Dual-frequency precision for in-depth health checking
Accurate
Dual-frequency electrical impedance measurement
Detailed
25 health indicators
Reliable
Key body fat data benchmarked against the gold standard DEXA measurement
Worry-free
Multiple measurement modes
Is your body healthy?
Just step on the scale to find out
Physical health is determined by body fat percentage and muscle mass. Xiaomi Body Composition Scale S400 can accurately measure body data and provide a detailed analysis of your physical condition, identifying 'hidden factors' contributing to a risk of obesity to help scientifically manage your body shape and health.
Dual-frequency bioelectrical impedance measurement
A new level of precision
Using high and low dual-frequency alternating currents to penetrate cell membranes, intracellular and extracellular fluids' electrical impedance values can be accurately measured to capture physical data such as body fat, water content, and muscle mass.
50kHz low frequency
Measure extracellular fluid
Measure water in blood and tissue fluids
250kHz high frequency
Measure intracellular fluid
Measure cellular components of muscle, fat, bones, and organs
Key data benchmarked against the industry gold standard
Professional and accurate body fat measurement
DEXA* is widely recognised as the industry gold standard for measuring body composition. The closer the correlation coefficient is to 1, the more accurate the measurement data indicates. Benchmarked against DEXA, Xiaomi Body Composition Scale S400 boasts a correlation coefficient of ≥0.93* for key data such as body fat percentage and fat mass, ensuring more accurate and reliable data.
Analyse 25 body composition indicators
Take full control of your health
A single measurement can generate an analysis report of 25 body composition indicators* evaluating body composition including body fat, muscle mass, water content, protein, and bone mineral density. It also evaluates visceral fat rate and identifies hidden obesity risks. Get a deep analysis of your health status so you can quickly and easily identify any changes.
Weight
Heart rate
BMI
Body score
Body water mass
Body water
Fat mass
Body fat percentage
Protein mass
Protein percentage
Muscle mass
Muscle percentage
Bone mineral content
Bone mineral percentage
Visceral fat rate
Cover more family members
Keep the whole family healthy*
With a fat measurement algorithm that can be calibrated for young people, the scale is suitable for all family members. Parents can quickly assess their children's health status and adjust their dietary and exercise schedules to make sure they maintain a healthy weight and body fat level and avoid the risks associated with obesity.
Store information for up to 36 family members*
Can be used from 6 to 80 years old
Static heart rate monitoring*
Focus on a healthy heart
A high or low heart rate could be a sign of a health issue. Xiaomi Body Composition Scale S400 lets you track your heart rate with static heart rate monitoring*. Keeping an eye on heart health has never been more convenient.
Low rate
Normal rate
High rate
*The heart rate monitoring function can be enabled or disabled via the app.
Multiple weighing modes
One scale, more functions
Quickly switch between modes using Xiaomi Home app* to Weighing with baby, or Balance testing, Visitor measurement, and allow guests to weigh themselves.
Small object weighing*
Accurate to 0.1kg
Baby holder mode
Weigh infants and pets
Guest mode
Measurement data is not stored
Large measurement range
Can measure from 0.1kg to 150kg
Accurate and stable with a longer battery life
A scale that the whole family can trust
The large-diameter electrode pad enhances contact conductivity efficiency for more accurate measurements. A larger anti-slip surface ensures stability to prevent the scale from tipping over. With a battery that only needs to be replaced every six months, the whole family can enjoy a better user experience for longer.
58mm
Large-diameter electrode pad
40mm
Enlarged anti-slip surface
180-day
Long battery life*
More interactive display
View key data at a glance
The body fat, heart rate and battery level are displayed directly on the scale for even more convenience. Open Xiaomi Home app at any time to view detailed reports for a clearer understanding of your health status.
Body weight display*
Body fat percentage display
Heart rate display
Encouragement for achieving key benchmarks*
Low battery warning
Bluetooth® connection status
*The unit displayed on the scale can be set via the app.
Connect to Bluetooth® gateway for automatic synchronisation and instant access
The scale can be paired with and connected to your phone via a Bluetooth® gateway*. Measurement data will be automatically saved and uploaded to the server for convenient viewing anytime on the app.
Bluetooth® connection
Bluetooth® gateway connection
Cloud sync
*After connecting to the Bluetooth® gateway, measurement data is automatically synchronised to the cloud for storage.
