Here are some useful fitness calculators
This BMI calculator will help you determine your approximate Body Mass Index (BMI), which is a measure of body fat and helps determine if your heart and cardiovascular system may be overworked. Just enter your weight and height to calculate your BMI, BMI classification, and the weight range for the classification.
Every one should know their maximum heart rate (MHR) for exercising safely, which depends on your age. Also enter your fitness goal and let this calculator help determine your target heart rate (THR).
Use your Resting Metabolism (RMR) (also known as Basal Metabolism or BMR) then factor in your activity level to get about how many calories you burn in an average day. You can eat about this many calories per day to maintain your current weight. This calculator uses gender, height, weight, and age to determine your RMR, then makes adjustments depending on the activity level you choose.
Here's a bit of fun - see if you've got what it takes to join Uncle Sam' finest!