OVERALL
ALTERNATIVES
SPECS
VS AVERAGE
REVIEWS
Scored using Smartphones Methodology v1.0
Smartphones Methodology v1.0
Mathematical & Unbiased Scoring
Products in this category are evaluated mathematically under Frontumo Smartphones Methodology v1.0 using verified laboratory benchmarks, technical specifications, and authentic consumer ratings with 0% commercial bias.
Explore Smartphones Methodology v1.0

Xiaomi Redmi K40 (12GB + 256GB) Review | 197 Data compared

Avg. price:~£230RAM capacity:12 GBInternal storage:256 GBScreen size:6.67 inchesMain camera megapixels:48 MP & 8 MP & 5 MP

Xiaomi Redmi K40 (12GB + 256GB) Review: Compare 197 technical specifications and user reviews to see how this product ranks in the Smartphones category and whether it is worth buying.

6.8

Overall score

Score
6.8/ 10
✕
What it is
An overall evaluation of the smartphone's quality, based on technical analyses and user reviews.
When it matters
When you need a quick reference to identify the best smartphones on the market.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 54% of models
Score components

90%

6.6

Technical score

10%

8.2

User score

â–²Better than 54% of smartphones
6.6

Technical score

Technical score
6.6/ 10
✕
What it is
An assessment of the smartphone's technical performance, covering eight key areas: performance & hardware, software, camera, connectivity, display, battery, audio, and design.
When it matters
When you want to compare smartphones based on technical performance and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 51% of models
Score components

25%

7.0

Performance & Hardware

18%

6.3

Camera

15%

7.0

Display

15%

5.4

Battery

10%

7.0

Software

10%

7.5

Connectivity

4%

5.9

Audio

3%

5.9

Design

â–²Better than 51% of smartphones
8.2

User score

User score
8.2/ 10
✕
What it is
A rating that combines user reviews and the total number of reviews received by the smartphone
When it matters
When you want to know how a smartphone handles daily tasks and how reliable it remains over time according to user feedback.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 72% of models
Score components

70%

8.8

User ratings

30%

6.9

Number of reviews

Based on 490 buyer reviews from online shops.
Read buyer reviews on Amazon →
How we calculate this
User ratings – average star rating across all shop listings, weighted by how many reviews each has, on a 1–10 scale.
Number of reviews – how many buyer reviews the product has, on a logarithmic scale; the 8% most-reviewed models in the category get 10.
â–²Better than 72% of smartphones
  • xiaomi-redmi-k40
  • xiaomi-redmi-k40
  • xiaomi-redmi-k40
  • xiaomi-redmi-k40
  • xiaomi-redmi-k40
xiaomi-redmi-k40
xiaomi-redmi-k40
xiaomi-redmi-k40
xiaomi-redmi-k40
xiaomi-redmi-k40

Best prices

*As an Amazon Associate, we earn from qualifying purchases.

Best rankings

Available: ranking among products currently available (including other versions of this product).All: ranking among all products in the database.
Loading category ranking...

Technical Specifications of smartphone Xiaomi Redmi K40 (12GB + 256GB)

Technical score
Technical score
6.6/ 10
✕
What it is
An assessment of the smartphone's technical performance, covering eight key areas: performance & hardware, software, camera, connectivity, display, battery, audio, and design.
When it matters
When you want to compare smartphones based on technical performance and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 51% of models
Score components:

25%

7.0

Performance & Hardware

18%

6.3

Camera

15%

7.0

Display

15%

5.4

Battery

10%

7.0

Software

10%

7.5

Connectivity

4%

5.9

Audio

3%

5.9

Design

6.6
User score
User score
8.2/ 10
✕
What it is
A rating that combines user reviews and the total number of reviews received by the smartphone
When it matters
When you want to know how a smartphone handles daily tasks and how reliable it remains over time according to user feedback.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 72% of models
Score components

70%

8.8

User ratings

30%

6.9

Number of reviews

Based on 490 buyer reviews from online shops.
Read buyer reviews on Amazon →
How we calculate this
User ratings – average star rating across all shop listings, weighted by how many reviews each has, on a 1–10 scale.
Number of reviews – how many buyer reviews the product has, on a logarithmic scale; the 8% most-reviewed models in the category get 10.
8.2
Popularity
Popularity
6.9/ 10
✕
What it is
An indicator based on the number of reviews received by the smartphone.
When it matters
When you prefer to purchase a product chosen and reviewed by many other consumers.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 64% of models
Popularity:
Xiaomi Redmi K40 (12GB + 256GB) has a popularity of 6.9 points, which is higher than 64% of smartphones.
6.9
Value for money
Value for money
7.5/ 10
✕
What it is
An indicator that combines the smartphone's overall rating with its cost.
When it matters
When you are looking for a smartphone with a good balance between quality and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 58% of models
Score components:

