How to Check Xiaomi Scales for Accuracy: A Step-by-Step Guide with Tests and Calibration

Xiaomi’s smart scales are one of the most popular gadgets for home use, but even they can show inaccurate data over time. A 200-500-gram margin of error on the Mi Smart Scale 2 or Xiaomi Body Composition Scale is not uncommon, especially after falls, moves or prolonged use. In this article, we will discuss how to independently check the accuracy of the scales without special equipment, identify system errors and calibrate the device, if possible.

It is important to understand: Xiaomi smart scales (like any electronic scale) have a factory error specified in the characteristics – usually this is the case. ±0.1 kg for models with bioimpedance sensors and ±0.05 But the actual deviations often exceed these values. 5 methods, including comparison with control weights, verification of repeatability of measurements and analysis of data in the Mi application Fit/Zepp Life.

If your scales show a weight of 1-2 kg more or less than the real one, the problem may lie not in the device itself, but in the data processing algorithms (for example, when accounting for clothes or time of day), let’s understand how to distinguish hardware malfunction from software error.

Preparation of the scales for inspection: 3 mandatory steps

Before testing, Xiaomi’s weight accuracy needs to be ruled out by external factors that may distort the results, and even small details like the carpet under your feet or wet feet can add up to 300-400 g of error.

• 📍 Set the scales on a flat, hard surface, tile or laminate is perfect, avoid carpets, soft surfaces, or uneven floors, because the sensors may misallocate the load.
• 🔋 Check the battery power. At a discharge below 20%, some models (such as the Mi Body Composition Scale 2) start to "fail" and show weight with a delay.
• 🧹 Clear the contacts. Dirt or dust on sensory sites (especially on body composition scales) can lead to false positives.

Also, make sure that the scales are not near sources of vibration (washing machine, refrigerator) or electromagnetic interference (router, microwave), which can affect the bioimpedance sensors in models with fat/muscle analysis.

⚠️ Note: If Xiaomi scales show Err or flash indicators after switching on, this is a sign of hardware malfunction (a sensor or board is damaged.

2.The method of control weights: how to check Xiaomi scales with benchmarks

The most reliable way to detect an error is to use weights with known weights.

• 🏋️‍♂️ Sports pancakes (5–20 kg) – their weight is usually indicated on the body.
• 📦 Products labeled: sugar/flour packages (1 kg), water bottles (1.5 liters) = 1.5 kg).
• 💊 Pharmacy weights (100-500 g) - sold in medical equipment stores.

Step-by-step:

1. Weigh the weight on the kitchen scales (mechanical or electronic) and write down the result.
2. Place the weight on the center of the Xiaomi platform (don't shift!) Wait for the readings to stabilize.
3. Compare the values. A difference of more than ±0.2 kg indicates a malfunction.

If the error increases with weight gain (for example, at 1 kg the difference is 10 g, and at 10 kg it is already 300 g), the problem may be the nonlinearity of the sensors, which is typical for cheap models or weights after a fall.

Repeat the test 3 times in a row | Check the scales on another surface |Reset the settings in Mi Fit| Update the firmware (if available) | Contact Xiaomi-->

Verification of repeatability of measurements: stability test

Even if the scales show the “right” weight on the first weigh, they can produce different results when repeated attempts, which is typical for devices with unstable sensors or firmware problems.

How to run the test:

1. Stand on Xiaomi's scale and wait for the weight to be fixed. Write down the result.
2. Get off the scale, wait 5 seconds and repeat weighing 10 times in a row.
3. Compare all 10 readings. A spread of more than ±0.3 kg indicates a malfunction.

Example of normal results: 72.4 kg, 72.5 kg, 72.3 kg, 72.4 kg.

Example of problematic results: 72.4 kg, 73.1 kg, 71.8 kg, 72.9 kg.

⚠️ Note: If Xiaomi scales show rounded values at each weighing (for example, only 72.0 kg, 73.0 kg without tenths), this is a sign of a sensor or processing algorithm failure.

