Galaxy S21 Ultra vs OnePlus 9 Pro: Size & Dimensions Compared
The Galaxy S21 Ultra is the larger phone, measuring 1.9mm taller and 2.0mm wider.
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 (6.7") but body width differs by 2.0mm — verify bezel alignment before buying.
| Dimension | Galaxy S21 Ultra | OnePlus 9 Pro | Difference |
|---|---|---|---|
| Height | 165.1mm | 163.2mm | OnePlus 9 Pro -1.9mm (shorter) |
| Width | 75.6mm | 73.6mm | OnePlus 9 Pro -2.0mm (narrower) |
| Thickness | 8.9mm | 8.7mm | OnePlus 9 Pro -0.2mm (thinner) |
| Weight | 227g | 197g | OnePlus 9 Pro -30.0g (lighter) |
| Screen | 6.8" | 6.7" | OnePlus 9 Pro -0.1" (smaller) |
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 | Galaxy S21 Ultra | OnePlus 9 Pro |
|---|---|---|
| Wireless Charging | 15W | 10W |
| 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 Galaxy S21 Ultra to OnePlus 9 Pro?
Different sizes mean your old case probably won't fit. You'll need a new one.
Accessories for Galaxy S21 Ultra
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Frequently Asked Questions
Is Galaxy S21 Ultra bigger than OnePlus 9 Pro?
Yes, the Galaxy S21 Ultra is 1.9mm taller and 2.0mm wider. The Galaxy S21 Ultra weighs 227g vs 197g.
Are Galaxy S21 Ultra and OnePlus 9 Pro the same size?
No, the height differs by 1.9mm, width by 2.0mm, and thickness by 0.2mm.