84% SPEC SCORE
$281
The Redmi K40S comes with Android 12, ensuring enhanced functionality and smooth multitasking. It features a big 6.67-inches Crystal-clear Full HD+ display, perfect for both work and entertainment. Experience smooth transitions and quick responsive performance for everyday use. With a Good 4500 mAh battery life, you can stay powered throughout the day without frequent charging. Price starting at $281 this device is budget-friendly and it’s offers incredible value, blending performance, style, and affordability.
Redmi K40S Key Features
Display
6.67 inches (1080x2400 pixels) FHD
120Hz Refresh rate
Camera
48+8+2 MP (Triple Camera)
20 MP Selfie 4K Video
Hardware
Qualcomm SM8250-AC Snapdragon 870 5G (7 nm)
OS
Android 12
MIUI 13
Ram & Storage
6GB + 128GB
8GB + 128GB
Battery
Li-Po 4500mAh
wired, PD3.0, 67W, QC3, 100% in 38 min (advertised)
Data Updated on: 01 Oct, 2026
Redmi K40S Pros & Cons
By Amit Dubey | on 01 October, 2026
6.9
/ 10
TSI Score
Design
Display
Performance
Battery
Camera
Software
Sound
Usage
Pros
120Hz OLED-class spec at a low mid-range price.
Snapdragon 870 remains a credible chipset for the money.
Large 6.67-inch display suits video and gaming.
4500mAh battery is a sensible fit for the hardware.
Cons
No camera hardware details in the supplied specs.
No charging speed listed.
Base configuration is only 6GB/128GB.
No IP rating or wireless charging information supplied.
Redmi K40S Price and Full Specifications
Launch Date
| Announced Date | 17 Mar, 2022 |
| Released Date | 17 Mar, 2022 |
| Status | Available |
Network
| Technology | GSM / CDMA / HSPA / CDMA2000 / LTE / 5G |
| 2G bands | GSM 850 / 900 / 1800 / 1900 / CDMA 800 |
| 3G bands | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 / CDMA2000 1x |
| 4G bands | LTE |
| 5G bands | 5G |
| Speed | HSPA / LTE / 5G |
Display
| Screen Size | 6.67 inches, 107.4 cm² (~86.6% screen-to-body ratio) |
| Display Type | AMOLED |
| Resolution | 1080 × 2400 pixels (FHD) |
| Aspect Ratio | 20:9 |
| PPI | 395 ppi |
| Refresh Rate | 120Hz |
| Brightness | 1300 nits (peak) |
| HDR Support | HDR10+ |
| Protection | Corning Gorilla Glass 5 |
Performance
| Processor (SoC) | Qualcomm SM8250-AC Snapdragon 870 5G (7 nm) |
| Fabrication process | 7nm |
| CPU | Octa-core (1x3.2 GHz Kryo 585 & 3x2.42 GHz Kryo 585 & 4x1.80 GHz Kryo 585) |
| CPU cores | 8 |
| GPU | Adreno 650 |
Benchmarking
System Performance
Redmi K40S
Overall Score
...
AnTuTu
Geekbench 6 Single-Core
Storage
| Memory | 6GB + 128GB, 8GB + 128GB, 8GB + 256GB, 12GB + 256GB |
| Storage type | UFS 3.1 |
| Memory Card Slot | No |
Camera
REAR CAMERA | |
| Type | Triple camera |
| Primary | 48 MP, f/1.8, (wide), 1/2.0", 0.8µm, PDAF, OIS |
| Secondary | 8 MP, 119˚ (ultrawide) |
| Tertiary | 2 MP, f/2.4, (macro) |
| Features | Dual-LED dual-tone flash, HDR, panorama |
| Video Recording | 4K @30fps 1080p @30/60/120fps 720p @960fps gyro-EIS |
FRONT CAMERA | |
| Type | Single camera |
| Primary | 20 MP, (wide) |
| Video Recording | 1080p @30/120fps |
Battery
| Battery Capacity | Li-Po 4500mAh |
| Battery Removable | No |
| Charging | 67W wired (PD3.0, QC3) — 100% in 38 min (advertised) |
Software & OS
| Operating System | Android 12 |
| OS UI | MIUI 13 |
Design
| Dimensions | 163.2 x 76 x 7.7 mm (2.99 x 0.3 in) |
| Weight | 195g (6.88 oz) |
| Color Options | Black, Gray, Blue, Green |
| Water & Dust Resistance | Splash resistant |
| Build | Glass front (Gorilla Glass 5), plastic back |
| Sim Card Types | Dual SIM (Nano-SIM, dual stand-by) |
Connectivity
| WLAN | Wi-Fi 802.11 a/b/g/n/ac/6, Wi-Fi Direct |
| Bluetooth | 5.2, A2DP, LE |
| Positioning | GPS, GLONASS, BDS, GALILEO, QZSS, NavIC |
| NFC | Yes |
| Radio | No |
| Infrared-port | No |
| USB Version | USB Type-C 2.0, OTG |
Sound
| Loudspeaker | Yes, with stereo speakers |
| Sound Jack | No 3.5mm jack |
Sensors & Features
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass, color spectrum |
Additional Info
| Pricing | $281.35 / R$ 1.469.35 / ₹23,491 / £223.37 / €260 / C$400.84 |
What's in the Box
| Redmi K40S | Handset, USB-C cable, SIM ejector tool, and quick start guide |
Disclaimer: Information here may not be 100% accurate; please verify specs and prices on the retailer's website before buying. This page contains affiliate links. We may earn a commission if you make a purchase through them, at no extra cost to you. Thanks for your support!
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Frequently Asked Questions
How good is the Redmi K40?
The Redmi K40S is a strong mid-range performance phone, especially for buyers who want a fast display and a capable Snapdragon processor at a lower price. It uses the Qualcomm Snapdragon 870 5G chipset, paired here with 6GB of RAM and 128GB of storage, which is well suited for everyday use and gaming. Compared with the Redmi K40, search context highlights advantages for the Redmi K40S such as optical image stabilization, aptX support, and camera/microphone privacy features.
Is the Redmi K40 waterproof?
The Redmi K40S is not waterproof, and available data indicates it is not officially water-resistant. Buyers should not treat the Redmi K40S as safe for swimming, shower use, or accidental submersion. If water protection is a priority, an officially IP-rated phone would be a safer choice than relying on this model.
What is the disadvantage of a Redmi phone?
One disadvantage of some Redmi phones is that they may lack premium protections such as an official waterproof rating, as seen with the Redmi K40S. The Redmi K40S still offers strong value with a 6.67-inch 120Hz display, Snapdragon 870 5G processor, and 4500mAh battery at a mid-range price. Buyers should weigh those performance strengths against practical limitations like water exposure risk before choosing it.
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