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

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  • Avg. price: ~£230
  • RAM capacity: 12 GB
  • Internal storage: 256 GB
  • Screen size: 6.67 inches
  • Main camera megapixels: 48 MP & 8 MP & 5 MP

Xiaomi Redmi K40 (12GB + 256GB) review. Compare 197 technical specifications and user reviews to see how it ranks among smartphones and if it's worth buying.

7.3

Overall score

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 components:

90.0%

7.2

Technical Score

10.0%

8.1

User score

Very good
7.2

Technical Score

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 components:

25.0%

7.9

Performance & Hardware

18.0%

6.6

Camera

15.0%

7.1

Display

15.0%

6.8

Battery

10.0%

7.0

Software

10.0%

7.8

Connectivity

4.0%

7.8

Audio

3.0%

7.1

Design

Very good
8.1

User score

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 components:

70.0%

8.8

User reviews

30.0%

6.5

Popularity

User score:
amazon
4.4
(243)

(Reviews last updated: Mar 2026)

Excellent
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    Best prices

    Best rankings

    ?

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

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

    Technical Score

    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 components:

    25.0%

    7.9

    Performance & Hardware

    18.0%

    6.6

    Camera

    15.0%

    7.1

    Display

    15.0%

    6.8

    Battery

    10.0%

    7.0

    Software

    10.0%

    7.8

    Connectivity

    4.0%

    7.8

    Audio

    3.0%

    7.1

    Design

    7.2
    Xiaomi Redmi K40 (12GB + 256GB) has a technical score of 7.25 points, which is higher than 52.7% of smartphones.
    User score

    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 components:

    70.0%

    8.8

    User reviews

    30.0%

    6.5

    Popularity

    User score:
    amazon
    4.4
    (243)

    (Reviews last updated: Mar 2026)

    8.1
    Xiaomi Redmi K40 (12GB + 256GB) has a user score of 8.1 points, which is higher than 61.2% of smartphones.
    Popularity
    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.
    6.5
    Xiaomi Redmi K40 (12GB + 256GB) has a popularity of 6.5 points, which is higher than 56% of smartphones.
    Ratio quality/price

    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 components:

    60.0%

    7.3

    Overall score

    40.0%

    9.3

    Price

    8.1
    Xiaomi Redmi K40 (12GB + 256GB) has a quality-to-price ratio of 8.1 points, which is higher than 63.6% of smartphones.
    Brand name
    What it is: The manufacturer or brand under which the smartphone is marketed and sold.
    When it matters: When you prefer a specific ecosystem, support network, or design philosophy.

    Importance: MEDIUM

    Xiaomi
    Processor model
    What it is: The central System-on-Chip (SoC) that houses the CPU, GPU, modem, and other core processing components.
    When it matters: When you want to know the specific engine powering your device's speed and features.

    Importance: HIGH

    Qualcomm Snapdragon 870
    Xiaomi Redmi K40 (12GB + 256GB) uses the Qualcomm Snapdragon 870 processor which is faster than processors in 74.6% of smartphones and equal to processors in 1.3% of smartphones.
    RAM capacity
    What it is: The amount of volatile memory available for running apps and multitasking.
    When it matters: When you use multiple apps at once or want smoother multitasking without reloads.

    Importance: HIGH

    Good value: >12 GB

    12 GB
    Xiaomi Redmi K40 (12GB + 256GB) 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
    What it is: The total built-in space available for apps, media, and files.
    When it matters: When you keep large libraries of photos, videos, and apps directly on your device.

    Importance: HIGH

    Good value: >256 GB

    256 GB
    Xiaomi Redmi K40 (12GB + 256GB) 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
    What it is: The maximum speed the processor can achieve temporarily under heavy load.
    When it matters: When you run demanding apps or games that require short bursts of peak performance.

    Importance: MEDIUM

    Good value: >3.2 GHz

    3.2 GHz
    The CPU boost clock speed of Xiaomi Redmi K40 (12GB + 256GB) is 3.2 GHz which is higher than the boost speed of 81.4% of smartphones and equal to that of 7% of smartphones.
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    Operating system
    What it is: The primary system software that manages the smartphone's hardware and software resources.
    When it matters: When you have a preference for the user interface and app ecosystem.

    Importance: HIGH

    Android
    Android 11
    Xiaomi Redmi K40 (12GB + 256GB) uses the Android operating system, which outperforms that of 1% of smartphones.
    Android 11
    Android version
    What it is: The specific generation number of the Android operating system installed on the device.
    When it matters: When you want to ensure app compatibility and access to the latest software features.

