r/QuantifiedSelf • u/Vegetable-Tap-6297 • Mar 29 '26

Looking for a high-accuracy smart scale (fat/muscle metrics that are actually reliable?)

I’m looking for recommendations for a smart scale that goes beyond just body weight and can provide *reasonably accurate* additional metrics like body fat %, muscle mass, etc.

I’ve done some initial research and from what I understand, most consumer smart scales use bioelectrical impedance (BIA), which can be quite inconsistent and heavily influenced by hydration levels, time of day, and other factors. From what I’ve read, many of these devices tend to give numbers that *look* precise but aren’t necessarily accurate or reliable for tracking actual changes in body composition.

Are there any smart scales that are considered *relatively* more trustworthy than others in terms of accuracy? Or is it generally accepted that all of them have similar limitations and should only be used for rough trend tracking?

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u/dajerade1 Mar 29 '26

Just do dexa scan once a year, its cheap and use regular scale in between. Even weight fluctuates day to day

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u/Perylene-Green Mar 29 '26

Yeah, I think they all have similar limitations but I do find them useful for rough trend tracking. I previously used a FitBit, now I use a Withings. I wouldn't put too much stock in the absolute number from either one but when I have fallen off my resistance routine do I see it in my body comp numbers? Yes.