60%

6.8

Overall score

40%

9.3

Price

7.5
Brand name
Xiaomi
Processor model
Qualcomm Snapdragon 870
Processor model
Qualcomm Snapdragon 870
â–² Better than 72% of models
This smartphone uses the Qualcomm Snapdragon 870 processor which is faster than processors in 72.4% of smartphones and equal to processors in 1.3% of smartphones.
RAM capacity
12 GB
RAM capacity
12 GB
â–² Better than 59% of models
Market range: <4 GB – >16 GB
This smartphone has a RAM capacity of 12 GB which is larger than the RAM capacity of 59% of smartphones and equal to that of 24.3% of smartphones.
Internal storage
256 GB
Internal storage
256 GB
â–² Better than 39% of models
Market range: <64 GB – >512 GB
This smartphone has an internal storage capacity of 256 GB which is larger than the storage of 38.8% of smartphones and equal to that of 38.3% of smartphones.
CPU boost clock speed
3.2 GHz
CPU boost clock speed
3.2 GHz
â–² Better than 81% of models
Market range: <2 GHz – >3.3 GHz
The CPU boost clock speed of this smartphone is 3.2 GHz which is higher than the boost speed of 81.3% of smartphones and equal to that of 7.1% of smartphones.
Show more
Operating system
Android
Operating system
Android
â–² Better than 1% of models
This smartphone uses the Android operating system, which outperforms that of 1%.
Android 11
Android version
Android 11
Android version
Android 11
â–¼ Worse than 80% of models
This smartphone runs Android version Android 11 which is older than that found in 80.3% of smartphones and equal to that in 8.5% of smartphones.
Direct OS updates
no
Direct OS updates
no
â–¼ Worse than 21% of models
This smartphone does not receive direct OS updates. 20.6% of smartphones receive direct updates.
Open-source OS
yes
Open-source OS
yes
â–² Better than 5% of models
This smartphone uses an open-source OS. 94.6% of smartphones use an open-source OS.
Dark mode
yes
Dark mode
yes
â–² Better than 4% of models
This smartphone offers dark mode. 95.8% of smartphones support this feature.
Show more
Multi-lens main camera
yes
Multi-lens main camera
yes
â–² Better than 6% of models
This smartphone includes a multi-lens main camera system. 93.7% of smartphones include multi-lens setups.
Main camera megapixels
48 MP & 8 MP & 5 MP
Main camera megapixels
48 MP & 8 MP & 5 MP
â–¼ Worse than 79% of models
Market range: <10 – >100
This smartphone has a main camera resolution of 48 MP & 8 MP & 5 MP which is lower than that of 78.7% of smartphones and equal to that of 0.4% of smartphones.
Main camera aperture
?
Main camera sensor area
30.7 mm²
Main camera sensor area
30.7 mm²
â–¼ Worse than 63% of models
Market range: <19.7 mm² – >71.4 mm²
This smartphone has a main camera sensor area of 30.7 mm² which is smaller than the main camera sensor area of 63.5% of smartphones and equal to that of 6.3% of smartphones.
Main camera pixel size
0.8 µm
Main camera pixel size
0.8 µm
â–¼ Worse than 43% of models
Market range: <0.64 µm – >1.22 µm
This smartphone has a main camera pixel size of 0.8 µm which is larger than in 35.5% of smartphones and equal to the size in 21.9% of smartphones.
Show more
Number of SIM slots
2
Number of SIM slots
2
â–² Better than 4% of models
Market range: <1 – >6
This smartphone has 2 SIM slots, which is more than in 3.8% of smartphones and equal to the number in 96.1% of smartphones.
Cellular module
yes
Cellular module
yes
Category Benchmark
This smartphone includes a cellular module. 100% of smartphones include cellular modules.
5G connectivity
yes
5G connectivity
yes
â–² Better than 33% of models
This smartphone supports 5G connectivity. 66.9% of smartphones support 5G.
LTE support
yes
LTE support
yes
Category Benchmark
This smartphone supports LTE. 99.7% of smartphones include LTE connectivity.
Wi-Fi connectivity
yes
Wi-Fi connectivity
yes
Category Benchmark
This smartphone supports Wi-Fi connectivity. 100% of smartphones offer Wi-Fi support.
Show more
Screen size
6.67 inches
Screen size
6.67 inches
â–¼ Worse than 48% of models
