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Xiaomi Redmi K40S
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Phone Insight
Full Specifications October 20, 2026
Xiaomi Redmi K40S Android 12
Xiaomi · 2022

Xiaomi Redmi K40S

Xiaomi Redmi K40S Android smartphone. Announced Mar 2022. Features 6.67″ display, Snapdragon 870 5G chipset, 4500 mAh battery, 256 GB storage, 12 GB RAM, Corning Gorilla Glass 5.

Display 6.67"
Chipset Snapdragon 870 5G
RAM 6-12 GB
Storage 128GB/256GB storage, no card slot
Camera 48 MP
Battery 4500 mAh
OS Android 12, MIUI 13
Build 195g, 7.7mm thickness

Launch

Announced 2022, March 17
Status Available. Released 2022, March 17

Platform

OS Android 12, MIUI 13
Chipset Qualcomm SM8250-AC Snapdragon 870 5G (7 nm)
CPU Octa-core (1x3.2 GHz Kryo 585 & 3x2.42 GHz Kryo 585 & 4x1.80 GHz Kryo 585)
GPU Adreno 650

Display

Type AMOLED, 120Hz, HDR10+, 1300 nits (peak)
Size 6.67 inches, 107.4 cm 2 (~86.6% screen-to-body ratio)
Resolution 1080 x 2400 pixels, 20:9 ratio (~395 ppi density)
Protection Corning Gorilla Glass 5

Memory

Card slot No
Internal 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM
memoryother UFS 3.1

Main Camera

Triple 48 MP, f/1.8, (wide), 1/2.0", 0.8µm, PDAF, OIS 8 MP, 119˚ (ultrawide) 2 MP (macro)
Features Color spectrum sensor, Dual-LED dual-tone flash, HDR, panorama
Video 4K@30fps, 1080p@30/60/120fps, 720p@960fps; gyro-EIS

Selfie camera

Single 20 MP, (wide)
Video 1080p@30/120fps

Body

Dimensions 163.2 x 76 x 7.7 mm (6.43 x 2.99 x 0.30 in)
Weight 195 g (6.88 oz)
Build Glass front (Gorilla Glass 5), plastic back
SIM Nano-SIM + Nano-SIM
bodyother Splash resistant

Battery

Type Li-Po 4500 mAh
Charging 67W wired, PD3.0, QC3, 100% in 38 min

Sound

Loudspeaker Yes, with stereo speakers
3.5mm jack No
optionalother 24-bit/192kHz Hi-Res audio

Comms

WLAN Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct
Bluetooth 5.2, A2DP, LE
Positioning GPS (L1+L5), GLONASS (L1), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5)
NFC Yes
Radio No
USB USB Type-C 2.0, OTG

Network

Technology GSM / CDMA / HSPA / CDMA2000 / LTE / 5G
2G bands GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands 1, 2, 3, 4, 5, 8, 18, 19, 26, 34, 38, 39, 40, 41, 42
5G bands 1, 3, 5, 8, 28, 38, 40, 41, 77, 78 SA/NSA
Speed HSPA, LTE, 5G

Features

Sensors Fingerprint (side-mounted), accelerometer, gyro, proximity, compass

Misc

Colors Black, Gray, Blue, Green
Phone Insight phoneinsight.org/ Printed October 20, 2026

For live pricing, photos, and comparisons, visit phoneinsight.org/phones/xiaomi-redmi-k40s/

In depth

Full specifications

Announced 2022, March 17
Status Available. Released 2022, March 17
OS Android 12, MIUI 13
Chipset Qualcomm SM8250-AC Snapdragon 870 5G (7 nm)
CPU Octa-core (1x3.2 GHz Kryo 585 & 3x2.42 GHz Kryo 585 & 4x1.80 GHz Kryo 585)
GPU Adreno 650
Type AMOLED, 120Hz, HDR10+, 1300 nits (peak)
Size 6.67 inches, 107.4 cm 2 (~86.6% screen-to-body ratio)
Resolution 1080 x 2400 pixels, 20:9 ratio (~395 ppi density)
Protection Corning Gorilla Glass 5
Card slot No
Internal 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM
memoryother UFS 3.1
Triple 48 MP, f/1.8, (wide), 1/2.0", 0.8µm, PDAF, OIS 8 MP, 119˚ (ultrawide) 2 MP (macro)
Features Color spectrum sensor, Dual-LED dual-tone flash, HDR, panorama
Video 4K@30fps, 1080p@30/60/120fps, 720p@960fps; gyro-EIS
Single 20 MP, (wide)
Video 1080p@30/120fps
Dimensions 163.2 x 76 x 7.7 mm (6.43 x 2.99 x 0.30 in)
Weight 195 g (6.88 oz)
Build Glass front (Gorilla Glass 5), plastic back
SIM Nano-SIM + Nano-SIM
bodyother Splash resistant
Type Li-Po 4500 mAh
Charging 67W wired, PD3.0, QC3, 100% in 38 min
Loudspeaker Yes, with stereo speakers
3.5mm jack No
optionalother 24-bit/192kHz Hi-Res audio
WLAN Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct
Bluetooth 5.2, A2DP, LE
Positioning GPS (L1+L5), GLONASS (L1), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5)
NFC Yes
Radio No
USB USB Type-C 2.0, OTG
Technology GSM / CDMA / HSPA / CDMA2000 / LTE / 5G
2G bands GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands 1, 2, 3, 4, 5, 8, 18, 19, 26, 34, 38, 39, 40, 41, 42
5G bands 1, 3, 5, 8, 28, 38, 40, 41, 77, 78 SA/NSA
Speed HSPA, LTE, 5G
Sensors Fingerprint (side-mounted), accelerometer, gyro, proximity, compass
Colors Black, Gray, Blue, Green
Price About 260 EUR
PhoneInsight Benchmark
74.7/100
Premium

A specs-derived composite score, not a lab benchmark -- useful for ranking and comparison.

Processor 72.4
Display 80.7
Camera 79.2
Battery 79.9
0.3%Popularity rank
660,345 hitsTotal views
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