Notes:
*DEXA: Dual-energy X-ray absorptiometry (DEXA) is widely recognised as the gold standard for measuring body composition. It is extensively used in hospitals, medical examinations, and other professional institutional settings. By comparing the test data measured with the scale to DEXA, the closer the correlation coefficient is to 1, the more accurate the measurement data indicates. DEXA emits low-level radiation and cannot be used by pregnant women.
* The correlation coefficient ≥0.93 between Xiaomi Body Composition Scale S400 and DEXA for fat mass measurement data: Data comes from the Accuracy Study Test Report of Xiaomi Body Composition Scale S400 Based on Dual-energy X-ray Absorptiometry (DEXA) given by Dr. Meitao and his research team at the China Institute of Sport and Health Science, Beijing Sport University. Test report number: BSU20220389.
*An analysis report of 25 body composition indicators: Body weight, heart rate, BMI, body score, body water content, body hydration, body fat percentage, fat mass, protein mass, protein rate, muscle mass, muscle rate, bone mineral mass, bone mineral rate, visceral fat rate, basal metabolic rate, lean body mass, body type, estimated waist-hip ratio, body age, skeletal muscle mass, weight control, muscle control, fat control, standard weight. Connect to Xiaomi Home app to view the complete body composition report.
*Health for the whole family: It allows users aged 6–80 years to measure body weight, body fat percentage, and other body composition indicators. Children under 6 years old and adults over 80 years old can only measure their weight due to their special physical conditions. The measurement data of adolescents is for reference only due to their rapid growth.
*Store information for up to 36 family members: Each device can be bound to 1 main Xiaomi account. The main account can share the device with 5 Xiaomi accounts using the device sharing function. In addition, the main account and shared accounts can each create 5 virtual users who can each use the device. The scale can store the information of up to 36 users simultaneously. The full range of measurements is supported for the main account, shared accounts, and virtual accounts. Users with a weight deviation within ±2kg cannot be automatically identified and must be manually recognised using Xiaomi Home app.
*Static heart rate monitoring: This refers to the number of heart beats per minute measured while the user is in a calm and motionless state. Xiaomi Body Composition Scale S400 can measure the static heart rate after the body fat measurement. Heart rate monitoring is turned on by default and can be turned off in Xiaomi Home app > Device > Settings.
*Switch mode: Modes can be switched only when the scale is connected to Xiaomi Home app.
*Small object weighing: Small objects refers to objects weighing between 0.1kg to 10kg. The precision of the scale is within 0.1kg and the minimum weight is 0.1kg. For small objects weighing ≤5kg, the scale needs to be stepped on to be woken up, and the object can be placed on the scale when the display shows 0.0kg. Objects weighing >5kg can be placed directly on the scale.
*180-day battery life: Battery life data comes from Yunmai Laboratory and may vary due to differences in specific products, habits of use, and environments during actual use. Please refer to the actual conditions of use. Testing conditions for this product: The scale, powered by 3 AAA batteries, in a at 25°C environment, was used to take weight measurements 3 times per day for approximately 45 seconds each time. The longest battery life observed was 180 days.
*Encouragement for achieving key benchmarks: 'Achieving key benchmarks' means that the measured weight, body fat, and heart rate are within the standard range and a '√' is displayed beside the numerical value. If the values are not within the standard range, they will not be displayed. The body weight benchmark is determined by the BMI calculation and the body fat benchmark is determined by algorithm calculation. A 60–100bpm range is considered normal for heart rate. To determine appropriate body weight and body fat benchmarks, the scale will identify a unique user before calculating and defining the standard range.
*Gateway device: Gateway devices need to be purchased separately. Please go to My > Product Intro > Gateway Guide in Xiaomi Home app for more information about gateway devices.
Notes
· Correct measurement method: It is recommended that the user wear light clothing and perform measurements at the same time and under the same conditions every day. Measurements should be taken in the morning on an empty stomach to obtain more accurate data. Behaviours such as drinking a large amount of water, eating, engaging in intense physical exercise, and taking a shower can affect the measurement results. It is recommended that the user follow the product instructions to ensure proper measurements, as doing so can improve the accuracy of the measurement results.
· This product is not recommended for use by individuals with implanted medical devices (such as pacemakers and cochlear implants). The electrical current used in this product does not cause injury to the human body, but pregnant women should use it with caution. If the user is in a state of discomfort and experiencing symptoms such as fever, cold, gastroenteritis, etc., significant errors may occur when body composition indicators are measured. Measurement results are for reference only.