Market range: <6.3 inches – >6.82 inches
This smartphone has a screen size of 6.67 inches which is larger than the screens of 38.3% of smartphones and equal to those of 13.4% of smartphones.
Screen resolution
1080x 2400 px
Screen resolution
1080x 2400 px
â–¼ Worse than 43% of models
This smartphone has a screen resolution of 1080x2400 px which is higher than that of 36.3% of smartphones and equal to that of 20.4% of smartphones.
Pixel density
395 ppi
Pixel density
395 ppi
â–¼ Worse than 49% of models
Market range: <264 ppi – >460 ppi
This smartphone has a pixel density of 395 ppi which is higher than that of 41.7% of smartphones and equal to that of 8.9% of smartphones.
Display type
OLED/AMOLED
Display type
OLED/AMOLED
â–² Better than 41% of models
This smartphone uses a OLED/AMOLED display type. 58.6% of smartphones use this display technology.
Refresh rate
120 Hz
Refresh rate
120 Hz
â–² Better than 35% of models
Market range: <60 Hz – >144 Hz
This smartphone supports a refresh rate of 120 Hz which is higher than in 34.7% of smartphones and equal to that in 55.2% of smartphones.
Show more
Battery capacity
4,520 mAh
Battery capacity
4,520 mAh
â–¼ Worse than 78% of models
Market range: <4k mAh – >7k mAh
This smartphone has a battery capacity of 4,520 mAh which is smaller than the batteries in 77.9% of smartphones and equal to those in 0.4% of smartphones.
Charging speed
33 W
Charging speed
33 W
â–¼ Worse than 49% of models
Market range: <15 W – >90 W
This smartphone supports charging speeds of 33 W which is faster than in 38.9% of smartphones and equal to speeds in 12% of smartphones.
Fast charging
yes
Fast charging
yes
â–² Better than 7% of models
This smartphone supports fast charging. 93.1% of smartphones support fast charging.
GSMArena full wired charge time
52 min
GSMArena full wired charge time
52 min
â–² Better than 64% of models
Market range: <36 min – >120 min
This smartphone reaches a full wired charge in 52 min which is faster than 63.9% of smartphones and equal to the time of 3.1% of smartphones.
Wireless charging
no
Wireless charging
no
â–¼ Worse than 25% of models
This smartphone does not support wireless charging. 25.2% of smartphones support wireless charging.
Show more
Stereo speakers
yes
Stereo speakers
yes
â–² Better than 36% of models
This smartphone includes stereo speakers. 64.4% of smartphones provide stereo audio.
3.5 mm headphone jack
no
3.5 mm headphone jack
no
â–¼ Worse than 45% of models
This smartphone does not include a 3.5 mm headphone jack. 45.5% of smartphones offer this port.
Number of microphones
?
FM radio
no
FM radio
no
â–¼ Worse than 34% of models
This smartphone does not include an FM radio. 34.2% of smartphones offer FM radio functionality.
aptX Lossless
no
aptX Lossless
no
â–¼ Worse than 13% of models
This smartphone does not support aptX Lossless. 12.9% of smartphones provide aptX Lossless.
Show more
Height
163.7 mm
Height
163.7 mm
â–¼ Worse than 52% of models
Market range: <156.2 mm – >171.56 mm
This smartphone has a height of 163.7 mm which is taller than 51.6% of smartphones and equal to that of 1.9% of smartphones.
Width
76.4 mm
Width
76.4 mm
â–¼ Worse than 61% of models
Market range: <73.1 mm – >81 mm
This smartphone has a width of 76.4 mm which is wider than 60.7% of smartphones and equal to that of 2.2% of smartphones.
Thickness
7.8 mm
Thickness
7.8 mm
â–² Better than 77% of models
Market range: <7.53 mm – >10.5 mm
This smartphone has a thickness of 7.8 mm which is thinner than 77.4% of smartphones and equal to that of 4.2% of smartphones.
Weight
196 g
Weight
196 g
â–² Better than 50% of models
Market range: <175 g – >256 g
This smartphone weighs 196 g which is lighter than 50.1% of smartphones and equal to the weight of 2.3% of smartphones.
Device volume
86,716 cm³
Device volume
86,716 cm³
â–² Better than 76% of models
Market range: <80 cm³ – >190 cm³
This smartphone has a device volume of 86,716 cm³ which is smaller than 76.5% of smartphones and equal to that of 1.7% of smartphones.
Show more

