Xiaomi smart scales have long been the standard for health and fitness professionals, but a variety of models, from the budget Mi Scale 1 to the advanced Mi Body Composition Scale 3, often baffles customers. What are the real differences between them? Which model is suitable for home use and which is for professional body composition control?
In this article, we’ll break down all of Xiaomi’s current scale models, compare them by 10 key parameters, from measurement accuracy to app compatibility. You’ll learn which scales support Bluetooth 5.0, which can measure muscle mass and water levels, and which are limited by basic functionality.
If you're choosing between models, or if you want to know whether to upgrade from the old version, this guide will help you make an informed decision, starting with a review of the lines, and then moving on to a detailed comparison.
1. Xiaomi smart scales: who is who
Xiaomi scales are divided into three main series, each of which is aimed at a different audience:
- 🔹 Mi Scale (1/2/3) are low-end models with a basic set of functions, suitable for daily weight control and BMI, but not for analyzing body composition.
- 🔹 Mi Body Composition Scale (1/2/3) — Advanced scales with bioimpedance analysis, measuring percentage of fat, muscle, water, bone mass, and even visceral fat.
- 🔹 Smart Scale 2 is a hybrid variant with a focus on design and minimalism, supporting basic bioimpedance, but inferior to Body Composition in accuracy.
Importantly, despite the similarities, the Mi Scale 3 and Mi Body Composition Scale 3 are different devices with fundamentally different beginnings. The former work on the principle of strain gauges, the latter combine strain gauges with 4 electrodes for bioimpedance.
There are also MiJia-branded scales (such as the MiJia Bluetooth Body Fat Scale), which are essentially a rebranding of the Mi Body Composition Scale 1. Their difference is only in the logo and configuration (sometimes go without a power adapter).
2. Key technical differences: comparison table
So to keep the specs from getting confused, we've put the basic parameters of all the models in one table, and look at the "Type of Sensors" and "Maximum Weight" columns, which are the critical parameters when you choose them.
| Model | Type of sensor | Max. Weight. | Bluetooth | Bioimpedance | User autodetermination | Price (2026) |
|---|---|---|---|---|---|---|
| Mi Scale 1 | Tenzo sensors (G-sensor) | 150 kg | 4.0 | ❌ No. | ❌ No. | ~1 500 ₽ |
| Mi Scale 2 | Tenzosensors (improved) | 150 kg | 4.2 | ❌ No. | ✅ Yes (up to 16 users) | ~2 000 ₽ |
| Smart Scale 2 | Tenzo sensors + 2 electrodes | 150 kg | 5.0 | ✅ Basic (fat/muscle/water) | ✅ Yes (up to 16 users) | ~2 500 ₽ |
| Mi Body Composition Scale 2 | Tenzo sensors + 4 electrodes | 150 kg | 5.0 | ✅ Extended (13 parameters) | ✅ Yes (up to 16 users) | ~3 500 ₽ |
| Mi Body Composition Scale 3 | Tenzos + 4 electrodes (improved) | 200 kg | 5.1 | ✅ Extended (17 parameters) | ✅ Yes (up to 16 users) | ~4 500 ₽ |
The table shows that the Mi Body Composition Scale 3 is the only model with an increased weight limit (200 kg) and Bluetooth 5.1 support, which provides a more stable connection with the smartphone, and only this model can measure protein levels and basal metabolism (BMR).
⚠️ Warning: If your weight is over 150 kg, Mi Scale 1/2 Smart Scale. 2 They just won't stick in or they'll show an error. 3.
3. Measurement accuracy: myths and reality
The manufacturer claims an error of ±50g for all models, but in practice it depends on the conditions of use.
- 📏 Smooth surface: Libras should be placed on a hard floor (tile, laminate flooring) and carpet or soft coating distorts readings.
- 💧 Foot humidity: Wet or sweaty feet disrupt electrode conduction in bioimpedance models (especially for Smart Scale 2).
- 🔋 Battery charge: When the discharge is below 20%, the accuracy drops by 10-15%. Mi Scale 1 generally stops synchronizing at low charge.
- 📱 Smartphone Distance: For Bluetooth 4.0/4.2, the maximum distance is 5 m without obstacles. Bluetooth 5.0/5.1 works more stable at distances up to 10 m.
According to independent lab tests (e.g. RTINGS.com), the real error is:
- Mi Scale 1/2: ±100-150 g (without bioimpedance)
- Smart Scale 2: ±150-200g (due to simplified bioimpedance)
- Mi Body Composition Scale 2/3: ±50-100g (most accurate)
Fun fact: The Mi Body Composition Scale 3 uses machine learning algorithms to adjust readings, for example, if you weigh yourself after a workout, the scale automatically takes into account the temporary increase in muscle mass due to blood flow.
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Before the first use, put the scales on a flat surface and press them with your foot - this will reset the internal calibration of the sensors.
4. Bioimpedance analysis: what scales can do and how accurate it is
Bioimpedance models (Smart Scale 2, Mi Body Composition Scale 2/3) analyze body composition by passing a weak electric current through the legs.
