When placed side by side, the iPhone 15 Plus and Apple Watch Ultra 3 reveal a clear story. In terms of height, the iPhone 15 Plus stands at 160.9 mm while the Apple Watch Ultra 3 measures 49.0 mm. The iPhone 15 Plus is 111.9 mm taller. Looking at width, the iPhone 15 Plus is 77.8 mm across versus the Apple Watch Ultra 3's 44.0 mm. The iPhone 15 Plus is 33.8 mm wider. For thickness, the iPhone 15 Plus comes in at 7.8 mm compared to the Apple Watch Ultra 3's 14.4 mm. The Apple Watch Ultra 3 is 6.6 mm thicker.
The iPhone 15 Plus is heavier at 201 grams versus 61.4 grams for the Apple Watch Ultra 3. That is a 139.6-gram difference (227.4%). While this may seem small, you can feel a noticeable difference during extended use.
Fits in most pockets, may feel snug when sitting.
Most of the screen is reachable, shifting grip needed for corners.
| Metric | iPhone 15 Plus | Apple Watch Ultra 3 | Diff |
|---|---|---|---|
| Width | 77.8 mm | 44.0 mm | +33.8 mm |
| Height | 160.9 mm | 49.0 mm | +111.9 mm |
| Depth | 7.8 mm | 14.4 mm | -6.6 mm |
| Weight | 201 g | 61.4 g | +139.6 mm |