OnePlus 9 Pro vs Galaxy S21 Ultra: Size & Dimensions Compared
The Galaxy S21 Ultra is the larger phone, measuring 1.9mm shorter and 2.0mm narrower.
Visual Size Overlay
- •Height differs by 1.9mm — case won't fit
- •Width differs by 2.0mm — case won't fit
- •Thickness differs by 0.2mm — may affect fit
Same screen size (6.8") but body width differs by 2.0mm — verify bezel alignment before buying.
| Dimension | OnePlus 9 Pro | Galaxy S21 Ultra | Difference |
|---|---|---|---|
| Height | 163.2mm | 165.1mm | Galaxy S21 Ultra +1.9mm (taller) |
| Width | 73.6mm | 75.6mm | Galaxy S21 Ultra +2.0mm (wider) |
| Thickness | 8.7mm | 8.9mm | Galaxy S21 Ultra +0.2mm (thicker) |
| Weight | 197g | 227g | Galaxy S21 Ultra +30.0g (heavier) |
| Screen | 6.7" | 6.8" | Galaxy S21 Ultra +0.1" (larger) |
Visual Size Comparison
Button & Port Layout
Which is bigger?
The Galaxy S21 Ultra is the taller phone at 165.1mm (vs 163.2mm). It is also 30g heavier.
Wireless Charging & MagSafe Compatibility
Wireless chargers work with both phones, but magnetic snap varies.
- ✓Both devices support wireless charging. Standard Qi/Qi2 chargers work with either phone.
| Spec | OnePlus 9 Pro | Galaxy S21 Ultra |
|---|---|---|
| Wireless Charging | 10W | 15W |
| Qi Version | Qi | Qi |
| MagSafe | No | No |
| Built-in Magnets | No | No |
MagSafe cases are NOT cross-compatible between these devices — the case body is shaped to each phone, even though the internal magnet ring may be the same.
Upgrading from OnePlus 9 Pro to Galaxy S21 Ultra?
Different sizes mean your old case probably won't fit. You'll need a new one.
Accessories for OnePlus 9 Pro
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Frequently Asked Questions
Is OnePlus 9 Pro bigger than Galaxy S21 Ultra?
No, the Galaxy S21 Ultra is 1.9mm taller. The OnePlus 9 Pro weighs 197g vs 227g.
Are OnePlus 9 Pro and Galaxy S21 Ultra the same size?
No, the height differs by 1.9mm, width by 2.0mm, and thickness by 0.2mm.