Xiaomi Redmi K40 (12GB + 256GB) vs the average smartphone

246810TotalPerformance & HardwareSoftwareCameraConnectivityDisplayBatteryAudioDesign
  • 33.3% higher CPU boost clock speed
    CPU boost clock speed
    3.2 GHz
    â–² Better than 81% of models
    Market range: <2 GHz – >3.3 GHz
    This smartphone has a higher CPU boost clock speed than the average smartphone (3.2 GHz vs 2.4 GHz). The average smartphone has a boost clock speed of 2.4 GHz.
    3.2 GHz vs 2.4 GHz
  • 66.7% lower TDP
    TDP (Thermal design power)
    10 W
    â–² Better than 82% of models
    Market range: <4 W – >10 W
    This smartphone has a lower TDP than the average smartphone (10 W vs 6 W). The average TDP for smartphones is 6 W.
    10 W vs 6 W
  • 4 GB more RAM
    RAM capacity
    12 GB
    â–² Better than 59% of models
    Market range: <4 GB – >16 GB
    This smartphone has more RAM capacity than the average smartphone (12 GB vs 8 GB). The average smartphone has 8 GB of RAM.
    12 GB vs 8 GB
  • Higher CPU base clock speed
    CPU base clock speed
    1 x 3.2 GHz & 3 x 2.42 GHz & 4 x 1.8 GHz
    â–² Better than 81% of models
    This smartphone has a higher CPU base clock speed than the average smartphone (1x3.2 GHz & 3x2.42 GHz & 4x1.8 GHz vs 2x2.2 GHz & 6x2 GHz). The average smartphone has a base clock speed of 2x2.2 GHz & 6x2 GHz.
    1x3.2 GHz & 3x2.42 GHz & 4x1.8 GHz vs 2x2.2 GHz & 6x2 GHz
  • 6 more memory channels
    Memory channels
    8
    ★ Better than 98% of models
    Market range: <2 – >4
    This smartphone has more memory channels than the average smartphone (8 vs 2). The average smartphone has 2 memory channels.
    8 vs 2
  • Newer DDR memory version
    DDR memory version
    5
    â–² Better than 52% of models
    This smartphone supports a newer DDR version than the average smartphone (5 vs 4). The average DDR version is 4.
    5 vs 4
  • Higher contrast ratio
    Contrast ratio
    5000000:1
    â–² Better than 79% of models
    This smartphone has a higher contrast ratio than the average smartphone (5000000:1 vs 1000000:1). The average smartphone contrast ratio is 1000000:1.
    AMOLED/OLED displays have an effectively infinite contrast ratio
    5,000,000:1 vs 1,000,000:1
  • 50% higher touch sampling rate
    Touch sampling rate
    360 Hz
    â–² Better than 78% of models
    Market range: <120 Hz – >480 Hz
    This smartphone has a higher touch sampling rate than the average smartphone (360 Hz vs 240 Hz). The average touch sampling rate is 240 Hz.
    360 Hz vs 240 Hz
  • 2.9% higher user score
    User score
    8.2/ 10
    ✕
    What it is
    A rating that combines user reviews and the total number of reviews received by the smartphone
    When it matters
    When you want to know how a smartphone handles daily tasks and how reliable it remains over time according to user feedback.
    Score distribution
    â–¼
    â–¼
    <55-66-77-88-99-10
    Xiaomi Redmi K40
    the average smartphone
    Xiaomi Redmi K40 (12GB + 256GB) has a higher user score than the average smartphone (8.23 vs 8.000).
    8.23 vs 8
  • 33.3% higher CPU boost clock speed
    CPU boost clock speed
    3.2 GHz
    â–² Better than 81% of models
    Market range: <2 GHz – >3.3 GHz
    This smartphone has a higher CPU boost clock speed than the average smartphone (3.2 GHz vs 2.4 GHz). The average smartphone has a boost clock speed of 2.4 GHz.
    3.2 GHz vs 2.4 GHz
  • 66.7% lower TDP
    TDP (Thermal design power)
    10 W
    â–² Better than 82% of models
    Market range: <4 W – >10 W
    This smartphone has a lower TDP than the average smartphone (10 W vs 6 W). The average TDP for smartphones is 6 W.
    10 W vs 6 W
  • 4 GB more RAM
    RAM capacity
    12 GB
    â–² Better than 59% of models
    Market range: <4 GB – >16 GB
    This smartphone has more RAM capacity than the average smartphone (12 GB vs 8 GB). The average smartphone has 8 GB of RAM.
    12 GB vs 8 GB
  • Higher CPU base clock speed
    CPU base clock speed
    1 x 3.2 GHz & 3 x 2.42 GHz & 4 x 1.8 GHz
    â–² Better than 81% of models
    This smartphone has a higher CPU base clock speed than the average smartphone (1x3.2 GHz & 3x2.42 GHz & 4x1.8 GHz vs 2x2.2 GHz & 6x2 GHz). The average smartphone has a base clock speed of 2x2.2 GHz & 6x2 GHz.
    1x3.2 GHz & 3x2.42 GHz & 4x1.8 GHz vs 2x2.2 GHz & 6x2 GHz
  • 6 more memory channels
    Memory channels
    8
    ★ Better than 98% of models
    Market range: <2 – >4
    This smartphone has more memory channels than the average smartphone (8 vs 2). The average smartphone has 2 memory channels.
    8 vs 2
  • Newer DDR memory version
    DDR memory version
    5
    â–² Better than 52% of models
    This smartphone supports a newer DDR version than the average smartphone (5 vs 4). The average DDR version is 4.