    Importance: LOW

    Android 11
    Xiaomi Redmi K40 (12GB + 256GB) 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
    What it is: Indicates whether the device receives operating system updates directly from the manufacturer or Google, ensuring timely security and feature updates.
    When it matters: When you want the fastest access to new features and security patches.

    Importance: HIGH

    no
    Xiaomi Redmi K40 (12GB + 256GB) does not receive direct OS updates. 20.5% of smartphones receive direct updates.
    Open-source OS
    What it is: Shows whether the device’s operating system is based on open-source code, allowing community contributions and greater transparency.
    When it matters: When you value transparency and potential community-driven modifications.

    Importance: LOW

    yes
    Xiaomi Redmi K40 (12GB + 256GB) uses an open-source OS. 94.6% of smartphones use an open-source OS.
    Dark mode
    What it is: A display option that uses dark backgrounds to reduce eye strain and save battery on OLED screens.
    When it matters: When you want to reduce eye strain at night or save battery on OLED screens.

    Importance: LOW

    yes
    Xiaomi Redmi K40 (12GB + 256GB) offers dark mode. 95.8% of smartphones support this feature.
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    Multi-lens main camera
    What it is: Indicates that the rear camera system includes multiple lenses (e.g., wide, ultra-wide, telephoto) for versatile shooting options.
    When it matters: When you want versatility to shoot wide landscapes, standard shots, and zoomed details.

    Importance: MEDIUM

    yes
    Xiaomi Redmi K40 (12GB + 256GB) includes a multi-lens main camera system. 93.7% of smartphones include multi-lens setups.
    Main camera megapixels
    What it is: The resolution of the primary rear camera sensor, measured in millions of pixels (MP). Higher megapixels can capture more detail.
    When it matters: When you want to capture high-resolution images that can be cropped or printed large.

    Importance: HIGH

    Good value: >50 MP

    48 MP & 8 MP & 5 MP
    Xiaomi Redmi K40 (12GB + 256GB) has a main camera resolution of 48 MP & 8 MP & 5 MP MP which is lower than that of 78.7% of smartphones and equal to that of 0.4% of smartphones.
    Main camera aperture
    What it is: The size of the lens opening (f-stop) that controls light entry. A lower f-number indicates a wider aperture, allowing better low-light shots.
    When it matters: When you want better low-light performance or a natural background blur effect.

    Importance: HIGH

    ?
    Main camera sensor area
    What it is: The total physical surface area of the camera sensor (calculated by multiplying the number of megapixels by the square of the individual pixel size). A larger area captures more light, resulting in better night photos and less digital noise.
    When it matters: When you want to capture clear, detailed photos in low-light conditions with minimal grain and achieve a natural, professional-looking background blur for portraits.

    Importance: HIGH

    Good value: >60

    30.7 mm²
    Xiaomi Redmi K40 (12GB + 256GB) 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
    What it is: The physical size of individual pixels on the camera sensor, measured in micrometers. Larger pixels typically capture more light for better low-light performance.
    When it matters: When you shoot in low light and want reduced noise in your photos.

    Importance: MEDIUM

    Good value: ≥1.2 µm

    0.8 µm
    Xiaomi Redmi K40 (12GB + 256GB) 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.
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    Number of SIM slots
    What it is: The number of physical SIM cards or eSIM profiles the device can support simultaneously.
    When it matters: When you need to manage two different phone numbers or travel internationally with a local SIM.

    Importance: MEDIUM

    Good value: ≥2

    2
    Xiaomi Redmi K40 (12GB + 256GB) 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
    What it is: The hardware component capable of connecting to mobile cellular networks for voice and data.
    When it matters: When you need to stay connected to calls and internet away from Wi-Fi.

    Importance: LOW

    yes
    Xiaomi Redmi K40 (12GB + 256GB) includes a cellular module. 100% of smartphones include cellular modules.
    5G connectivity
    What it is: Support for the fifth generation of mobile network technology, offering significantly faster data speeds and lower latency.
    When it matters: When you need the fastest possible mobile data speeds for streaming and downloading on the go.

    Importance: MEDIUM

    yes
    Xiaomi Redmi K40 (12GB + 256GB) supports 5G connectivity. 66.9% of smartphones support 5G.
    LTE support
    What it is: Support for Long-Term Evolution (4G) networks, providing high-speed mobile data.
    When it matters: When you need reliable mobile internet coverage in areas where 5G isn't available.

    Importance: HIGH

    yes
    Xiaomi Redmi K40 (12GB + 256GB) supports LTE. 99.7% of smartphones include LTE connectivity.
    Wi-Fi connectivity
    What it is: The ability to connect to wireless local area networks for internet access and local networking.
    When it matters: When you want to save mobile data and connect to home or public networks.