For the Mi Body Composition Scale 2, check the stability of fat, muscle and water percentages, and if these values jump when repeated measurements (e.g., 22% fat, 28%), the problem may be in contact with bioimpedance sensors.

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If Xiaomi scales show a delay in weight (e.g. 5-10 seconds after you stand up), try resetting them to factory settings via the Mi Fit app.

4. Comparison with pharmacy or mechanical scales

If you don't have control weights on hand, you can use a second scale to compare them.

• ⚖️ Mechanical medical scales (inaccuracy) ±0.1 kg).
• 💊 Electronic pharmacy scales (more precisely, but usually up to 150 kg).
• 🏋️ Libras in the gym (if they are calibrated).

The verification algorithm:

1. Weigh on Xiaomi and write down the result.
2. Weigh yourself on the second device (in the same clothes!).
3. Repeat the procedure 3 times and average the difference.

If the difference is consistently greater than ±0.3 kg, Xiaomi scales require calibration or repair. Note: some models (such as the Mi Smart Scale 2) can overstate the weight by 0.5-1 kg due to the algorithms of clothing accounting – this is normal if the difference is constant.

5.Apply verification: Data history analysis

Mi Fit or Zepp Life apps store a weigh-in history that can tell you when the crashes started.

• 📈 Weight loss without objective reasons (for example, +3kg overnight).
• 🔄 Cyclic errors (e.g., each 5th weighing shows a weight of 1 kg less).
• ⏱️ Synchronization delays (data appears in the application after 10 hours)+ minute).

How to analyze the story:

1. Open Mi Fit → Profile → Weight →
2. Select a period of 1 month and look at the chart.
3. If you see abnormalities (for example, weight “jumps” back and forth for no reason), try resetting the weight settings:

Weight settings in Mi Fit → General → Resetting settings

For models with bioimpedance (Xiaomi Body Composition Scale), check the graphs of body composition. If the percentage of fat or muscle changes illogically (for example, in a week without training, fat fell from 25% to 15%), this may indicate a sensor failure.

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If Xiaomi scales are synced with the app but show clearly incorrect data (for example, a weight of 30 kg for an adult), the problem is most likely the firmware. Try updating it through Mi Fit or contact support.

Xiaomi's calibration of scales: is it possible?

Unlike mechanical scales, most Xiaomi smart scales do not support manual calibration, but there are several ways to get accuracy back:

• 🔄 Resetting settings: Open Mi Fit → Choose your scale. Go to Settings. → General. → Reset. After reset, reset the original setup.

Firmware update

Go to Device Profile → Software Update. Up-to-date firmware versions often fix sensor errors.

Physical inspection of sensors

If the scales fell, check if the legs bent. Sometimes it is enough to put a thin cardboard under the problem angle.

There is a hidden calibration mode for Mi Smart Scale 2 and later, but it requires special equipment and is usually only available at service centers. If all methods have not worked, contact Xiaomi with logs from the application (Reviews section).

⚠️ Warning: Do not try to disassemble the scales yourself - this will lead to loss of warranty! There are no adjusting screws inside the device (unlike mechanical scales), and the sensors are customized software.

7.When Xiaomi scales require repair or replacement

If after all the checks, the scales keep lying, it's probably a hardware problem.

• 🚨 Err, Lo or flashing indicators.
• 📉 The margin of error is greater ±1 kg on weight test.
• 🔌 Libras are not switched on or off arbitrarily.
• 📱 Not synced with the application despite the fact that Bluetooth works.

The cost of repairing Xiaomi scales is often comparable to the price of new ones, so it is more logical to consider a replacement if hardware failures.Exception is the premium segment model (for example, Xiaomi Smart Scale 2 Pro), where repairing sensors may be advisable.

Before buying new weights, check:

• 🔍 Reviews of the model in forums (for example, 4PDA or Mi Community).
• 📦 Availability of warranty (in Russia, the official guarantee for Xiaomi scales - 12 months).
• ⚖️ Claimed error (optimum — ±0.1 kg).