    5 vs 4
  • 71.9% higher memory bandwidth
    Memory bandwidth
    44 GB/s
    â–² Better than 66% of models
    Market range: <13.41 GB/s – >76.6 GB/s
    This smartphone has higher memory bandwidth than the average smartphone (44 GB/s vs 25.6 GB/s). The average memory bandwidth is 25.6 GB/s.
    44 GB/s vs 25.6 GB/s
  • 24.3% higher Geekbench 6 single-core benchmark score
    Geekbench 6 single-core benchmark score
    1,171
    â–² Better than 70% of models
    Market range: <392 – >2.2k
    This smartphone scores better in Geekbench 6 single-core than the average smartphone (1,171 vs 942). The average smartphone scores 942 in single-core.
    1,171 vs 942
  • 31.7% higher Geekbench 6 multi-core benchmark score
    Geekbench 6 multi-core benchmark score
    3,337
    â–² Better than 70% of models
    Market range: <1.4k – >6.7k
    This smartphone scores better in Geekbench 6 multi-core than the average smartphone (3,337 vs 2,533). The average smartphone scores 2,533 in multi-core.
    approximate average of various user-submitted scores
    3,337 vs 2,533
  • 14.3% higher maximum RAM
    Maximum RAM
    16 GB
    â–² Better than 53% of models
    Market range: <8 GB – >16 GB
    This smartphone supports more maximum RAM than the average smartphone (16 GB vs 14 GB). The average smartphone supports 14 GB RAM.
    16 GB vs 14 GB
  • 37.4% higher 3DMark Wild Life benchmark
    3DMark Wild Life benchmark
    4,279
    â–² Better than 63% of models
    Market range: <661 – >11.1k
    This smartphone scores higher in 3DMark Wild Life than the average smartphone (4,279 vs 3,115). The average smartphone scores 3,115.
    4,279 vs 3,115
  • Better processor
    Processor model
    Qualcomm Snapdragon 870
    â–² Better than 72% of models
    This smartphone features a better processor than the average smartphone (Qualcomm Snapdragon 870 vs Qualcomm Snapdragon 7 Gen 3).
    Qualcomm Snapdragon 870 vs Qualcomm Snapdragon 7 Gen 3
  • 50% more shader units
    N. of shading units
    384
    â–² Better than 59% of models
    Market range: <32 – >1.5k
    This smartphone features more shader units than the average smartphone (384 vs 256). The average smartphone has 256 shader units.
    384 vs 256
  • Has a front LED flash
    Front LED flash
    yes
    ★ Better than 92% of models
    This smartphone features a front-facing LED flash, the average smartphone does not. 7.8% of smartphones include a front flash.
  • Supports laser autofocus
    Laser autofocus
    yes
    â–² Better than 79% of models
    This smartphone features laser autofocus, the average smartphone does not. 21.4% of smartphones include laser AF.
  • 1 more flash LEDs
    Number of flash LEDs
    2
    â–² Better than 56% of models
    Market range: <1 – >2
    This smartphone has more flash LEDs than the average smartphone (2 vs 1). The average smartphone has 1 flash LEDs.
    2 vs 1
  • Supports HDR10 video recording
    HDR10 video recording
    yes
    â–² Better than 64% of models
    This smartphone supports HDR10 video recording, the average smartphone does not. 35.9% of smartphones support HDR10.
  • Has a dual-tone LED flash
    Dual-tone LED flash
    yes
    â–² Better than 59% of models
    This smartphone features a dual-tone LED flash, the average smartphone does not. 41.4% of smartphones include dual-tone flash.
  • Wider front camera aperture
    Front camera aperture
    f/2.0
    â–² Better than 61% of models
    This smartphone has a wider front camera aperture than the average smartphone (f/2 vs f/2.2). The average aperture is f/2.2.
    f/2.0 vs f/2.2
  • Higher front camera megapixels
    Front camera megapixels
    20 MP
    â–² Better than 66% of models
    Market range: <5 – >40
    This smartphone has more front camera megapixels than the average smartphone (20 MP vs 16 MP). The average front camera has 16 MP megapixels.
    20 MP vs 16 MP
  • Newer Wi-Fi version
    Wi-Fi version
    Wi-Fi 6 (802.11ax), Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n)
    â–² Better than 53% of models
    This smartphone supports a newer Wi-Fi version than the average smartphone (Wi-Fi 6 (802.11ax), Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n) vs Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n)). The average smartphone uses Wi-Fi Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n).
    Wi-Fi 6 (802.11ax), Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n) vs Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n)
  • Has an infrared sensor
    Infrared sensor
    yes
    â–² Better than 67% of models
    This smartphone includes an infrared sensor, the average smartphone does not. 33.3% of smartphones feature an IR blaster.
  • Higher contrast ratio
    Contrast ratio
    5000000:1