    Importance: HIGH

    yes
    Xiaomi Redmi K40 (12GB + 256GB) supports Wi-Fi connectivity. 100% of smartphones offer Wi-Fi support.
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    Screen size
    What it is: The physical diagonal measurement of the display area, usually expressed in inches.
    When it matters: When you choose between a compact phone for one-handed use or a large screen for media.

    Importance: MEDIUM

    Good value: ≥6.6 inches

    6.67 inches
    Xiaomi Redmi K40 (12GB + 256GB) 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
    What it is: The total number of pixels displayed on the screen, expressed as width x height, determining sharpness.
    When it matters: When you want crisp text and sharp details in photos and videos.

    Importance: HIGH

    1080 x 2400 px
    Xiaomi Redmi K40 (12GB + 256GB) has a screen resolution of 1080 x 2400 px which is higher than that of 36.7% of smartphones and equal to that of 20.4% of smartphones.
    Pixel density
    What it is: The concentration of pixels on the display, measured in pixels per inch (PPI), affecting image clarity.
    When it matters: When you want the image to look perfectly smooth with no visible pixels.

    Importance: HIGH

    Good value: >400 ppi

    395 ppi
    Xiaomi Redmi K40 (12GB + 256GB) 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
    What it is: The specific technology used for the screen panel (e.g., OLED, IPS LCD), influencing contrast, color, and efficiency.
    When it matters: When you care about vibrant colors, deep blacks, and battery efficiency.

    Importance: HIGH

    OLED/AMOLED
    Xiaomi Redmi K40 (12GB + 256GB) uses a OLED/AMOLED display type. 58.6% of smartphones use this display technology.
    Refresh rate
    What it is: The number of times per second the display updates the image, measured in Hertz (Hz); higher rates offer smoother motion.
    When it matters: When you want scrolling to feel fluid and games to look smoother.

    Importance: HIGH

    Good value: ≥120 Hz

    120 Hz
    Xiaomi Redmi K40 (12GB + 256GB) 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.
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    Battery capacity
    What it is: The amount of electric charge the battery can hold, measured in milliampere-hours (mAh).
    When it matters: When you want a general idea of how large the battery is physically.

    Importance: HIGH

    Good value: >5000 mAh

    4520 mAh
    Xiaomi Redmi K40 (12GB + 256GB) has a battery capacity of 4520 mAh which is smaller than the batteries in 77.9% of smartphones and equal to those in 0.4% of smartphones.
    Charging speed
    What it is: The maximum power input supported for wired charging, measured in Watts (W).
    When it matters: When you are in a rush and need to top up your battery quickly.

    Importance: HIGH

    Good value: >60 W

    33 W
    Xiaomi Redmi K40 (12GB + 256GB) 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
    What it is: In the context of modern electronics, "Fast Charging" refers to any technology that delivers power significantly higher than the traditional USB baseline. While the industry standard for a basic charger is 5W (5V at 1A), a charger is generally classified as a fast charger if it provides at least 18W of power.
    When it matters: When you want to minimize the time your phone spends tethered to a wall outlet.

    Importance: MEDIUM

    yes
    Xiaomi Redmi K40 (12GB + 256GB) supports fast charging. 93.1% of smartphones support fast charging.
    GSMArena full wired charge time
    What it is: The time taken to charge the battery from 0% to 100% using the bundled or recommended charger, as measured by GSMArena.
    When it matters: When you want to know exactly how long it takes to charge from 0 to 100% in real-world tests.

    Importance: MEDIUM

    Good value: <45 min

    52 min
    Xiaomi Redmi K40 (12GB + 256GB) 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
    What it is: The ability to charge the battery without cables by placing the device on a compatible charging pad.
    When it matters: When you prefer the convenience of dropping your phone on a pad without fumbling with cables.

    Importance: MEDIUM

    no
    Xiaomi Redmi K40 (12GB + 256GB) does not support wireless charging. 25.3% of smartphones support wireless charging.
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    Stereo speakers
    What it is: A setup involving two or more speakers to create a left-right audio separation for immersive sound.
    When it matters: When you watch videos or play games without headphones and want immersive sound.

    Importance: MEDIUM

    yes
    Xiaomi Redmi K40 (12GB + 256GB) includes stereo speakers. 64.5% of smartphones provide stereo audio.
    3.5 mm headphone jack
    What it is: A standard analog audio port for connecting wired headphones or auxiliary cables.
    When it matters: When you prefer using traditional wired headphones without dongles or adapters.

    Importance: LOW

    no
    Xiaomi Redmi K40 (12GB + 256GB) does not include a 3.5 mm headphone jack. 45.3% of smartphones still offer this port.
    Number of microphones
    What it is: The total count of microphones on the device, used for audio recording, noise cancellation, and voice isolation.
    When it matters: When you want clear audio recording and better noise cancellation during calls.

