| Price at launch | From $399 / £369 / €449 |
| Predecessor | Apple Watch Series 11 |
| Successor | — |
| Case sizes | 42mm, 46mm |
| Processor | S11 SiP |
Specifications and features as at launch. Requires iPhone 11 or newer with iOS 27 or later.
Expert opinion | What’s new | Specifications | Battery life | Features | Comparisons | Further reading
Expert opinion
Series 12 replaces the periodic optical heart rate sampling of Series 11 with a new Health Sensing System that measures continuously every five seconds throughout the day. Apple claims this is the most accurate heart rate sensing in any wearable, based on a study of over 1,000 participants. HRV is now measured up to 24 times more frequently than Series 11 and split into two variants: Recovery HRV for daily stress and readiness signals, and overall HRV for longer-term cardiovascular insight. The Readiness app integrates these signals with training load, sleep score and vitals into a 0–10 daily score with a plain-English recommendation. For endurance athletes who currently use third-party recovery apps such as Correlate or Cinder, Readiness replaces the core function of those apps natively. The S11 chip brings Apple Intelligence and Audio Intelligence. Outdoor workout battery rises to 10 hours from 8, and Low Power Mode rises to 38 hours. A 15-minute charge delivers 12 hours of use, up from 8 hours on Series 11. Aluminium models gain Ceramic Shield 2, rated 60% tougher than the Ion-X glass on Series 11. The ceramic case option returns for the first time since Series 5, in pearl white and night blue.
Apple Watch Series 12
Smart sport watch
RRP from $399
£369, €449
- use code:
Get it nowOrder now – Apple Watch Series 12 Also sold direct byWhat’s new versus Series 11
Hardware-exclusive (Series 12 only)
- New Health Sensing System: more capable optical sensors with larger, more power-efficient green LEDs; eight photodiode windows with double photodiodes in each (up from four single windows on Series 11); ECG electrode surface area +24%; background HR switched from infrared to green LEDs, now samples every 5 seconds all day
- HRV measured up to 24x more often (every 5 minutes); RMSSD and SDNN both exposed; Recovery HRV and overall HRV variants
- Readiness app: daily 0–10 score (Recover / Pace Yourself / Ready / Go For It) — requires Series 12 or Ultra 4
- Daytime vitals view
- Improved calorie estimates from more accurate continuous HR data
- S11 SiP processor (up from S10); Audio Intelligence via S11 Secure Exclave: Sound Recognition, Live Rewind, Siri Recap, Shazam (Live Rewind and Siri Recap arrive in beta late 2026)
- Ceramic Shield 2 on aluminium models, 60% tougher than Ion-X on Series 11
- Ceramic case option returns (pearl white, night blue)
- New aluminium finishes: dark bronze, black, light gold, space gray. New titanium: radiant gold.
- Outdoor workout battery rises to 10 hours (from 8); Low Power Mode rises to 38 hours (from 36)
- 15-minute charge delivers 12 hours of use (up from 8 hours); 5-minute charge delivers 10 hours sleep tracking
watchOS 27 features (also available on Series 9, 10, 11, Ultra 2, Ultra 3, SE 3)
- Siri AI powered by Apple Intelligence (beta, English first, not initially available in EU)
- Single tap gesture selects highlighted Smart Stack widget; expanded Smart Stack suggestions
- Steps watch face complication; improved step count, distance algorithms and step sync between Health and Fitness apps
- Perimenopause and menopause support in Cycle Tracking
- Workout Buddy without iPhone nearby (requires Wi-Fi or cellular), now in Spanish
- Check In safety feature
- Health Age in redesigned iPhone Health app (iOS 27; available to all supported watch users)
Everyday battery life (24 hours), case sizes (42mm/46mm), cellular (5G RedCap), Wi-Fi, Bluetooth and NFC are unchanged.
