Xiaomi Smart Scale 2 is not just a weight-measuring device, it's a full-fledged body composition analyzer that can measure fat percentage, muscle mass, water level, even bone density. But how do you get the most accuracy when measuring body fat? Many users have different readings or don't understand how to interpret the numbers.
In this article, we'll take a step-by-step algorithm to measure fat percentage, explain what factors affect accuracy, and give you recommendations for calibrating the device, learn why readings may differ from professional methods (such as bioimpedance analysis in the clinic), and how to minimize error, and also reveal secrets that the manufacturer does not always specify in the instructions.
If you have just purchased Xiaomi Smart Scale 2 or have been using it for a long time, but you doubt the correctness of the data, this guide will help you understand all the nuances. We will not limit ourselves to basic tips like “stand on the scale with bare feet” – we will dive into the technical details that affect the result.
1.Preparation of Xiaomi Smart Scale 2 scales for the first measurement
Before you start measuring the percentage of fat, you need to adjust the device correctly, and without preliminary preparation, the readings can have an error of up to 5-7%, which makes them useless for tracking dynamics.
First, make sure the scales are calibrated.
- Put them on a flat, hard surface (like tile or laminate) and a carpet or soft coating will distort the results.
- Turn on the scales by pressing the touch button or simply standing on them.
- Wait for the 0.0 sign to appear on the display - this is a signal of readiness for weighing.
Second, check the firmware version in Mi Fit or Zepp Life. Outdated software may not be able to process bioimpedance analysis data correctly. Update firmware through the device settings menu in the app.
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If the scale shows a Lo error when turned on, it means that the battery is discharged. Replace the batteries with new ones (such as AAA) and repeat the calibration.
Finally, add your profile to the app:
- 📱 Install Mi Fit or Zepp Life from the App Store/Google Play.
- 👤 Create an account or sign in with Xiaomi Account.
- ➕ Press "Add device" → Choose Xiaomi Smart Scale 2.
- 📊 Enter the exact data: height, age, gender. An error of 2-3 cm of growth will give an error of 1-2% fat!
2. Step-by-step instruction: how to measure the percentage of fat
Now, let's move on to the measurement itself. Follow this algorithm to get the most accurate data.
Step 1: Stand on the scales with your bare feet, spreading the weight evenly. The feet should touch the electrodes (metal stripes) on the surface of the scales. Socks or tights will create a barrier to the electrical signal!
Step 2. Wait for the weight to stabilize. The display will show body weight first, and in 3-5 seconds, the symbol of percent and the value of percent fat. If the scale shows a dash (-) instead of a number, then you failed to do a bioimpedance analysis. Try again with water on your feet.
Step 3: Once measured, the data is automatically synced to the app. Open Mi Fit to see a detailed report: in addition to fat, there will be muscle, water, visceral fat, etc.
Time of last meal (minimum 2 hours)|Hydration level (drink a glass of water in 30 minutes)|The temperature in the room (optimum 20-25)°C)|Lack of metal jewelry on the feet|Cleanliness of the scale electrodes (wipe with alcohol when contaminated)-->
Important: Xiaomi Smart Scale 2 uses a bioelectric impedance (BIA) technique, which passes a low current through the body and analyzes tissue resistance, and fat and muscle conduct current differently, so you can calculate their ratio.
3.Why can the fat percentage reading be inaccurate?
Many users complain that the scales show an inflated or understated percentage of fat compared to professional methods (for example, caliperometry or DEHA scanning).
1. Daytime and hydration. In the morning after sleep, the water level in the body is minimal, so the percentage of fat will be higher. In the evening, after eating and drinking, the indicator can decrease by 1-3%. To compare the dynamics, measure at the same time!
2. Eating. After a heavy lunch or dinner, blood rushes to the stomach, which distorts impedance. The optimal time to measure is in the morning on an empty stomach or 2-3 hours after eating.
3. Physical activity: After exercise, muscles are saturated with blood and water levels in the body are elevated, this can underestimate the percentage of fat by 2-4 percent. Wait 4-6 hours after intense exertion.
Temperature and humidity: In a hot or cold room, blood circulation changes, which affects accuracy. Ideal conditions: temperature 20-25 ° C, humidity 40-60%.
