OnePlus 13 vs Galaxy S21 Ultra: Size & Dimensions Compared
The Galaxy S21 Ultra is the larger phone, measuring 2.2mm shorter and 0.9mm wider.
Visual Size Overlay
- •Camera module layout is different — cutout won't align
Edge types differ (flat vs curved) — screen protector won't adhere properly.
| Dimension | OnePlus 13 | Galaxy S21 Ultra | Difference |
|---|---|---|---|
| Height | 162.9mm | 165.1mm | Galaxy S21 Ultra +2.2mm (taller) |
| Width | 76.5mm | 75.6mm | Galaxy S21 Ultra -0.9mm (narrower) |
| Thickness | 8.5mm | 8.9mm | Galaxy S21 Ultra +0.4mm (thicker) |
| Weight | 213g | 227g | Galaxy S21 Ultra +14.0g (heavier) |
| Screen | 6.82" | 6.8" | Same |
Visual Size Comparison
Button & Port Layout
Which is bigger?
The Galaxy S21 Ultra is the taller phone at 165.1mm (vs 162.9mm). It is also 14g 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 13 | Galaxy S21 Ultra |
|---|---|---|
| Wireless Charging | 15W | 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 13 to Galaxy S21 Ultra?
Different sizes mean your old case probably won't fit. You'll need a new one.
Accessories for OnePlus 13
Spigen
Spigen Ultra Hybrid for OnePlus 13
$15.99
Ringke
Ringke Fusion-X MagSafe for OnePlus 13
$23.99
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Frequently Asked Questions
Is OnePlus 13 bigger than Galaxy S21 Ultra?
No, the Galaxy S21 Ultra is 2.2mm taller. The OnePlus 13 weighs 213g vs 227g.
Are OnePlus 13 and Galaxy S21 Ultra the same size?
No, the height differs by 2.2mm, width by 0.9mm, and thickness by 0.4mm.