    â–² Better than 79% of models
    This smartphone has a higher contrast ratio than the average smartphone (5000000:1 vs 1000000:1). The average smartphone contrast ratio is 1000000:1.
    AMOLED/OLED displays have an effectively infinite contrast ratio
    5,000,000:1 vs 1,000,000:1
  • 50% higher touch sampling rate
    Touch sampling rate
    360 Hz
    â–² Better than 78% of models
    Market range: <120 Hz – >480 Hz
    This smartphone has a higher touch sampling rate than the average smartphone (360 Hz vs 240 Hz). The average touch sampling rate is 240 Hz.
    360 Hz vs 240 Hz
  • Has an always-on display
    Always-on display
    yes
    â–² Better than 51% of models
    This smartphone features an always-on display, the average smartphone does not. 49.2% of smartphones offer always-on functionality.
  • 36.5% higher screen brightness
    Screen brightness
    901 nits
    â–² Better than 73% of models
    Market range: <437 nits – >1.3k nits
    This smartphone has a higher screen brightness than the average smartphone (901 nits vs 660 nits). The average smartphone brightness is 660 nits.
    901 nits vs 660 nits
  • 300 nits higher peak brightness
    Peak brightness
    1,300 nits
    â–² Better than 59% of models
    Market range: <480 nits – >3.6k nits
    This smartphone has a higher peak brightness than the average smartphone (1300 nits vs 1000 nits). The average peak brightness is 1000 nits.
    1,300 nits vs 1,000 nits
  • 10 min faster GSMArena full wired charge time
    GSMArena full wired charge time
    52 min
    â–² Better than 64% of models
    Market range: <36 min – >120 min
    This smartphone has a faster GSMArena full wired charge time than the average smartphone (52 min vs 62 min). The average charge time is 62 min.
    52 min vs 62 min
  • Supports aptX
    aptX
    yes
    â–² Better than 50% of models
    This smartphone supports aptX, the average smartphone does not. 50% of smartphones are aptX compatible.
  • 0.5 mm thinner
    Thickness
    7.8 mm
    â–² Better than 77% of models
    Market range: <7.53 mm – >10.5 mm
    This smartphone is thinner than the average smartphone (7.8 mm vs 8.3 mm). The average smartphone thickness is 8.3 mm.
    7.8 mm vs 8.3 mm
  • 29.5% slower GPU clock
    GPU frequency
    670 MHz
    â–¼ Worse than 82% of models
    Market range: <646 MHz – >1.2k MHz
    This smartphone has a lower GPU frequency than the average smartphone (670 MHz vs 950 MHz). The average smartphone has a GPU frequency of 950 MHz.
    670 MHz vs 950 MHz
  • No live text recognition
    Live text recognition
    no
    â–¼ Worse than 51% of models
    This smartphone does not support live text recognition, the average smartphone does. 50.9% of smartphones offer real-time text recognition.
  • No memory card slot
    Memory card slot
    no
    â–¼ Worse than 54% of models
    This smartphone does not have a memory card slot, the average smartphone does. 53.5% of smartphones feature expandable storage.
  • Lacks app tracking protection
    App tracking protection
    no
    â–¼ Worse than 70% of models
    This smartphone does not have app tracking protection, the average smartphone does. 70.2% of smartphones include app tracking protection.
  • Lower-resolution main camera
    Main camera megapixels
    48 MP & 8 MP & 5 MP
    â–¼ Worse than 79% of models
    Market range: <10 – >100
    This smartphone has a lower-resolution main camera than the average smartphone (48 MP & 8 MP & 5 MP vs 50 MP & 8 MP). The average smartphone has a 50 MP & 8 MP main camera.
    48 MP & 8 MP & 5 MP vs 50 MP & 8 MP
  • Lower IP rating
    IP rating
    IP53
    â–¼ Worse than 84% of models
    This smartphone has a lower IP rating than the average smartphone (IP53 vs IP67). 0.00% of smartphones have a higher IP rating.
    IP53 vs IP67
  • 28.8% lower PCMark Work 3.0 battery benchmark
    PCMark Work 3.0 battery benchmark
    560 min
    â–¼ Worse than 83% of models
    Market range: <487 min – >1.3k min
    This smartphone scores lower in PCMark Work 3.0 battery benchmark than the average smartphone (560 min vs 786 min). The average smartphone scores 786 min.
    560 min vs 786 min
  • Older Android version
    Android version
    Android 11
    â–¼ Worse than 80% of models
    This smartphone runs an older Android version than the average smartphone (Android 11 vs Android 14). The average smartphone runs Android version Android 14.
    Android 11 vs Android 14
  • 29.5% slower GPU clock
    GPU frequency
    670 MHz
    â–¼ Worse than 82% of models
    Market range: <646 MHz – >1.2k MHz
    This smartphone has a lower GPU frequency than the average smartphone (670 MHz vs 950 MHz). The average smartphone has a GPU frequency of 950 MHz.
    670 MHz vs 950 MHz
  • 16.7% larger process node
