I just used one of those scales for the first time that tells you your body fat percentage, how much muscle mass you have, what your metabolism is, and bone mass. how does it know all this from just your height and weight???
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it is making a lot of assumptions about your body type, or using default info about waist size. I do not see how you can separate weight into fat and muscle without waist size.
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I will tell you the smart scales have a VERY rigged system- usually using electrical current. They estimate a bmi off of height/weight, then use the current to measure resistance, and guess a BMI. The catch is, most of them have a range thats something like 15% to 32%, and have VERY hard limits on how low or high their calculation will go. I’m not entirely sure how accurate they are within that range.
It doesn’t.
It knows your weight and the impedance of your body.
The manufacturer takes a whole bunch of people, puts them on the scale to record those two variables, and then they measure those other values other ways.
Then they do a bunch of math and come up with a set of equations to predict those unmeasured values from the weight and impedance. The accuracy is, in general, awful.
However, if you make sure you only use it in the same hydration state, they are sortof okay to measure changes in body fat percentage.
It just runs a small electrical current through your body, which interacts with muscle and fat differently. It then measure the current that comes back, and calculates it against your weight. They give you a very rough number based on that calculation, that they came up with by averaging a bunvh of test subjects. Everyone has a different type of body, with differing bone density and other factors, which makes the calculation less than reliable.
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