BMI Calculator is a free app that allows you to monitor BMI and the percentage of fat in your body.
The body mass index (BMI) is a simple numerical measure from weight and height. Three-zone of BMI exists. The app will indicate to you in which zone you are.
The accuracy of BMI as an indicator of body fat also appears to be higher in persons with higher levels of BMI and body fat. While, a person with a very high BMI (e.g., 35 kg/m2) is very likely to have high body fat, a relatively high BMI can be the result of either high body fat or high lean body mass (muscle and bone).