    Importance: MEDIUM

    Good value: ≥3

    ?
    FM radio
    What it is: A built-in receiver allowing users to listen to local FM radio stations using wired headphones as an antenna.
    When it matters: When you want to listen to local radio stations without using mobile data.

    Importance: LOW

    no
    Xiaomi Redmi K40 (12GB + 256GB) does not include an FM radio. 33.7% of smartphones offer FM radio functionality.
    aptX Lossless
    What it is: A Bluetooth technology designed to deliver CD-quality audio without data loss during transmission.
    When it matters: When you demand CD-quality audio over Bluetooth with no loss of detail.

    Importance: LOW

    no
    Xiaomi Redmi K40 (12GB + 256GB) does not support aptX Lossless. 12.9% of smartphones provide aptX Lossless.
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    Height
    What it is: The vertical dimension of the device.
    When it matters: When you are concerned about whether the phone will fit in your pocket or purse.

    Importance: LOW

    Good value: <162 mm

    163.7 mm
    Xiaomi Redmi K40 (12GB + 256GB) 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
    What it is: The horizontal dimension of the device when held in portrait orientation.
    When it matters: When you care about how easy the phone is to grip and use with one hand.

    Importance: LOW

    Good value: <75 mm

    76.4 mm
    Xiaomi Redmi K40 (12GB + 256GB) 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
    What it is: The depth of the device profile, excluding the camera bump unless specified.
    When it matters: When you prefer a sleek, slim profile that slides easily into tight pockets.

    Importance: LOW

    Good value: <8 mm

    7.8 mm
    Xiaomi Redmi K40 (12GB + 256GB) 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
    What it is: The total mass of the smartphone, affecting how heavy it feels in the hand.
    When it matters: When you want a phone that feels light in your pocket or substantial in your hand.

    Importance: MEDIUM

    Good value: <190 g

    196 g
    Xiaomi Redmi K40 (12GB + 256GB) weighs 196 g which is lighter than 50.1% of smartphones and equal to the weight of 2.3% of smartphones.
    Device volume
    What it is: The calculated total volume of the device's physical body.
    When it matters: When you want to understand the overall physical bulk of the device.

    Importance: LOW

    Good value: <98cm³

    86716 cm³
    Xiaomi Redmi K40 (12GB + 256GB) has a device volume of 86716 cm³ which is smaller than 76.5% of smartphones and equal to that of 1.7% of smartphones.
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    Xiaomi Redmi K40 (12GB + 256GB) vs the average smartphone

    • Higher contrast ratio
      Xiaomi Redmi K40 (12GB + 256GB) 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
      What it is: The ratio between the luminance of the brightest white and the darkest black the display can produce.
      When it matters: When you want punchy colors and true blacks for an immersive viewing experience.

      Importance: MEDIUM

      Xiaomi Redmi K40 (12GB + 256GB) has a higher contrast ratio than the average smartphone (5000000:1 vs 1000000:1 ). The average smartphone contrast ratio is 1000000:1 .5000000:1 vs 1000000:1
    • Newer DDR memory version
      Xiaomi Redmi K40 (12GB + 256GB) supports a newer DDR version than the average smartphone (5.0 vs 4.0). The average DDR version is 4.
      What it is: The generation of DDR (Double Data Rate) RAM used in the device (e.g., LPDDR4X, LPDDR5). Newer versions offer better speed and power efficiency.
      When it matters: When you want the latest balance of high speed and improved power efficiency.

      Importance: MEDIUM

      Good value: 5

      Xiaomi Redmi K40 (12GB + 256GB) supports a newer DDR version than the average smartphone (5.0 vs 4.0). The average DDR version is 4.5.0 vs 4.0
    • 4 GB more RAM
      Xiaomi Redmi K40 (12GB + 256GB) has more RAM capacity than the average smartphone (12 GB vs 8 GB). The average smartphone has 8 GB of RAM.
      What it is: The amount of volatile memory available for running apps and multitasking.
      When it matters: When you use multiple apps at once or want smoother multitasking without reloads.

      Importance: HIGH

      Good value: >12 GB

      Xiaomi Redmi K40 (12GB + 256GB) 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
    • Has an always-on display
      Xiaomi Redmi K40 (12GB + 256GB) features an always-on display, the average smartphone does not. 49.1% of smartphones offer always-on functionality.
      What it is: A feature that keeps a portion of the screen active to show time, date, and notifications while the device is asleep.
      When it matters: When you want to glance at the time or notifications without touching the phone.

