Xiaomi Mi Body Composition Scale 2 is not just a weight measurement device, but a full-fledged body composition analyzer that will show body fat percentage, muscle mass, water level and even bone density in seconds. But many users face problems: the indicators are jumping, the data are not synchronized with the application, and the percentage of fat seems to be overestimated or underestimated. Why is this happening and how to get the most accurate results?
In this article, we will learn how to use Xiaomi Scale 2 for fat measurement, what settings to check in the Mi Fit app (or Zepp Life), and what to do if the data seems inaccurate, and how to decipher the numbers and what to look for when you first use them, if you just bought this scale or have been using it for a long time, but are not sure about the correctness of the indicators, this guide is for you.
What is bioimpedance analysis and how does it work in Xiaomi Scale 2
Xiaomi Mi Body Composition Scale 2 uses bioimpedance analysis technology (BIA) — A method that evaluates the composition of the body by passing a weak electric current through it, and the current travels at different speeds through fat, muscle, bone and water, allowing the device to calculate the percentage of these components.
It is important to understand that the accuracy of the measurements depends on the hydration of the body: even a glass of water drunk before weighing can distort the results by 2-3%.
- 🔋 Electrodes: Scale 2 has 4 electrodes (two on each leg), which improves accuracy compared to models with 2 electrodes.
- 📊 Xiaomi uses its own calculation formulas adapted to Asian and European populations.
- 📱 Synchronization: data is transmitted to the application via Bluetooth, where it is processed according to your profile (gender, age, height).
However, the method BIA There are limitations: it is not suitable for people with pacemakers, pregnant women (after the first trimester) and athletes with extremely low fat percentages (less than 5%), in which cases the error can reach 5-7%.
Step-by-step: how to measure the percentage of fat on Xiaomi Scale 2
To get the right data, you don't just have to stand on a scale, you have to prepare yourself and take a few steps.
- Install the application: Download Mi Fit (Android/iOS) or Zepp Life (new name for some regions) sign up or sign in via Xiaomi account.
- Add the scales to the app: Open Profile → Devices → Add the device. Select the scale. → Mi Body Composition Scale 2. Follow the instructions on the screen (turn on Bluetooth!).
Fill in the profile
height, weight, age and gender
Preparation for measurement
Stand on the scale barefoot (feet dry!)|Don’t drink water for 30 minutes|Empty the bladder|Remove socks and heavy clothing-->
Measurement process
- Stand on the scale with both legs, spreading the weight evenly.
- Don’t move or talk, the analysis will take 5-10 seconds.
- Wait for the beep and check the data in the application.
If the scales are not synchronized with the phone, check:
- 📱 Bluetooth is on and the scales are within a radius of 2 meters.
- 🔄 Mi Fit app has location access (required for Bluetooth on Android 6)+).
- 🔋 Battery in the scales is not discharged (charge indicator is displayed in the application).
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If the percentage of fat seems to be inflated, try weighing yourself 2-3 hours after exercise – the muscles accumulate water, which distorts the results.
Decoding indicators: what does the percentage of fat in the application mean
In the Mi Fit app, you'll see a few key metrics, but the most talked about metric is body fat percentage, which is based on sex, age and activity level. Here are the approximate values for adults (according to the data). WHO and ACSM):
| Category | Men (%) | Women (%) | Evaluation |
|---|---|---|---|
| Essential fat (minimum for life) | 2–5 | 10–13 | ❗ Dangerous to health. |
| Athletes | 6–13 | 14–20 | ✅ Great. |
| Good physical form. | 14–17 | 21–24 | ✅ Norma. |
| Medium level | 18–24 | 25–31 | ⚠️ Correction recommended |
| High/dangerous level | ≥25 | ≥32 | ❌ Health risks |
In addition to the percentage of fat, Xiaomi Scale 2 displays:
- 💪 Muscle mass: ideal for men - 35-45% of total weight, for women - 30-40%.
- 💧 Water level: 45-65% normal, below 45% dehydration.
- 🦴 Bone mass: should be stable.Abrupt changes may indicate health problems.
- ⚖️ Visceral fat: internal fat around organs, up to 10 (on the Xiaomi scale), above 15, the risk of diabetes and heart disease.
⚠️ Note: If your percentage of fat in the app has changed dramatically overnight (e.g., from 22% to 28%), don't panic:
- 🍕 Overeating salty foods (water retention).
- 🍷 Alcohol use (dehydration).
- 🏋️ Intensive training the day before (muscle inflammation).
Repeat the measurement in 2-3 days under standard conditions.
Frequent mistakes and how to avoid them: why Xiaomi Scale 2 scales lie
Many users complain that the scales show unrealistic data — for example, the percentage of fat in an athlete is 30% or 10% in a person who is obviously overweight. 90% of the time, the problem is incorrect preparation or settings.