· Objects weighing less than 10kg will be considered as small objects and their resulting weight measurement data will not be saved. If you need to weigh infants, please use the 'Baby Holder' mode on the app to save their weight.
· This product is not a medical device. The measurement data and results are for reference only. The health data and suggestions provided may vary under different conditions and shall not be used as a basis for diagnosis or treatment.
· Due to real-time changes in product batches and production supply factors, the product images (including but not limited to appearance, colour, and product dimensions), videos, and displays (including but not limited to backgrounds, user interfaces, illustrations, videos) shown on the above page are for illustrative purposes only. Xiaomi may make improvements to the above content to provide accurate product information, specification parameters, and features. Please refer to the actual product for specific information.
· Unless otherwise specified, the dimensions, functions, performance, specification parameters, and other product information mentioned on this page come from Yunmai Laboratory and were obtained under specific testing conditions. They may vary slightly during actual use due to differences in specific products, software versions, conditions of use, and environments. Please refer to the actual conditions of use.
Q&A
What does it mean when I see the prompt 'Bluetooth® gateway not connected'?
1. The Bluetooth® gateway is mainly used to synchronise measurement data when the scale is not connected to the app. When Xiaomi Home app displays the prompt, 'Bluetooth® gateway not connected', it does not mean that the scale is not working, but rather that the scale is not connected to the Bluetooth® gateway device.
2. This function requires a Bluetooth® gateway device at home. If you don't have one, disregard it.
3. After the scale is paired for the first time, please wait for 1–5 minutes for the scale to automatically connect with the gateway. If the connection fails after 5 minutes, please try to reboot the Bluetooth® gateway.
What is a Bluetooth® gateway and what devices are considered gateways?
A Bluetooth® gateway device combines both Wi-Fi and Bluetooth connectivity. It can connect to the Internet on its own and assist Bluetooth® gateway sub-devices in accessing the Internet.
What should I do if I can't search for the scale when I try to add it in Xiaomi Home app?
Please first delete the scale in Xiaomi Home app, and follow the instructions below:
1. Open the battery cover and press the Reset button with an ejection pin for 7 seconds to reset it. Then pair it using Xiaomi Home app. Please note that the scale is not compatible with Mi Fitness app.
2. Please make sure that your smartphone's operating system has been updated to Android 8.0 or iOS 12.0 and later.
3. Please make sure that Xiaomi Home app is updated to iOS 8.7.204 or Android 8.7.703 and later. If you are running an older version, please upgrade or reinstall the app.
How do I connect the scale to Xiaomi Home app?
Follow the steps below to connect for the first time:
1. Gently step on the scale to activate it.
2. Open Xiaomi Home app, tap the '+' icon in the top right corner, select 'Add a device', and choose 'Xiaomi Body Composition Scale S400' from the device list. Wait for the app to find the scale.
3. Select the device you want to connect to, click 'Connect device', and wait for the connection to be completed. If the pairing fails or the device is not found, please press and hold the Reset button with an ejection pin for 7 seconds to reset the scale and try again.
How do I add Xiaomi Body Composition Scale S400 to Mi Fitness app? Is the scale compatible with third-party apps?
Xiaomi Body Composition Scale S400 can only be paired and connected with Xiaomi Home app and is not compatible with Mi Fitness app or any other app.
What should I do if I consistently fail to obtain a measurement result for body fat?
1. Please wipe the soles of your feet and the scale surface with a moist towel and try again.
2. If the problem persists, please connect the scale with Xiaomi Home app and measure it online. Select the member you want to measure in the upper left corner of the 'Device' page in Xiaomi Home app, tap 'Measure', and step on the scale while barefoot as instructed. Make sure both feet are in full contact with the electrode pad to complete a measurement.
What should I do if my family members can't obtain a measurement result for body fat?
1. All users need to first create an account and fill in their information in Xiaomi Home app before measuring their body fat.
2. Currently, the scale can only measure users within a weight range of 20–150kg, a height range of 90–220cm, and an age range of 6–80 years old.
3. Please check if there are weight deviations within ±2kg for the main account, a shared account, or any member account. If so, offline body fat measurement is not supported, and only online measurements can be used.
4. Please make sure that both feet are in proper contact with the electrode pad. It is recommended to wipe the soles of your feet and the scale surface with a moist towel before trying again.