      Importance: MEDIUM

      Xiaomi Redmi K40 (12GB + 256GB) features an always-on display, the average smartphone does not. 49.1% of smartphones offer always-on functionality.
    • 66.7% lower TDP
      Xiaomi Redmi K40 (12GB + 256GB) has a lower TDP than the average smartphone (10 W vs 6 W). The average TDP for smartphones is 6 W.
      What it is: The amount of heat a processor is expected to generate under typical use, measured in watts. It helps determine cooling requirements.
      When it matters: When you are concerned about how much heat the device generates under load.

      Importance: MEDIUM

      Good value: >9 W

      Xiaomi Redmi K40 (12GB + 256GB) 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
    • 6 more memory channels
      Xiaomi Redmi K40 (12GB + 256GB) has more memory channels than the average smartphone (8 vs 2). The average smartphone has 2 memory channels.
      What it is: The number of independent data paths between the RAM and CPU. Dual-channel or more can enhance memory throughput and multitasking efficiency.
      When it matters: When you want reduced latency and faster data access for the CPU.

      Importance: LOW

      Good value: 4

      Xiaomi Redmi K40 (12GB + 256GB) has more memory channels than the average smartphone (8 vs 2). The average smartphone has 2 memory channels.8 vs 2
    • 33.3% higher CPU boost clock speed
      Xiaomi Redmi K40 (12GB + 256GB) 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.
      What it is: The maximum speed the processor can achieve temporarily under heavy load.
      When it matters: When you run demanding apps or games that require short bursts of peak performance.

      Importance: MEDIUM

      Good value: >3.2 GHz

      Xiaomi Redmi K40 (12GB + 256GB) 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
    • Higher CPU base clock speed
      Xiaomi Redmi K40 (12GB + 256GB) has a higher CPU base clock speed than the average smartphone (1x 3.2 GHz & 3x 2.42 GHz & 4x 1.8 GHz vs 2x 2.2 GHz & 6x 2 GHz ). The average smartphone has a base clock speed of 2x 2.2 GHz & 6x 2 GHz .
      What it is: The processor’s standard operating frequency under normal conditions, measured in GHz.
      When it matters: When you want consistent, reliable performance for standard daily tasks like browsing or messaging.