5. Leg skin condition: Dry or coarse skin increases resistance. Before measuring, moisturize your feet with water or use moisturizer.
Daily |2-3 times a week |1 times a week | Less than once a month | Never measured-->
4. How to interpret the results: Fat percentage rates
And if you get a figure on the display, you need to understand what it means: Fat percentages depend on sex, age and physical activity level. Below is a table of indicative values for adults:
| Category | Men (%) | Women (%) | Description |
|---|---|---|---|
| Essential fat | 2–5 | 10–13 | The minimum necessary for survival. The following is the risk to health. |
| Athletes | 6–13 | 14–20 | Typical of professional athletes. |
| Good form. | 14–17 | 21–24 | The optimal level for health and fitness. |
| Medium level | 18–24 | 25–31 | Acceptable, but there is room for improvement. |
| Elevated fat | ≥25 | ≥32 | Risk of metabolic disease. |
For example, if your scales showed 22% fat and you're a man, that's the "medium level" category. For a woman, that same measure would mean "good shape."
Visceral fat (internal, around the organs) is a separate parameter, which also measures Xiaomi Smart Scale 2. Its rate is 1-12. Excess indicates the risk of diabetes and cardiovascular disease.
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5. Comparison with other methods: How accurate is Xiaomi's scale?
Xiaomi Smart Scale 2 uses bioimpedance analysis (BIA), which is inferior in accuracy to professional methods, but superior in convenience.
- 🔬 DEHA scanning (dual energy X-ray absorptiometry): error ~1-2% Gold standard, but expensive and unaffordable for home use.
- 📏 Caliperometry (measuring the folds of the skin): error ~3-5 percent. Requires skills and a special device.
- 💧 Hydrodensitometry (weighing in water): error ~2-3%. Exactly, but inconvenient.
- ⚖️ Xiaomi Smart Scale 2: The error ~3-7% Depends on the measurement conditions, but enough to track the dynamics.
Xiaomi's main advantage is repeatability. If measured in the same conditions, the scales will show the trend: whether fat decreases over time or not. For absolute values, it's better to go to the clinic, but for home accuracy control Smart Scale 2 is enough.
⚠️ WARNING: If you use a pacemaker or other implanted electronic devices, do not use a bioimpedance scale without consulting a doctor.
6. Common mistakes and how to avoid them
Even experienced users sometimes make mistakes that distort the results.
Mistake 1: Measurement after shower or pool.
Wet skin conducts current better, which lowers the percentage of fat. Wipe your feet dry and wait 10-15 minutes.
Mistake 2: Using a scale on the carpet.
The soft coating deforms under weight, which disrupts contact with the electrodes. Always put the scales on a hard, flat surface.
Mistake 3: Measurement in clothing.
Fabric (especially synthetics) can become electrified and distort impedance, measured naked or in light cotton underwear.
Error 4: Ignoring software updates.
The firmware of the scales affects the calculation algorithms. Check the updates in Mi Fit every 1-2 months.
Error 5: Comparison with other weights.
Each manufacturer uses their own formulas. Xiaomi, Tanita and Garmin can show different numbers for the same real percentage of fat.
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For maximum accuracy, take measurements under the same conditions: in the morning, on an empty stomach, after the toilet, on the same surface, the only way to track the real dynamics of changes in body composition.
7.Alternative ways to measure fat without weights
If you want a second perspective on your body composition, here are a few techniques that can be used in parallel with Xiaomi Smart Scale 2:
1. Photoanalysis (applications like Body Metric or 3D Scanner).
Take a photo of yourself in tight clothing from different angles, and the AI will estimate the percentage of fat, an error of ~5-10%, but convenient for visual control.
2. Measurement of body circumferences.
With the help of centimeter tape measure:
Then use the U.S. Navy formula:
Percentage of fat (male) = 86.010 × log (waist-neck) – 70.041 × log (growth) + 36.76
Percentage of fat (women) = 163.205 × log (waist + hips - neck) - 97.684 × log (growth) - 78.3873. The mirror test.
Stand sideways to the mirror in your underwear.