Why do the scales show different weights when weighing again?
- 👟 Weighing in clothes / shoes: even light socks will add 50-100 g, and jeans - up to 500 g.
- 🕒 Different measurement times: in the morning, the percentage of fat is higher (due to night dehydration), in the evening - lower (due to accumulated water).
- 📱 Unsynchronized profile: If the application indicates an incorrect height or age, the algorithm will give incorrect data.
- 🔋 Discharged battery: with a low charge, the scales can "glutch" - show zeros or inflated values.
Another common problem is that scales don't store data or are reset, and this happens when:
- You have stood on the scales of the wrong user (up to 16 profiles can be added in the application).
- Bluetooth shut down during transmission (check the power saving settings on the phone).
- The application is not updated (in older versions there are bugs with synchronization).
⚠️ If the scales consistently show a fat percentage above 40% with a normal BMI, check:
- Do you have a sleeve or a sleeve or a sleeve?
- Whether you are using a foot cream (fat texture interferes with contact with electrodes).
- Does the profile indicate the wrong gender (algorithms for men and women are different)
Comparison with other methods: how accurate the scales Xiaomi Scale 2
Users often ask: can you trust the performance of Xiaomi Scale 2 or better use professional methods?
| Method | Accuracy (%) | Cost | Pluses | Cons |
|---|---|---|---|---|
| Xiaomi Scale 2 (BIA) | ±3–5% | 2-3 thousand rubles. | Convenience, speed, data history | Depends on hydration, the error in obesity |
| Kaliperometry (forceps) | ±3–4% | Free of charge./500 ruble. | No need for technical equipment. | Depends on the meter's experience |
| Densitometry (under water) | ±1–2% | 3-5 thousand rubles. | High precision | Expensive, uncomfortable. |
| DEXA (x-ray) | ±1% | 5-10 thousand rubles. | The most accurate | Radiation load, rarely available |
As you can see, Xiaomi Scale 2 is losing out on professional methods in accuracy, but it is winning in terms of convenience and regularity of measurements, and the main thing is to use them to track dynamics, not absolute values. For example, if in a month the percentage of fat has decreased from 28% to 25%, this is objective progress, even if the real value is 26%.
To improve accuracy, you can:
- 📅 Weigh yourself at the same time (e.g. every morning after the toilet).
- 📊 Compare the trend over 7–14 days, not individual measurements.
- 🏥 Every 3-6 months, be checked by a professional method (for example, calibration) for calibration.
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What matters for an objective assessment of body composition is not the absolute accuracy of one measurement, but the dynamics of changes over the week/month. If fat percentage is steadily declining, you are on the right track!
Tips for maximum accuracy: how to calibrate the scales Xiaomi Scale 2
If you want the scales to show the closest to reality data, follow these tips:
- Update the firmware of the scales: Open Mi Fit → Profile → Mi Body Composition Scale 2 → Update firmware. The latest version (at 2026) is 1.5.6, which improves fat algorithms.
- Calibrate the scales manually: How to lose the scales to the factory settings? Press and hold the button on the back of the scale for 5 seconds until the indicator blinks. Then reconnect them in the application. Stand on the scales with a pre-known weight (for example, a weight of 20 kg). If the readings differ by more than 0.3 kg, contact Xiaomi support - a defect in the sensors is possible.
- Use "Athlete Mode" (if you are engaged in strength training): → Profile → Target audience, select an Athlete, and that will adjust the algorithm to account for increased muscle mass.
Synchronize data with other devices
- Connect Mi Band or Amazfit – this will add pulse and activity data for more accurate analysis.
If after all the manipulations, the scales still show unrealistic data (for example, 50% fat percentage at a BMI of 22), it may be a hardware malfunction.
- Check the scales on another smartphone.
- Reset the settings to factory (see spoiler above).
- Contact the service center (Scale 2 – 12 months warranty).
Alternative Apps for Xiaomi Scale 2: Whether to Use
Many users are unhappy with the official Mi Fit app because of limited statistics or advertising, and there are alternatives that can better visualize the data:
- 📊 Google Fit: Syncs with Mi Fit via Settings → Connected apps. Pros: easy graphics, integration with other devices. Cons: no detailed analysis of body composition.
- 🍎 Apple Health (for iPhone): Automatically imports data from Mi Fit. Pros: reliable data storage, compatibility with other fitness applications.
- 📈 Yazio or FatSecret: Uses Xiaomi Scale 2 data to calculate calorie intake. Pros: personalized nutrition recommendations. Cons: requires manual input of certain parameters.
But there's a caveat: alternative applications don't count fat percentages, they just show the weights, and if the baseline is inaccurate, it'll be the same in other software, so you can set up Mi Fit first, and then export the data.
⚠️ Note: When using third-party apps, turn off automatic sync with Mi Fit if you don't want to duplicate records.