      Importance: MEDIUM

      Xiaomi Redmi K40 (12GB + 256GB) has a higher CPU base clock speed than the average smartphone (1x 3.2 GHz & 3x 2.42 GHz & 4x 1.8 GHz vs 2x 2.2 GHz & 6x 2 GHz ). The average smartphone has a base clock speed of 2x 2.2 GHz & 6x 2 GHz .1.0x 3.2 GHz & 3.0x 2.42 GHz & 4.0x 1.8 GHz vs 2.0x 2.2 GHz & 6.0x 2.0 GHz
    • Newer DDR memory version
      Xiaomi Redmi K40 (12GB + 256GB) supports a newer DDR version than the average smartphone (5.0 vs 4.0). The average DDR version is 4.
    • 4 GB more RAM
      Xiaomi Redmi K40 (12GB + 256GB) has more RAM capacity than the average smartphone (12 GB vs 8 GB). The average smartphone has 8 GB of RAM.
    • 66.7% lower TDP
      Xiaomi Redmi K40 (12GB + 256GB) has a lower TDP than the average smartphone (10 W vs 6 W). The average TDP for smartphones is 6 W.
    • 33.3% higher CPU boost clock speed
      Xiaomi Redmi K40 (12GB + 256GB) 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.
    • 6 more memory channels
      Xiaomi Redmi K40 (12GB + 256GB) has more memory channels than the average smartphone (8 vs 2). The average smartphone has 2 memory channels.
    • Higher CPU base clock speed
      Xiaomi Redmi K40 (12GB + 256GB) has a higher CPU base clock speed than the average smartphone (1x 3.2 GHz & 3x 2.42 GHz & 4x 1.8 GHz vs 2x 2.2 GHz & 6x 2 GHz ). The average smartphone has a base clock speed of 2x 2.2 GHz & 6x 2 GHz .
    • Better processor
      Xiaomi Redmi K40 (12GB + 256GB) features a better processor than the average smartphone (Qualcomm Snapdragon 870 vs Qualcomm Snapdragon 6s Gen 3 ).
    • 31.7% higher Geekbench 6 multi-core benchmark score
      Xiaomi Redmi K40 (12GB + 256GB) 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.
    • 24.3% higher Geekbench 6 single-core benchmark score
      Xiaomi Redmi K40 (12GB + 256GB) scores better in Geekbench 6 single-core than the average smartphone (1,171 vs 942). The average smartphone scores 942 in single-core.
    • 71.9% higher memory bandwidth
      Xiaomi Redmi K40 (12GB + 256GB) 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.
    • 14.3% higher maximum RAM
      Xiaomi Redmi K40 (12GB + 256GB) supports more maximum RAM than the average smartphone (16 GB vs 14 GB). The average smartphone supports 14 GB RAM.
    • 37.4% higher 3DMark Wild Life benchmark
      Xiaomi Redmi K40 (12GB + 256GB) scores higher in 3DMark Wild Life than the average smartphone (4,279 vs 3,115). The average smartphone scores 3,115.
    • Has a front LED flash
      Xiaomi Redmi K40 (12GB + 256GB) features a front-facing LED flash, the average smartphone does not. 7.7% of smartphones include a front flash.
    • Supports laser autofocus
      Xiaomi Redmi K40 (12GB + 256GB) features laser autofocus, the average smartphone does not. 21.4% of smartphones include laser AF.
    • Supports HDR10 video recording
      Xiaomi Redmi K40 (12GB + 256GB) supports HDR10 video recording, the average smartphone does not. 36.1% of smartphones support HDR10.
    • Has a dual-tone LED flash
      Xiaomi Redmi K40 (12GB + 256GB) features a dual-tone LED flash, the average smartphone does not. 41.4% of smartphones include dual-tone flash.
    • 1 more flash LEDs
      Xiaomi Redmi K40 (12GB + 256GB) has more flash LEDs than the average smartphone (2 vs 1). The average smartphone has 1 flash LEDs.
    • Wider front camera aperture
      Xiaomi Redmi K40 (12GB + 256GB) has a wider front camera aperture than the average smartphone (f/2.0 vs f/2.2 ). The average aperture is f/2.2 .
    • Higher front camera megapixels
      Xiaomi Redmi K40 (12GB + 256GB) has more front camera megapixels than the average smartphone (20 MP vs 16 MP ). The average front camera has 16 MP megapixels.
    • Has an infrared sensor
      Xiaomi Redmi K40 (12GB + 256GB) includes an infrared sensor, the average smartphone does not. 33.3% of smartphones feature an IR blaster.
    • Higher contrast ratio
      Xiaomi Redmi K40 (12GB + 256GB) has a higher contrast ratio than the average smartphone (5000000:1 vs 1000000:1 ). The average smartphone contrast ratio is 1000000:1 .
    • Has an always-on display
      Xiaomi Redmi K40 (12GB + 256GB) features an always-on display, the average smartphone does not. 49.1% of smartphones offer always-on functionality.
    • 50% higher touch sampling rate
      Xiaomi Redmi K40 (12GB + 256GB) has a higher touch sampling rate than the average smartphone (360 Hz vs 240 Hz). The average touch sampling rate is 240 Hz.
    • 36.5% higher screen brightness
      Xiaomi Redmi K40 (12GB + 256GB) has a higher screen brightness than the average smartphone (901 nits vs 660 nits). The average smartphone brightness is 660 nits.
    • 300 nits higher peak brightness
      Xiaomi Redmi K40 (12GB + 256GB) has a higher peak brightness than the average smartphone (1300 nits vs 1000 nits). The average peak brightness is 1000 nits.
    • 10 min faster GSMArena full wired charge time
      Xiaomi Redmi K40 (12GB + 256GB) has a faster GSMArena full wired charge time than the average smartphone (52 min vs 62 min). The average charge time is 62 min.
    • 0.5 mm thinner
      Xiaomi Redmi K40 (12GB + 256GB) is thinner than the average smartphone (7.8 mm vs 8.3 mm). The average smartphone thickness is 8.3 mm.