Apple Watch Series 12
Smart sport watch
RRP from $399
£369, €449
- use code:
Get it nowOrder now – Apple Watch Series 12 Also sold direct bySpecifications
| Display | |
|---|---|
| Type | LTPO3 OLED, always-on, 1Hz refresh |
| Area | 970 sq mm (42mm); 1,196 sq mm (46mm) |
| Resolution | 374 x 446px (42mm); 416 x 496px (46mm); 326 ppi both sizes |
| Brightness | 2,000 nits max, 1 nit min |
| Glass | Ceramic Shield 2 (aluminium); sapphire crystal (titanium and ceramic) |
| Physical (46mm) | |
| Dimensions | 46 x 40 x 9.7mm (aluminium/titanium); 47 x 41 x 9.85mm (ceramic) |
| Weight | 38.6–39.5g (aluminium); 44.9g (titanium); 51.3g (pearl white ceramic); 52.9g (night blue ceramic) |
| Wrist fit | 140–245mm |
| Physical (42mm) | |
| Dimensions | 42 x 37 x 9.7mm (aluminium/titanium); 43 x 37 x 9.85mm (ceramic) |
| Weight | 31.5–32.2g (aluminium); 36.5g (titanium); 41.7g (pearl white ceramic); 42.8g (night blue ceramic) |
| Wrist fit | 130–200mm |
| Physical (both sizes) | |
| Materials | Aluminium: dark bronze, black, light gold, space gray. Titanium: natural, radiant gold. Ceramic: pearl white, night blue. |
| Water resistance | 50m (ISO 22810:2010); IP6X dust resistant. Not rated for scuba diving or high-speed water sports. |
| Processor | S11 SiP; dedicated Secure Exclave for Audio Intelligence; 4-core Neural Engine |
| Storage | 64GB |
| © the5krunner. Link required. | |
| Sensors and positioning | |
| GNSS | Precision L1: GPS, GLONASS, Galileo, QZSS, BeiDou |
| Heart rate | Health Sensing System: more capable optical sensors with larger, more power-efficient green LEDs; eight photodiode windows with double photodiodes in each (up from four single windows on Series 11); ECG electrode surface area +24% vs Series 11; green LEDs used for continuous background HR (previously infrared); measures every 5 seconds all day; electrical ECG |
| Altimeter | Barometric, always-on |
| Compass | Magnetic |
| Other | SpO2, skin temperature, depth gauge (to 6m), water temperature, high-g accelerometer, high dynamic range gyroscope, ambient light sensor |
| Connectivity and battery | |
| Cellular | 5G RedCap and LTE (models A3582, A3587) |
| Wireless | Wi-Fi 4 (802.11n), 2.4GHz and 5GHz; Bluetooth 5.3; UWB (2nd gen); NFC; GymKit. No ANT+. |
| Battery, normal use | Up to 24 hours |
| Battery, Low Power Mode | Up to 38 hours |
| Battery, outdoor workout | Up to 10 hours |
| Fast charging | 80% in about 30 minutes; 15 minutes gives 12 hours normal use; 5 minutes gives 10 hours sleep tracking |
| Operating system | watchOS 27 at launch |
Battery life
Apple claims up to 24 hours of normal use, unchanged from Series 11. Low Power Mode rises to 38 hours. Outdoor workout battery rises to 10 hours, up from 8 hours on Series 11. Fast charging is faster: a 15-minute charge delivers 12 hours of use, up from 8 hours on Series 11, and a 5-minute charge gives 10 hours of sleep tracking. The 0–80% charge time of about 30 minutes is unchanged. Daily charging remains necessary for all-day use with overnight sleep tracking.
Features
Full feature detail is covered on the Apple Watch specifications index.
- Readiness app: daily 0–10 score with actionable recommendation, updates throughout the day
- Vitals app with daytime and overnight views, including Recovery HRV
- Health Sensing System: continuous heart rate every five seconds, dual HRV variants
- Audio Intelligence: Sound Recognition on-watch; Live Rewind and Siri Recap arriving in beta late 2026
- Hypertension notifications, sleep apnea notifications, sleep stage tracking, sleep score
- Check In, Fall Detection, Crash Detection, Emergency SOS, Flashlight, Backtrack, Noise monitoring
- Apple avoids the word “broadcast”, but GymKit should send heart rate to compatible gym equipment after an NFC tap; untested here, as the equipment is hard to find.