    Process node
    7 nm
    â–¼ Worse than 67% of models
    Market range: <4 nm – >12 nm
    This smartphone is manufactured on a larger process node than the average smartphone (7 nm vs 6 nm). The average smartphone uses a 6 nm process.
    7 nm vs 6 nm
  • 28.6% lower PassMark benchmark
    PassMark benchmark
    3,133
    â–¼ Worse than 67% of models
    Market range: <2.2k – >10.5k
    This smartphone has a lower PassMark score than the average smartphone (3,133 vs 4,389). The average smartphone scores 4,389 in PassMark.
    3,133 vs 4,389
  • No live text recognition
    Live text recognition
    no
    â–¼ Worse than 51% of models
    This smartphone does not support live text recognition, the average smartphone does. 50.9% of smartphones offer real-time text recognition.
  • Lacks app tracking protection
    App tracking protection
    no
    â–¼ Worse than 70% of models
    This smartphone does not have app tracking protection, the average smartphone does. 70.2% of smartphones include app tracking protection.
  • Older Android version
    Android version
    Android 11
    â–¼ Worse than 80% of models
    This smartphone runs an older Android version than the average smartphone (Android 11 vs Android 14). The average smartphone runs Android version Android 14.
    Android 11 vs Android 14
  • No scrolling screenshot support
    Scrolling screenshots
    no
    â–¼ Worse than 81% of models
    This smartphone does not support scrolling screenshots, the average smartphone does. 81.1% of smartphones allow scrolling screenshots.
  • Does not allow play while downloading
    Play while downloading
    no
    â–¼ Worse than 77% of models
    This smartphone cannot play games while downloading, the average smartphone can. 77.3% of smartphones support play-while-downloading.
  • No dynamic theme support
    Dynamic theme
    no
    â–¼ Worse than 82% of models
    This smartphone does not support dynamic themes, the average smartphone does. 81.9% of smartphones support dynamic theming.
  • Lower-resolution main camera
    Main camera megapixels
    48 MP & 8 MP & 5 MP
    â–¼ Worse than 79% of models
    Market range: <10 – >100
    This smartphone has a lower-resolution main camera than the average smartphone (48 MP & 8 MP & 5 MP vs 50 MP & 8 MP). The average smartphone has a 50 MP & 8 MP main camera.
    48 MP & 8 MP & 5 MP vs 50 MP & 8 MP
  • 4.1% smaller main camera sensor area
    Main camera sensor area
    30.7 mm²
    â–¼ Worse than 63% of models
    Market range: <19.7 mm² – >71.4 mm²
    This smartphone has a smaller main camera sensor area than the average smartphone (30.7 mm² vs 32 mm²). The average smartphone sensor area is 32 mm².
    30.7 mm² vs 32 mm²
  • No memory card slot
    Memory card slot
    no
    â–¼ Worse than 54% of models
    This smartphone does not have a memory card slot, the average smartphone does. 53.5% of smartphones feature expandable storage.
  • Older Bluetooth version
    Bluetooth version
    5.1
    â–¼ Worse than 60% of models
    This smartphone uses an older Bluetooth version than the average smartphone (5.1 vs 5.2). The average smartphone uses Bluetooth 5.2.
    5.1 vs 5.2
  • 28.8% lower PCMark Work 3.0 battery benchmark
    PCMark Work 3.0 battery benchmark
    560 min
    â–¼ Worse than 83% of models
    Market range: <487 min – >1.3k min
    This smartphone scores lower in PCMark Work 3.0 battery benchmark than the average smartphone (560 min vs 786 min). The average smartphone scores 786 min.
    560 min vs 786 min
  • 9.6% smaller battery capacity
    Battery capacity
    4,520 mAh
    â–¼ Worse than 78% of models
    Market range: <4k mAh – >7k mAh
    This smartphone has a smaller battery capacity than the average smartphone (4520 mAh vs 5000 mAh). The average smartphone has a capacity of 5000 mAh.
    4,520 mAh vs 5,000 mAh
  • No aptX HD
    aptX HD
    no
    â–¼ Worse than 51% of models
    This smartphone does not support aptX HD, the average smartphone does. 50.7% of smartphones support aptX HD.
  • Lower IP rating
    IP rating
    IP53
    â–¼ Worse than 84% of models
    This smartphone has a lower IP rating than the average smartphone (IP53 vs IP67). 0.00% of smartphones have a higher IP rating.
    IP53 vs IP67
  • 3 year/s older release date
    Release date
    2021
    â–¼ Worse than 81% of models
    Market range: <2k – >2k
    This smartphone is an older model than the average smartphone (2021 vs 2024). 3.00% of smartphones were released more recently.
    March 2021
    2021 vs 2024
  • 0.4 mm wider
    Width
    76.4 mm
    â–¼ Worse than 61% of models
    Market range: <73.1 mm – >81 mm
    This smartphone is wider than the average smartphone (76.4 mm vs 76 mm). The average smartphone has a width of 76 mm.
    76.4 mm vs 76 mm

