Apple Watch Ultra 2 vs Google Pixel Watch 4 45mm
Size, specs & wrist fit compared
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Which one fits you
On wrists narrower than about 52mm, the Google Pixel Watch 4 45mm is the safer pick — it stays proportionate down to roughly 47mm, where the Apple Watch Ultra 2 starts to hang over the edge. Above 52mm both sit cleanly, and the Apple Watch Ultra 2 gives you more presence.
The Google Pixel Watch 4 45mm wears larger than the Apple Watch Ultra 2 (45mm vs 44mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Google Pixel Watch 4 45mm is the slimmer of the two (12.3mm vs 14.4mm), so it slides under a cuff more easily.
On the wrist the Google Pixel Watch 4 45mm feels lighter (36.7g vs 61.3g, case only).
The Apple Watch Ultra 2 is thinner than 74% of the 44mm watches we track and the Google Pixel Watch 4 45mm than 71% of the 45mm ones — so both wear flatter than their widths suggest.
The Google Pixel Watch 4 45mm is 1mm wider, 4mm shorter, 2.1mm thinner and 24.6g lighter than the Apple Watch Ultra 2.
Apple
Watch Ultra 2
Pixel Watch 4 - 45mm
Switch or add watches
Apple
Watch Ultra 2
Pixel Watch 4 - 45mm
Watch Fit Tool
For sports watches, lug-to-lug (L2L) is what matters most — it decides whether a watch overhangs your wrist. Bulky is fine; overhang is not.
Measure at the point where you wear your watch — typically just below the wrist bone.
Flat width — lay your arm on a table, palm facing up, and measure straight across the top of your wrist with a ruler. Bone to bone; do not follow the curve down the sides.
Around — wrap a tape measure snugly round the wrist. No tape? Wrap a strip of paper, mark the overlap and hold the strip against a ruler.
Width ≠ circumference. They are different numbers — around 170mm is about 64mm across — so set the toggle to whichever one you actually measured before you type it in.
Apple Watch Ultra 2
Case 49.0mm · Lug-to-lug 49.0mm · Thickness 14.4mm · 61g
Sweet Spot
49mm on a 55mm wrist
Across the wrist it works — 3.0mm spare each side — but a tall watch on this wrist. Fine over a sleeve, awkward under one.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 49mm.
Measure where you wear it, just below the wrist bone. Either of these works — the tool converts between them.
- 1. Flat width — arm flat on a table, palm up. Measure straight across the top of the wrist, bone to bone, ignoring the curve down the sides.
- 2. Around — a tape, or a strip of paper marked and held against a ruler, snug the whole way round.
Leather: Attaches at the lugs, so the case back rests on your skin. Thins and softens with wear. Typical figures, not this model’s own.
Show the measurementsHide the measurements
- Across the wrist3.0mm spare each side
Fills the wrist without reaching the edge.
- Off the wrist14.4mm off the skin
A tall watch on this wrist. Fine over a sleeve, awkward under one. (14.4mm case, back against the skin)
- How it seats~7.3mm under the rim
Wide enough that the edge of the case back lifts clear of the skin.
- Weight on the wrist61g
Substantial without being a burden — the usual weight of a steel watch on a wrist this size. (1.1g per mm of wrist)
Google Pixel Watch 4 - 45mm
Case 45.0mm · Lug-to-lug 45.0mm · Thickness 12.3mm · 37g
Balanced Fit
45mm on a 55mm wrist
Comfortably inside the edges of your wrist, and it seats and sits low enough to wear without thinking about it.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 45mm, so you could go bigger.
Measure where you wear it, just below the wrist bone. Either of these works — the tool converts between them.
- 1. Flat width — arm flat on a table, palm up. Measure straight across the top of the wrist, bone to bone, ignoring the curve down the sides.
- 2. Around — a tape, or a strip of paper marked and held against a ruler, snug the whole way round.
Leather: Attaches at the lugs, so the case back rests on your skin. Thins and softens with wear. Typical figures, not this model’s own.
