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- 12S Ultra vs Redmi K40S
Xiaomi 12S Ultra vs Xiaomi Redmi K40S
What 12S Ultra does better (17) and where Redmi K40S wins (4) — every spec side by side.
vs
8.5Display7.9
9.7Camera8.0
7.5Battery5.5
9.1Features6.9
Dimensions
Size comparison
12S UltraRedmi K40S
| 12S Ultra | Redmi K40S | Difference | |
|---|---|---|---|
| Height | 163.2 mm | 163.2 mm | = |
| Width | 75 mm | 76 mm | −1 mm |
| Thickness | 9.1 mm | 7.7 mm | +1.4 mm |
| Weight | 225 g | 195 g | +30 g |
Drawn to the same scale from the official dimensions (front and side).
Why is 12S Ultra better than Redmi K40S?
- Water resistance (IPx)IPx8 vs IPx32.7×
- Storage (max)512 GB vs 256 GB2×
- Telephoto cameraYes · Redmi K40S: No
- Wireless chargingYes · Redmi K40S: No
- Battery capacity4,860 mAh vs 4,500 mAh+8%
- Main camera50 MP vs 48 MP+4%
- Pixel density522 ppi vs 395 ppi+32%
- Storage (base)256 GB vs 128 GB2×
- Max video8K vs 4K
- 4K video frame rate60 fps vs 30 fps2×
- Peak brightness1,500 nits vs 1,300 nits+15%
- Process4 nm vs 7 nm+75%
Why is Redmi K40S better than 12S Ultra?
- Weight225 g vs 195 g+15%
- Thickness9.1 mm vs 7.7 mm+18%
- Charged in 30 min73% vs 79%+8%
- Main camera aperturef/1.9 vs f/1.8+6%
Specifications
Side by side
| Design | ||
| Weight | 225 g | 195 g |
| Thickness | 9.1 mm | 7.7 mm |
| Height | 163.2 mm | 163.2 mm |
| Width | 75 mm | 76 mm |
| Frame | Aluminium | — |
| Back | Eco leather | Plastic |
| Ingress protection | IP68 | IP53 |
| Water resistance (IPx) | IPx8 | IPx3 |
| Glass protection | Corning Gorilla Glass Victus | Corning Gorilla Glass 5 |
| Colours | Black, Dark Green | Black, Gray, Blue, Green |
| Display | ||
| Screen size | 6.7″ | 6.7″ |
| Panel | LTPO2 AMOLED | AMOLED |
| OLED panel | Yes | Yes |
| LTPO (adaptive 1–120 Hz) | Yes | — |
| Resolution (width) | 1,440 px | 1,080 px |
| Resolution (height) | 3,200 px | 2,400 px |
| Pixel density | 522 ppi | 395 ppi |
| Refresh rate | 120 Hz | 120 Hz |
| Peak brightness | 1,500 nits | 1,300 nits |
| Measured brightness | 1,065 nits | — |
| Screen-to-body ratio | 89% | 86.6% |
| HDR | Yes | Yes |
| Performance | ||
| Chipset | Qualcomm SM8475 Snapdragon 8+ Gen 1 | Qualcomm SM8250-AC Snapdragon 870 5G |
| Chip maker | Qualcomm | Qualcomm |
| Process | 4 nm | 7 nm |
| CPU cores | 8 | 8 |
| CPU frequency | 3.19 GHz | 3.2 GHz |
| GPU | Adreno 730 | Adreno 650 |
| AnTuTu score | 1,039,412 | — |
| Geekbench 6 (multi-core) | 4,300 | — |
| 3DMark Wild Life Extreme | 2,746 | — |
| Memory | ||
| RAM | 12 GB | 12 GB |
| Storage (max) | 512 GB | 256 GB |
| Storage (base) | 256 GB | 128 GB |
| Storage type | UFS 3.1 | UFS 3.1 |
| Memory card slot | No | No |
| Camera | ||
| Main camera | 50 MP | 48 MP |
| Main camera aperture | f/1.9 | f/1.8 |
| Main sensor size | 1" | 1/2.0" |
| Rear cameras | 3 | 2 |
| Optical stabilisation | Yes | Yes |
| Ultra-wide camera | Yes | Yes |
| Telephoto camera | Yes | No |
| Optical zoom | 5× | — |
| Max video | 8K | 4K |
| 4K video frame rate | 60 fps | 30 fps |
| Selfie camera | 32 MP | 20 MP |
| 4K selfie video | No | No |
| Battery | ||
| Battery capacity | 4,860 mAh | 4,500 mAh |
| Battery type | Li-Po | Li-Po |
| Wired charging | 67 W | 67 W |
| Charged in 30 min | 73% | 79% |
| Wireless charging | Yes | No |
| Wireless charging power | 50 W | — |
| Reverse wireless charging | Yes | — |
| Connectivity | ||
| 5G | Yes | Yes |
| eSIM | No | No |
| Dual SIM | Yes | Yes |
| Wi-Fi standard | Wi-Fi 6E | Wi-Fi 6 |
| Bluetooth | 5.2 | 5.2 |
| NFC | Yes | Yes |
| USB | USB Type-C 2.0 | USB Type-C 2.0 |
| USB version | 2 | 2 |
| Infrared port | Yes | — |
| Dual-band GPS | Yes | Yes |
| Satellite navigation | GLONASS, GALILEO, BDS, QZSS, NavIC | GLONASS, GALILEO, BDS, QZSS, NavIC |
| Features | ||
| Stereo speakers | Yes | Yes |
| 3.5 mm headphone jack | No | No |
| Loudspeaker loudness | -25.6 LUFS | — |
| Fingerprint sensor | Under display | Side |
| Barometer | Yes | — |
| Sensors | Fingerprint (under display, optical), accelerometer, gyro, compass, barometer | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass |
| Software | ||
| OS at launch | Android 12 | Android 12 |
| Platform | Android | Android |
| Interface | MIUI 13 | MIUI 13 |