What is measured:
- 💪 Muscle mass: Shows the percentage of muscle in the body. Useful for athletes, but accurate ±1-1.5%.
- 🍗 Fat percentage: Estimates subcutaneous and visceral fat, margin of error up to ±2%.
- 💧 Water level: Important for controlling dehydration. Mi Body Composition Scale 3 adds intracellular water analysis.
- 🦴 Bone mass: Bone density index, useful for osteoporosis prevention, but not a substitute for medical diagnosis.
- ⚡ Basal metabolism (BMR): Only in the Mi Body Composition Scale 3. Shows how many calories the body spends at rest.
Limitations of the method:
- 🚫 Do not work with pacemakers or pregnant women.
- 🍷 Indications are distorted after drinking alcohol (by 10-15%).
- 🕒 To be accurate, weigh at the same time (preferably on an empty stomach in the morning).
Important: Bioimpedance scales are not a substitute for medical tests; their data are indicative and depend on hydration, time of day, and even the phase of the menstrual cycle (in women).
Why do scales show different percentages of body fat in the morning and evening?
5. Compatibility with Xiaomi applications and ecosystem
All Xiaomi scales work with the official Mi Fit app (Android/iOS), but there are differences in integration:
Mi Fit:
- 📊 Supports measurement history, charts and goals (e.g., "reset 5 kg per month").
- 🤝 Syncs with Google Fit, Apple Health, Strava.
- 👨👩👧👦 Allows you to create profiles for the whole family (up to 16 users).
Limitations:
- 🚫 Mi Scale 1 does not support automatic user identification – you need to select a profile manually.
- 🔄 The Smart Scale 2 does not export data to CSV (unlike the Mi Body Composition Scale 2/3).
- 📱 The Mi Body Composition Scale 3 requires Mi Fit version 5.0+ (older smartphones may not support it).
The scales are also integrated with other Xiaomi devices:
- 🏃♂️ Data from the scales are automatically fed into the Mi Band or Amazfit for comprehensive activity analysis.
- 📅 You can set up weigh-in reminders via Mi Home (e.g. every Monday at 7:00).
⚠️ Warning: If you're using Mi Scale 2 with an iPhone, there may be a sync issue due to iOS restrictions on Bluetooth background work.Solution: Open the Mi Fit app before weighing in.
Install on a flat surface | Connect to Mi Fit via Bluetooth | Create a profile with real data (age, height) | Weigh at the same time (in the morning on an empty stomach) | Do not drink water 30 minutes before the measurement-->
6. Design and practicality: what to look for
Externally, all scales Xiaomi look minimalist: glass surface, thin body, LED- display.
Materials:
- 🔲 Mi Scale 1/2: Tempered glass thick 6 mm. Scratch resistant but slid on wet floors.
- 🟥 Smart Scale 2: Anti-slip glass (but less durable).
- 🔵 Mi Body Composition Scale 2/3: glass + aluminum body, the heaviest (1.8 kg) and the most stable.
Display:
- 📺 Mi Scale 1: monochrome LED, shows only weight.
- 🎨 Mi Scale 2 and later: color LED backlit. Represents weight, fat percentage, weather (if synchronized with Mi Home).
Food:
- 🔋 All models run on 4 batteries AAA. Mi Body Composition Scale 3 has the most capacious battery (up to 12 months of operation).
- ⚡ Mi Scale 1 is discharged faster than others due to the outdated Bluetooth 4.0.
Practical advice: if you have children or elderly people in the house, choose models with anti-slip coating (Smart Scale 2 or Mi Body Composition Scale 3). Mi Scale 1/2 can be traumatic on the tile floor.
7. Which model to choose: recommendations on budget and tasks
The choice depends on your goals and willingness to pay for additional features.
For basic weight control (budget up to 2,000 ₽):
- ✅ Mi Scale 2: User Autodetermination, Exact Weight, Synchronization with Mi Fit.
- ❌ Mi Scale 1: is outdated, no autodefinition, Bluetooth 4.0.
For fitness and bioimpedance (budget 2,500–3,500 ₽):
- ✅ Smart Scale 2: Basic Body Composition Analysis, Bluetooth 5.0, Stylish Design.
- ✅ Mi Body Composition Scale 2: 13 parameters of analysis, high accuracy, suitable for athletes.
For professional control (budget from 4,000 ₽):
- ✅ Mi Body Composition Scale 3: 17 parameters, 200 kg limit, Bluetooth 5.1, protein analysis and BMR.
Special cases:
- 🏋️♂️ Bodybuilders: Mi Body Composition Scale 3 (analysis of muscle mass and intracellular water).
- 👵 Seniors: Smart Scale 2 (anti-slip coating) or Mi Body Composition Scale 3 (large numbers on the display).
- 👨👩👧👦 Families: Any model with user self-identification (except Mi Scale 1).
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If you need scales for medical monitoring (such as diabetes or heart disease), it's best to opt for specialized devices from Omron or Tanita. Xiaomi scales are not certified as medical equipment.