    Total
    Performance & Hardware
    Camera
    Connectivity
    Display
    Battery
    Design
    • 29.5% slower GPU clock
      Xiaomi Redmi K40 (12GB + 256GB) has a lower GPU frequency than the average smartphone (670 MHz vs 950 MHz). The average smartphone has a GPU frequency of 950 MHz.
    • 16.7% larger process node
      Xiaomi Redmi K40 (12GB + 256GB) is manufactured on a larger process node than the average smartphone (7 nm vs 6 nm). The average smartphone uses a 6 nm process.
    • 28.6% lower PassMark benchmark
      Xiaomi Redmi K40 (12GB + 256GB) has a lower PassMark score than the average smartphone (3,133 vs 4,389). The average smartphone scores 4,389 in PassMark.
    • Lacks app tracking protection
      Xiaomi Redmi K40 (12GB + 256GB) does not have app tracking protection, the average smartphone does. 70.3% of smartphones include app tracking protection.
    • No live text recognition
      Xiaomi Redmi K40 (12GB + 256GB) does not support live text recognition, the average smartphone does. 51.1% of smartphones offer real-time text recognition.
    • No scrolling screenshot support
      Xiaomi Redmi K40 (12GB + 256GB) does not support scrolling screenshots, the average smartphone does. 81.1% of smartphones allow scrolling screenshots.
    • No dynamic theme support
      Xiaomi Redmi K40 (12GB + 256GB) does not support dynamic themes, the average smartphone does. 82% of smartphones support dynamic theming.
    • Older Android version
      Xiaomi Redmi K40 (12GB + 256GB) runs an older Android version than the average smartphone (Android 11 vs Android 14 ). The average smartphone runs Android version Android 14 .
    • Does not allow play while downloading
      Xiaomi Redmi K40 (12GB + 256GB) cannot play games while downloading, the average smartphone can. 77.3% of smartphones support play-while-downloading.
    • Lower-resolution main camera
      Xiaomi Redmi K40 (12GB + 256GB) 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.
    • 4.1% smaller main camera sensor area
      Xiaomi Redmi K40 (12GB + 256GB) 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.
    • No memory card slot
      Xiaomi Redmi K40 (12GB + 256GB) does not have a memory card slot, the average smartphone does. 53.5% of smartphones feature expandable storage.
    • Older Bluetooth version
      Xiaomi Redmi K40 (12GB + 256GB) uses an older Bluetooth version than the average smartphone (5.1 vs 5.2). The average smartphone uses Bluetooth 5.2.
    • 28.8% lower PCMark Work 3.0 battery benchmark
      Xiaomi Redmi K40 (12GB + 256GB) scores lower in PCMark Work 3.0 battery benchmark than the average smartphone (560 min vs 786 min). The average smartphone scores 786 min.
    • 9.6% smaller battery capacity
      Xiaomi Redmi K40 (12GB + 256GB) has a smaller battery capacity than the average smartphone (4520 mAh vs 5000 mAh). The average smartphone has a capacity of 5000 mAh.
    • Lower IP rating
      Xiaomi Redmi K40 (12GB + 256GB) has a lower IP rating than the average smartphone (IP53 vs IP67 ). 0.00% of smartphones have a higher IP rating.
    • 0.4 mm wider
      Xiaomi Redmi K40 (12GB + 256GB) is wider than the average smartphone (76.4 mm vs 76 mm). The average smartphone has a width of 76 mm.
    • Lower IP rating
      Xiaomi Redmi K40 (12GB + 256GB) has a lower IP rating than the average smartphone (IP53 vs IP67 ). 0.00% of smartphones have a higher IP rating.
      What it is: A standardized code (Ingress Protection) indicating the device's resistance to dust and water intrusion.
      When it matters: When you want to know if your phone can survive a splash, a dunk, or a dusty environment.

      Importance: MEDIUM

      Xiaomi Redmi K40 (12GB + 256GB) has a lower IP rating than the average smartphone (IP53 vs IP67 ). 0.00% of smartphones have a higher IP rating.IP53 vs IP67
    • No memory card slot
      Xiaomi Redmi K40 (12GB + 256GB) does not have a memory card slot, the average smartphone does. 53.5% of smartphones feature expandable storage.
      What it is: A physical slot, usually for microSD cards, allowing users to expand the device's storage capacity.
      When it matters: When you want to cheaply expand your storage for photos, music, and movies.

      Importance: LOW

      Xiaomi Redmi K40 (12GB + 256GB) does not have a memory card slot, the average smartphone does. 53.5% of smartphones feature expandable storage.
    • Lacks app tracking protection
      Xiaomi Redmi K40 (12GB + 256GB) does not have app tracking protection, the average smartphone does. 70.3% of smartphones include app tracking protection.
      What it is: A system-level feature that limits how apps track user behavior across other apps and services.
      When it matters: When you want to stop apps from following your activity across other companies' apps and websites.

      Importance: MEDIUM

      Xiaomi Redmi K40 (12GB + 256GB) does not have app tracking protection, the average smartphone does. 70.3% of smartphones include app tracking protection.
    • 29.5% slower GPU clock
      Xiaomi Redmi K40 (12GB + 256GB) has a lower GPU frequency than the average smartphone (670 MHz vs 950 MHz). The average smartphone has a GPU frequency of 950 MHz.
      What it is: The operating speed of the graphics processing unit, which affects rendering and gaming.
      When it matters: When you want smoother frame rates in games and faster rendering in graphics apps.

      Importance: MEDIUM

      Good value: >950 MHz

      Xiaomi Redmi K40 (12GB + 256GB) 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
    • Lower-resolution main camera
      Xiaomi Redmi K40 (12GB + 256GB) 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.
      What it is: The resolution of the primary rear camera sensor, measured in millions of pixels (MP). Higher megapixels can capture more detail.
      When it matters: When you want to capture high-resolution images that can be cropped or printed large.

