If you swim, buy Apple Watch Series 12 from $399. It is the cheapest Apple Watch with a depth gauge and a water temperature sensor, and Apple rates it at 50 meters under ISO 22810:2010. Apple Watch SE 3 from $249 is swimproof to the same 50 meters but has neither of those sensors, and Apple Watch Ultra 4 from $799 is the only model Apple describes for snorkeling, scuba and high-speed water sports.
Apple publishes only a starting price for each of its three watches, so nothing below includes titanium, ceramic or cellular versions. Every rating quoted is Apple’s own wording from its spec, compare and store pages.
Key facts for a swimmer
| Figure | SE 3 from $249 | Series 12 from $399 | Ultra 4 from $799 |
|---|---|---|---|
| Water resistance | 50 m, swimproof | 50 m, swimproof, ISO 22810:2010 | 100 m, ISO 22810:2010 |
| Dive rating | None published | None published | EN13319, recreational scuba to 40 m |
| Depth gauge | Not listed | Yes, to 6 meters | Yes, accurate to within 1 meter |
| Water temperature sensor | Not listed | Yes | Yes |
| Dust rating | Not published | IP6X | IP6X |
| Peak brightness | 1000 nits | 2000 nits | 3000 nits |
| Battery, normal use | Up to 18 hours | Up to 24 hours | Up to 50 hours |
| Outdoor workout battery | Not published | Up to 10 hours | Up to 18 hours |
| Case | Aluminum, 40mm or 44mm | Aluminum, titanium or ceramic, 42mm or 46mm | Grade 5 titanium, 49mm |
Why Series 12 suits most swimmers
Series 12’s sensor list includes a depth gauge to 6 meters and a water temperature sensor, which is the line that separates it from the entry model. Apple pairs that with a 50 meter rating under ISO 22810:2010 and an IP6X dust rating, the S11 chip, and a Health Sensing System that reads heart rate every five seconds and heart rate variability as often as every five minutes.
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For pool work the numbers that matter are up to 24 hours of normal use, up to 10 hours of outdoor workout and a fast charge to 80 percent in about 30 minutes. The aluminum models get a Ceramic Shield 2 front that Apple says is 60 percent tougher than Ion-X glass, which is worth knowing if your watch shares a gym bag with everything else.
The catch is that 50 meters is a rating for swimming, not for depth sports. Apple does not publish a dive rating for the $399 watch, the depth gauge stops at 6 meters, and there are no satellite communications if your open water is out of cellular range.
SE 3 at $249 and the two sensors it skips
SE 3 is rated 50 meters and swimproof, so lap swimming is within Apple’s published envelope. It runs the S10 chip with 64GB of storage, comes in 40mm and 44mm aluminum at 26.3 g and 32.9 g for the GPS models, and is rated at up to 18 hours of normal use with 80 percent charge in about 45 minutes.
Two catches decide it. SE 3’s spec sheet lists no depth gauge and no water temperature sensor, and it also lists no electrical heart sensor or Blood Oxygen sensor, so ECG and Blood Oxygen are not part of the $249 watch. Its 1000 nit display is half the brightness of Series 12 and a third of Ultra 4, which is the sort of figure that matters in direct sun on open water. SE 3 briefly disappeared from Apple’s store before the September event and is listed again at From $249.
Ultra 4, snorkeling and scuba to 40 meters
Ultra 4 is the only Apple Watch Apple describes for swimming, snorkeling, scuba and high-speed water sports. Its 100 meter rating is under ISO 22810:2010, it carries EN13319 certification for recreational scuba to 40 meters with a depth gauge Apple says is accurate to within 1 meter, and Apple lists MIL-STD 810H testing and an IP6X dust rating. Battery is up to 50 hours of normal use, 84 hours in Low Power Mode and 18 hours of outdoor workout, with satellite communications that include two years on Ultra 3 and later. The new Ocean Band uses a silicone Apple describes as new, in translucent gray, kelp and black.
The catch is the wrist. From $799 buys a 49mm case that is 12mm deep and 63.0 g in natural titanium, against 39.5 g for a 46mm aluminum Series 12, and Apple lists a wrist range of 130 to 210mm. Apple has not published per-configuration or Hermes pricing.
What the water ratings actually say
| Apple’s wording | Where it appears | What it does not cover |
|---|---|---|
| 50 m, swimproof | SE 3 and Series 12 | Any dive rating, which Apple does not publish for either |
| 50 m under ISO 22810:2010 | Series 12 | Depth beyond the 6 meter depth gauge |
| 100 m under ISO 22810:2010 | Ultra 4 | Depth beyond the EN13319 limit of 40 meters |
| EN13319, recreational scuba to 40 m | Ultra 4 only | Technical or saturation diving |
| IP6X | Series 12 and Ultra 4 | Dust only, not water |
| IP57 | AirPods 5 and AirPods Pro 3 | Apple publishes no depth, duration or standard for it |
That last row is the one to read twice. Apple does not describe any AirPods as swimproof and gives IP57 with no depth, duration or test standard attached, while the watches carry a stated meter rating under a named standard. On the published evidence, AirPods 5 at $129 or $149 belong on the poolside bench rather than in the water, and the $149 Wireless Charging Case model is the one rated at five hours with noise cancelling on and 22 hours with the case, not the $129 model, which is four and 20.
What has not been confirmed
- Any dive rating for Series 12 or SE 3. Apple publishes none.
- SE 3’s outdoor-workout battery figure, and whether its sheet omits a depth gauge by design.
- Per-configuration prices for any of the three watches, or band prices.
- What IP57 means in depth or minutes for AirPods, which Apple does not state.
watchOS 27 ships free on Monday, September 14 for SE 3, Series 9 and later and Ultra 2 and later. Series 12 and Ultra 4 reach stores on Friday, September 18, and the full announcement is in our September 9 event recap.
