The body mass index (BMI), or Quetelet index, is a heuristicproxy for human body fat based on an individual's weight and height.

Sedentary means a lifestyle that includes only the light physical activity associated with typical day-to-day life. Select if you work in an office or at home and sit most of the day.

Moderately Active means a lifestyle that includes physical activity equivalent to walking about 1.5-3 miles per day at 3-4 mile per hour, in addition to the light physical activity associated with typical day-to-day life. Select if you are on your feet throughout the day, wait tables or clean for 6+ hours.

Active means a lifestyle that includes physical activity equivalent to walking about more than 3 miles per day at 3-4 mile per hour, in addition to the light physical activity associated with typical day-to-day life. Select if your job is labor intensive or if your daily routine consists of heavy lifting and constant movement.