A body composition scale analyzes how electrical signals flow through your body, estimating how much of your total weight is fat-free mass compared to body fat. You may not always get every answer ...

However, the best smart scales can give you a better insight into your overall health by considering your weight, muscle mass, bone density, body fat percentage and even your hydration status.

Smart scales track changes in your muscle mass, body fat percentage and other health metrics — but how do they work?

If you tend to carry more fat in your lower body, smart scales might overestimate your body weight. Likewise, if you experience swelling in your legs, this could throw off the reading.

A new study shows body fat percentage outperforms BMI in predicting early death. Is it time to ditch the scale?

The body fat scales tested by the women included those made by Tanita, Fitbit, Taylor, Withings, Weight Watchers and Qardio. The scales ranged in price from $40 to $150.

In terms of your weight, Withings claims the Body Scan is accurate to within 0.1 pounds (50 grams) or double the previous model, but that's just the start of showing your body makeup.

We’ll start at the very beginning: Body mass index (BMI) is a measure of someone’s weight compared to their height whereas body fat percentage is a measure of how much body fat someone has ...

Scientists compared the measurements obtained with three different models of smart scales with DEXA and found that these devices can underestimate both fat and muscle mass by as much as 8 kg and 8 ...