- Workout Buddy without iPhone nearby (requires Wi-Fi or cellular), now in Spanish
- Health Age in redesigned iPhone Health app — available to all iOS 27 users, not exclusive to Series 12
Comparisons and upgrade guides
- Apple Watch Series 12 upgrade guide, whether to upgrade from an older Series watch
- Apple Watch Series 12 vs Series 11, what changed
- Apple Watch Ultra 4 vs Series 12, same software, different hardware
- Galaxy Watch vs Apple Watch charging speed, who is ahead
Further reading
- Apple Watch Series 11 specifications
- Best Apple Watch for sport buyer’s guide
- Apple Watch specifications index
- Apple heart rate accuracy white paper (PDF)
Small things I always use
- Garmin 90-degree charging adapter: Charges your Garmin from any USB-C cable. Essential when travelling. I use one.
- Body Glide: The blue anti-chafe stick swimmers and runners carry. I use it.
- Speedo earplugs: Fewer ear infections and no cold-water dizziness. I use them.
- Dryrobe Advance: My winter changing robe for open-water swims. I use one. A cheaper option is the AONYIYI changing robe.
- Maurten: Race fuel that stays easy on the stomach. I use them.
- Beet It Sport nitrate shots: Beetroot shots I take in the days before a race. I use them.
- Garmin charging puck: The quickest way to top up before a session. I use one.
- Injinji: Toe socks that stop rubbing, so you run more. I use them.
- Ultimate toe protectors: Stop black toenails on long runs. They work. I use them.
- Compressport R2 v2 calf sleeves: My calf sleeves of choice. I use them.
- Cellucor C4: My pre-workout before hard sessions.
- TPU tubes: Schwalbe Aerothan, Tubolito and Pirelli SmarTube. Light, tiny spares. I use all three.
- G8 insoles: Adjustable insoles that are good. I use them.
- Cycplus Cube: A 97g electric pump that gets a road tyre rideable in two minutes. I carry one. 5% off with code THE5KRUNNER.
Watches and sensors
- Polar H10: My daily driver for waking HRV.
- Polar Verity Sense: My backup arm-worn HR sensor.
- Nomad bedside charger: Charges my iPhone and Apple Watch overnight. I use it, and many of their bands.
- Train.Red: The best muscle oxygen sensor I’ve used.
- Tymewear: Accurate heart rate and reliable ventilatory zones. I use it to pace endurance rides over an hour.
- Garmin Forerunner 970: A pro-grade triathlon watch. I use this.
- Apple Watch Ultra 4: My daily smartwatch. No phone needed on rides.
- Garmin Fenix 9 Pro: I’ve just bought one.
On the bike
- Continental GP5000 for everyday riding, and Aero 111 on the front for special occasions.
- Helmets: Specialized S-Works Evade 3 for road riding, and Rudy Project Wing for TT-style races. I use both.
- Ravemen FR300: A front light that mounts under your Garmin or Wahoo. I use one.
- Wahoo TRACKR Radar: I use it on one bike and Varia on the other. They perform the same.
- Garmin Varia RTL515: Radar that warns you of cars from behind. I use this model.
- Wahoo ELEMNT Roam 3: The bike computer that’s easy to use. I use mine on most rides.
- Favero Assioma Pro RS2: Accurate power pedals that swap easily between bikes. I use this model.
Home and indoor training
- NPE Runn: Makes my basic treadmill smart, sending more accurate speed and distance to my watch and Zwift. I use it.
- Google Wifi: Keeps Zwift connected in my pain cave. I use it.
- Apple TV 4K: Zwift on the big screen. I use two.
- Google Nest Doorbell (wired, 2nd gen): My video doorbell, running in both Google Home and Apple Home. I use it.
Health, recovery and sleep
- FreeStyle Libre 3 Plus: Shows how my blood sugar responds to diet.
- hDrop: Measures my sweat loss in summer and indoors.
- Fourth Frontier Zone: Checks my heart under load in hard sessions.
- Oura Ring 5: My partner’s recovery tracker of choice.
- Eight Sleep: A cooling mattress cover my partner and I use nightly.
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