how do smart scales work

Smart scales work primarily using a technology called bioelectrical impedance analysis (BIA). When a person steps on the scale, the device sends a very weak and harmless electrical current through the body. This current travels at different speeds through different types of tissues: it moves faster through muscle because muscle contains more water, slower through fat because fat has less water, and even slower through denser bone. By measuring the resistance (impedance) to the current, the scale estimates body composition metrics such as body fat percentage, muscle mass, bone density, and hydration levels. These measurements are combined with personal data like age, gender, and height entered into the scale’s app to calculate more accurate body metrics. The smart scale then transmits the measured data to a smartphone or health app via Bluetooth or Wi-Fi, allowing users to track their health over time. Although smart scales are quite accurate for weight, their body composition readings can vary in precision based on factors like device quality and body positioning. In short, smart scales use electrical resistance to differentiate between fat, muscle, and bone to provide detailed body composition data alongside weight readings.