Show the measurementsHide the measurements
- Across the wrist5.0mm spare each side
Comfortable, with visible skin either side.
- Off the wrist12.3mm off the skin
Normal sports-watch height for a wrist this size. (12.3mm case, back against the skin)
- How it seats~5.2mm under the rim
Seats well, with the case back following most of the wrist.
- Weight on the wrist37g
Light enough to forget you have it on. (0.7g per mm of wrist)
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
- Apple Watch Ultra 244mm × 49mm · 14.4mm thick
- Google Pixel Watch 4 - 45mm45mm · 12.3mm thick
3D preview
Apple Watch Ultra 2 vs Google Pixel Watch 4 - 45mm on a wrist
Sized to your own wrist, turned any way you like.
Shapes are built from published measurements, not manufacturer 3D models — accurate proportions, generic dial.
Battery life compared
Runtime for every power mode either watch publishes, 2 of them directly comparable.
Apple Watch Ultra 2Google Pixel Watch 4 45mm
Battery Saver
72 hours72 hoursSmartwatch
1.5 days1.6 days
Specifications
The short version
11 key specs| Spec | AppleWatch Ultra 2 | GooglePixel Watch 4 - 45mm |
|---|---|---|
| Case Width | 44mm | 45mm |
| Lug-to-Lug | 49mm | 45mm |
| Thickness | 14.4mm | 12.3mm |
| Weight | 61.3g | 36.7g |
| Shape | Rectangle | Circular |
| Water Resistance | 10 ATM | 5 ATM |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Screen size | 1.92 inches | 1.4 inches |
| Battery life | 1.5 days | 1.6 days |
| Released | 2023 | 2025 |
Every specification
121 specs| Spec | Apple Watch Ultra 2 | Google Pixel Watch 4 - 45mm |
|---|---|---|
| Design | ||
| width | 44 | 45 |
| height | 49 | 45 |
| volume | 31.05 cm³ | 24.91 cm³ |
| weight | 61.3 g | 36.7 g |
| thickness | 14.4 | 12.3 |
| ATM rating | 10 ATM | 5 ATM |
| resolution | 410 x 502 px | 456 x 456 px |
| screen size | 1.92 inches | 1.4 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 338 ppi | 320 ppi |
| water resistance | Waterproof | Waterproof |
| Always-On Display | Yes | Yes |
| has a touch screen | Yes | Yes |
| is designed for kids | No | — |
| waterproof depth rating | 100 m | 50 m |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | Yes | No |
| maximum operating temperature | 55 °C | — |
| Ingress Protection (IP) rating | IPX6 | IP68 |
| has branded damage-resistant glass | No | Yes |
| lowest potential operating temperature | -20 °C | — |
| Gorilla Glass version | — | Gorilla Glass 5 |
| Battery | ||
| charge time | 1.5 hours | 1.25 hours |
| battery life | 1.5 days | 1.6 days |
| battery power | 564 mAh | 455 mAh |
| has wireless charging | Yes | No |
| has a removable battery | No | No |
| Has a solar power battery | No | No |
| has a rechargeable battery | Yes | Yes |
| battery life in power save mode | 72 hours | 72 hours |
| Sensors | ||
| has GPS | Yes | Yes |
| has a compass | Yes | Yes |
| Has a barometer | Yes | Yes |
| has a gyroscope | Yes | Yes |
| Has a cadence sensor | No | Yes |
| has an accelerometer | Yes | Yes |
| Monitors perspiration | No | No |
| Has a heart rate monitor | Yes | Yes |
| Has a temperature sensor | Yes | Yes |
| Monitors blood oxygenation levels | Yes | Yes |
| Features | ||
| RAM | 2GB | 2GB |
| release date | 2023-09-12 | 2025-08-20 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| warranty period | 1 years | 1 years |
| Has call control | Yes | Yes |
| Has silent alarm | Yes | Yes |
| has HRV tracking | Yes | Yes |
| internal storage | 64GB | 32GB |
| measures VO2 max | Yes | Yes |
| Has notifications | Yes | Yes |
