Galaxy S21 Ultra vs Galaxy S25 FE: Size & Dimensions Compared
The Galaxy S21 Ultra is the larger phone, measuring 3.8mm taller and 1.0mm narrower.
Visual Size Overlay
- •Camera module layout is different — cutout won't align
Edge types differ (curved vs flat) — screen protector won't adhere properly.
| Dimension | Galaxy S21 Ultra | Galaxy S25 FE | Difference |
|---|---|---|---|
| Height | 165.1mm | 161.3mm | Galaxy S25 FE -3.8mm (shorter) |
| Width | 75.6mm | 76.6mm | Galaxy S25 FE +1.0mm (wider) |
| Thickness | 8.9mm | 7.4mm | Galaxy S25 FE -1.5mm (thinner) |
| Weight | 227g | 190g | Galaxy S25 FE -37.0g (lighter) |
| Screen | 6.8" | 6.7" | Galaxy S25 FE -0.1" (smaller) |
Visual Size Comparison
Button & Port Layout
Which is bigger?
The Galaxy S21 Ultra is the taller phone at 165.1mm (vs 161.3mm). It is also 37g 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 | Galaxy S25 FE |
|---|---|---|
| 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 Galaxy S21 Ultra to Galaxy S25 FE?
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 Galaxy S25 FE?
Yes, the Galaxy S21 Ultra is 3.8mm taller and 1.0mm narrower. The Galaxy S21 Ultra weighs 227g vs 190g.
Are Galaxy S21 Ultra and Galaxy S25 FE the same size?
No, the height differs by 3.8mm, width by 1.0mm, and thickness by 1.5mm.