Video reviews

Hands-on testing, unboxing, and real-world video evaluations

Expert reviews

In-depth analysis and verdict from leading tech publications

C
china-gadgets.de
17/04/2021
Summary of the review
Redmi K40 Pro: This is what the Poco F3 Pro could have looked like (Includes details on the standard K40)
(Translated)Show original
H
hifitest.de
03/02/2026
Summary of the review
Xiaomi Redmi K40 - Smartphone Technical Specifications - hifitest.de
(Translated)Show original

Third-party reviews

Based on 490 buyer reviews from online shops.
Reviews last updated: August 2026 · How we calculate this
Read buyer reviews on Amazon →

What we like about Xiaomi Redmi K40 (12GB + 256GB)

  • Excellent 6.67-inch 120Hz AMOLED display with great color accuracy and brightness, even in sunlight.
  • Powerful performance for its price range (Snapdragon 870/888 chipset variants), handling gaming and multitasking well with little lag.
  • Good battery life, often lasting a full day or more with moderate-to-heavy use, and fast 33W wired charging support.
  • Premium and refined design, including a thin and light body with a comfortable curved glass back.
  • Fast and accurate side-mounted fingerprint sensor.
  • Good audio quality with dual speakers and JBL tuning (on the Gaming edition), plus an IR blaster feature.
  • Good connectivity, including 5G support and strong Wi-Fi 6 speeds.
  • Great value for money, offering near-flagship specifications at a mid-range price.

What we don't like about Xiaomi Redmi K40 (12GB + 256GB)

  • Camera performance is considered average, with some users finding the quality disappointing, especially in low light or for video recording without OIS.
  • The ultra-wide and macro cameras are considered low resolution (8MP and 5MP, respectively) and lack detail.
  • Potential for overheating during extended heavy gaming sessions (especially the Snapdragon 888 variants).
  • MIUI software can contain bloatware and ads, and some users experience occasional software optimization issues.
  • Lack of a 3.5mm headphone jack and no microSD card slot for storage expansion.
  • Some models are the China variant and may have limitations with Google services or lack certain language options initially.

Verdict

The Xiaomi Redmi K40 (12GB + 256GB) is a powerful and high-value smartphone, featuring the flagship-grade Snapdragon 870 processor, making it highly capable for demanding tasks and gaming. Key highlights include its vibrant 6.67-inch FHD+ 120Hz AMOLED display and substantial 12GB of RAM with a generous 256GB of internal storage, ensuring smooth multitasking and ample space for media. Photography is handled by a versatile 48MP triple-camera setup, and the device is powered by a large 4,520mAh battery with 33W fast charging support. A potential con is the absence of an official IP water resistance rating and the lack of expandable storage via a microSD card slot.

Compare Xiaomi Redmi K40 (12GB + 256GB) with other smartphones

1Product to compare no. 1
VS
2Product to compare no. 2
VS
3Product to compare no. 3 (optional)

Graphic comparison of Xiaomi Redmi K40 (12GB + 256GB) and other smartphones

No results found