      Importance: HIGH

      Good value: >50 MP

      Xiaomi Redmi K40 (12GB + 256GB) 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
    • 28.8% lower PCMark Work 3.0 battery benchmark
      Xiaomi Redmi K40 (12GB + 256GB) scores lower in PCMark Work 3.0 battery benchmark than the average smartphone (560 min vs 786 min). The average smartphone scores 786 min.
      What it is: A synthetic benchmark that measures battery life by simulating continuous productivity tasks until depletion.
      When it matters: When you want to compare battery endurance under continuous productivity workloads.

      Importance: MEDIUM

      Good value: >800

      Xiaomi Redmi K40 (12GB + 256GB) 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
    • No live text recognition
      Xiaomi Redmi K40 (12GB + 256GB) does not support live text recognition, the average smartphone does. 51.1% of smartphones offer real-time text recognition.
      What it is: A feature that can identify and extract text from images, camera viewfinder, or documents in real-time for copying, translating, or other actions.
      When it matters: When you need to quickly copy text from a physical document or sign using your camera.

      Importance: MEDIUM

      Xiaomi Redmi K40 (12GB + 256GB) does not support live text recognition, the average smartphone does. 51.1% of smartphones offer real-time text recognition.
    • 9.6% smaller battery capacity
      Xiaomi Redmi K40 (12GB + 256GB) has a smaller battery capacity than the average smartphone (4520 mAh vs 5000 mAh). The average smartphone has a capacity of 5000 mAh.
      What it is: The amount of electric charge the battery can hold, measured in milliampere-hours (mAh).
      When it matters: When you want a general idea of how large the battery is physically.

      Importance: HIGH

      Good value: >5000 mAh

      Xiaomi Redmi K40 (12GB + 256GB) has a smaller battery capacity than the average smartphone (4520 mAh vs 5000 mAh). The average smartphone has a capacity of 5000 mAh.4520 mAh vs 5000 mAh
    Total
    Performance & Hardware
    Software
    Camera
    Connectivity
    Battery
    Design

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

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    Third-party reviews

    amazon
    4.4
    243 Reviews

    (Reviews last updated: Mar 2026)

    4.4
    243 Reviews

    (Reviews last updated: Mar 2026)

    What customers 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 customers dislike 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.

    Expert reviews

    H
    hifitest.de
    ?
    03/02/2026
    Xiaomi Redmi K40 - Smartphone Technical Specifications - hifitest.de

    The Xiaomi Redmi K40 series, noted as a budget flagship, features a 6.67-inch 120Hz E4 AMOLED display, a slim 7.8mm design, and powerful processors. Performance is a highlight, with the Snapdragon 870 or 888, 33W fast charging, and dual speakers providing a fast, premium user experience. However, cons include an older 48MP main sensor lacking OIS, no headphone jack or microSD slot,...Read more

    (Translated)Show original
    C
    china-gadgets.de
    ?
    17/04/2021
    Redmi K40 Pro: This is what the Poco F3 Pro could have looked like (Includes details on the standard K40)

    The Xiaomi Redmi K40 Pro is a 2021 "flagship killer" featuring a high-end Snapdragon 888 chipset, fast UFS 3.1 storage, and a top-tier 6.67-inch 120Hz Samsung E4 AMOLED display. While delivering excellent raw performance and screen quality, the device faces, however, notable overheating issues during intense tasks and uses a plastic frame. Key strengths include the impressive...Read more

    (Translated)Show original
    H
    hifitest.de
    ?
    03/02/2026
    Xiaomi Redmi K40 - Smartphone Technical Specifications - hifitest.de

    The Xiaomi Redmi K40 series, noted as a budget flagship, features a 6.67-inch 120Hz E4 AMOLED display, a slim 7.8mm design, and powerful processors. Performance is a highlight, with the Snapdragon 870 or 888, 33W fast charging, and dual speakers providing a fast, premium user experience. However, cons include an older 48MP main sensor lacking OIS, no headphone jack or microSD slot,...Read more

    (Translated)Show original
    C
    china-gadgets.de
    ?
    17/04/2021
    Redmi K40 Pro: This is what the Poco F3 Pro could have looked like (Includes details on the standard K40)

    The Xiaomi Redmi K40 Pro is a 2021 "flagship killer" featuring a high-end Snapdragon 888 chipset, fast UFS 3.1 storage, and a top-tier 6.67-inch 120Hz Samsung E4 AMOLED display. While delivering excellent raw performance and screen quality, the device faces, however, notable overheating issues during intense tasks and uses a plastic frame. Key strengths include the impressive...Read more

    (Translated)Show original

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