| Has ECG technology | Yes | Yes |
| Locates your phone | Yes | Yes |
| has a front camera | No | — |
| has fall detection | Yes | Yes |
| has voice commands | Yes | Yes |
| Acquires GPS faster | Yes | No |
| Has vibrating alerts | Yes | Yes |
| number of microphones | 1 | — |
| Can be used to answer calls | Yes | Yes |
| measures resting heart rate | Yes | Yes |
| has irregular heart rate warnings | Yes | Yes |
| has fast/slow heart rate notifications | Yes | Yes |
| Has a built-in camera remote control function | Yes | Yes |
| shows readiness level | — | Yes |
| Connectivity | ||
| has NFC | Yes | Yes |
| SIM cards | 1 eSIM | 1 eSIM |
| Wi-Fi version | Wi-Fi 4 (802.11n) | Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax) |
| supports ANT+ | No | — |
| supports Wi-Fi | Yes | Yes |
| supports Galileo | Yes | Yes |
| Bluetooth version | 5.3 | 6 |
| has a cellular module | Yes | Yes |
| Is compatible with iOS | Yes | No |
| Is compatible with Android | No | Yes |
| Miscellaneous | ||
| has aptX | No | — |
| Has passcode | Yes | Yes |
| Has auto pause | Yes | — |
| Is compatible with Windows | No | No |
| Is compatible with Mac OS X | No | No |
| has an external memory slot | No | No |
| Compatible with smart scales | Yes | — |
| has a battery level indicator | Yes | Yes |
| has a socket for a 3.5 mm audio jack | No | No |
| Compatible with external heart rate monitors | Yes | — |
| App & Software | ||
| Ad-free | Yes | Yes |
| Free app | Yes | Yes |
| Has coaching | No | Yes |
| Includes maps | Yes | Yes |
| Supports routes | Yes | Yes |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has exercise diary | Yes | Yes |
| Predicts ovulation | Yes | Yes |
| Can be personalised | Yes | Yes |
| Has weight tracking | Yes | Yes |
| Predicts start date | Yes | Yes |
| Tracks water intake | Yes | Yes |
| Has inactivity alerts | Yes | Yes |
| Has period notifications | Yes | Yes |
| Has temperature tracking | Yes | Yes |
| Provides activity reports | Yes | Yes |
| Displays fertile window notifications | Yes | Yes |
| Counts how many calories you've burned | Yes | Yes |
| Has live tracking | — | Yes |
| Doesn’t require account | — | No |
| Activity tracking | ||
| Measures pace | Yes | Yes |
| Tracks distance | Yes | Yes |
| Tracks elevation | Yes | Yes |
| Designed for golf | No | No |
| Tracks your sleep | Yes | Yes |
| Tracks steps taken | Yes | Yes |
| Designed for diving | Yes | No |
| Has a route tracker | Yes | Yes |
| Has exercise tagging | Yes | Yes |
| Has multi-sport mode | Yes | No |
| Tracks calorie intake | No | Yes |
| Provides sleep reports | Yes | Yes |
| Detects activities automatically | Yes | Yes |
| Has a stroke counter for swimming | Yes | No |
Wrist Fit
Apple Watch Ultra 2
Sits best on wrists ~52–70mm wide (≈ 13.9–18.7cm circumference).
Google Pixel Watch 4 45mm
Sits best on wrists ~47–64mm wide (≈ 12.6–17.1cm circumference).
Frequently Asked Questions
Is the Apple Watch Ultra 2 bigger than the Google Pixel Watch 4 45mm?
The Google Pixel Watch 4 45mm is bigger — 45mm vs 44mm case width.
Which fits a smaller wrist better, the Apple Watch Ultra 2 or the Google Pixel Watch 4 45mm?
The Apple Watch Ultra 2 suits wrists around 52–70mm wide, and the Google Pixel Watch 4 45mm around 47–64mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Apple Watch Ultra 2 and Google Pixel Watch 4 45mm side by side at true scale?
Yes — the schematics and photos above show both watches at matched scale, and our fit tool overlays each on your wrist width.