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Xiaomi Redmi K40
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Phone Insight
Full Specifications October 20, 2026
Xiaomi Redmi K40 Android 11
Xiaomi · 2021

Xiaomi Redmi K40

Xiaomi Redmi K40 Android smartphone. Announced Feb 2021. Features 6.67″ display, Snapdragon 870 5G chipset, 4520 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 4520 mAh
OS Android 11, MIUI 12
Build 196g, 7.8mm thickness

Launch

Announced 2021, February 25
Status Available. Released 2021, March 04

Platform

OS Android 11, MIUI 12
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 Super AMOLED, 120Hz, HDR10+, 1300 nits (peak)
Size 6.67 inches, 107.4 cm 2 (~85.9% 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, 26mm (wide), 1/2.0", 0.8µm, PDAF 8 MP, f/2.2, 119˚ (ultrawide) 5 MP, f/2.4, 50mm (macro)
Features Color spectrum sensor, LED flash, HDR, panorama
Video 4K@30fps, 1080p@30/60/120/240/960fps, gyro-EIS

Selfie camera

Single 20 MP, f/2.5, (wide), 1/3.4", 0.8µm
Features HDR
Video 1080p@30fps, 720p@120fps

Body

Dimensions 163.7 x 76.4 x 7.8 mm (6.44 x 3.01 x 0.31 in)
Weight 196 g (6.91 oz)
SIM Nano-SIM + Nano-SIM

Battery

Type Li-Po 4520 mAh
Charging 33W wired, PD3.0, QC3, 100% in 52 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 5.1, A2DP, LE
Positioning GPS (L1+L5), GLONASS (G1), BDS (B1I+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC
NFC Yes
Infrared port 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, 7, 8, 18, 19, 26, 28, 34, 38, 39, 40, 41, 42
5G bands 1, 3, 28, 41, 77, 78 SA/NSA/Sub6
Speed HSPA, LTE, 5G

Features

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

Misc

Colors Black, White, Aurora
Models M2012K11AC
Phone Insight phoneinsight.org/ Printed October 20, 2026

For live pricing, photos, and comparisons, visit phoneinsight.org/phones/xiaomi-redmi-k40/

In depth

Full specifications

Announced 2021, February 25
Status Available. Released 2021, March 04
OS Android 11, MIUI 12
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 Super AMOLED, 120Hz, HDR10+, 1300 nits (peak)
Size 6.67 inches, 107.4 cm 2 (~85.9% 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, 26mm (wide), 1/2.0", 0.8µm, PDAF 8 MP, f/2.2, 119˚ (ultrawide) 5 MP, f/2.4, 50mm (macro)
Features Color spectrum sensor, LED flash, HDR, panorama
Video 4K@30fps, 1080p@30/60/120/240/960fps, gyro-EIS
Single 20 MP, f/2.5, (wide), 1/3.4", 0.8µm
Features HDR
Video 1080p@30fps, 720p@120fps
Dimensions 163.7 x 76.4 x 7.8 mm (6.44 x 3.01 x 0.31 in)
Weight 196 g (6.91 oz)
SIM Nano-SIM + Nano-SIM
Type Li-Po 4520 mAh
Charging 33W wired, PD3.0, QC3, 100% in 52 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 5.1, A2DP, LE
Positioning GPS (L1+L5), GLONASS (G1), BDS (B1I+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC
NFC Yes
Infrared port 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, 7, 8, 18, 19, 26, 28, 34, 38, 39, 40, 41, 42
5G bands 1, 3, 28, 41, 77, 78 SA/NSA/Sub6
Speed HSPA, LTE, 5G
Sensors Fingerprint (side-mounted), accelerometer, gyro, proximity, compass
Colors Black, White, Aurora
Models M2012K11AC
Price About 280 EUR
PhoneInsight Benchmark
73.5/100
Premium

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

Processor 72.4
Display 80.7
Camera 73.2
Battery 74.2
1.5%Popularity rank
2,492,257 hitsTotal views
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