The Fitbit Aria is a body composition scale, so it can measure your weight, body fat %, and body mass index (BMI). The body fat % shows what your body’s composition is in fat vs. lean mass, and while on the scale it will show as a percentage, you’ll have the option to view this data in pounds on your Fitbit.com account. Your BMI is not visible on the scale display but will show on your Fitbit.com account, and it is relative to both your weight and height. Experts have suggested tracking these two additional measures for weight management.

Weight can be measured in lbs, kg and stone, which you can configure online through your device settings.