Xiaomi scale 2 review: is the S400's dual-frequency reading worth it?
Worth it, if you want a family trend tracker, not a clinical scale
Why the number on your scale never tells the whole story
Picture stepping onto a bathroom scale first thing in the morning, feet cold on the glass, waiting for a single number to load. It tells you what you weigh, but nothing about what actually shifted since last month, fat, water, or muscle. That gap is exactly what anyone reading a xiaomi scale 2 review is really trying to close, and whether 25 extra numbers on a screen actually help answer it.
How dual-frequency BIA gets to 25 body metrics
Here's the bit the listing buries: a scale like this doesn't weigh fat directly, it estimates it by sending a faint, safe electrical current through your feet and measuring how much resistance it meets. Muscle and water conduct that current easily, fat resists it. Cheaper scales send one frequency and stop there, which mostly reads the surface tissue in your feet and calves. The S400 sends two different frequencies, a low one that skims the surface and a higher one that pushes deeper into muscle and torso tissue. Comparing what each one picks up is what lets it split the result into body water, protein, bone mineral, and muscle mass instead of one blurry guess. That's also the reason it can recognize up to 36 people automatically for a family, weigh a baby or pet in a dedicated mode, and still keep the platform simple, a 300mm glass square with a display that stays hidden until you step on it. None of this replaces a real body scan, it just gives you a far more detailed trend to watch over time.
So you're not buying a body fat percentage, you're buying a more detailed trend line, the same imperfect method measured consistently, week after week, so the direction matters more than any single reading. Two frequencies instead of one just means that trend line is built on better information, not a more accurate snapshot of any one day.
Who the Xiaomi S400 scale is for, and who should skip it
Worth it if
- You want the whole family tracked separately without swapping logins
- You care more about a monthly trend than a perfect single reading
- You'd use the extra metrics like water and muscle mass, not just weight
Skip it if
- You need clinical-grade accuracy to compare against a DEXA scan
- You only ever want a plain weight number, nothing else
- You won't weigh in consistently enough for a trend to mean anything
Not for anyone wanting a single, clinically precise body fat number rather than a home trend tracker.
The xiaomi scale 2 review verdict: is the S400 worth it
If you want a household of people tracking weight and body composition trends without fighting over one login, this is a quiet yes. If you're after a clinical-grade number to compare against a real scan, this isn't that, and no bathroom scale is. Step on it the same way each week and let the pattern do the talking.
Amazon shoppers rate it 4.4 out of 5 across 2,540 ratings. That is their number, not ours.
Before you go
Is the Xiaomi body composition scale 2 accurate?
For weight, yes, it's precise to the gram. For body fat and other composition metrics, treat it as a consistent trend tracker rather than a clinical measurement, since hydration and time of day shift bioimpedance readings.
What is the difference between MI scale 2 and S400?
The Mi Scale 2 measures with a single frequency and reports far fewer metrics, while the S400 uses dual-frequency BIA to separate surface and deep tissue readings, which is how it gets to 25 body metrics instead of a handful.
What are common issues with the Xiaomi scale?
Like any bioimpedance scale, readings shift with hydration, recent exercise, or time of day, so it's worth weighing at a consistent time rather than comparing two readings taken hours apart.
Full spec sheet
| Special Features | Body Fat, Bodyweight, Smart, Tare Function |
|---|---|
| Display Type | LED |
| Weight Capacity Maximum | 150 kg |
| Form Factor | floor scale |
| Weigh Scale Type | Floor Scale |
| Measurement Type | Digital |
| Color | white |
| Material Type | Glass Plastic |
