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BMI (body mass index)


A formula that uses both weight and height to estimate body fat. For most people, BMI provides a reasonable estimate of body fatness. BMI is frequently used as a quick noninvasive way to screen for weight categories that may lead to health problems. Its biggest weakness is that it doesn't consider individual factors such as bone or muscle mass.

BMI May

  • Underestimate body fat for older adults or other people with low muscle mass
  • Overestimate body fat for people who are very muscular and physically fit
  • Inadequately evaluate health risks of people with excess abdominal fat

Talk with your doctor if you have questions about your BMI.

BMI Calculator



Height: feet inches

Weight: pounds              

Calculated BMI: 0.00

BMI Categories
  • Underweight BMI <18.5
  • Normal weight BMI 18.5-24.9
  • Overweight BMI 25-29.9
  • Obese BMI 30 or greater


Below Normal Weight

Being underweight may weaken your immune system and put you at greater risk of osteoporosis. Talk to your doctor to determine what - if anything - you can do to achieve a healthy weight, or to address unexpected weight loss.

To support good health

  • Snack in between meals to increase the calories in your diet. Healthy snacks - whole-grain crackers, nuts/nut butters and granola.
  • Your doctor may recommend strength training to promote lean muscle development and increase your weight in a healthy way.

Above Normal Weight

Being overweight has linked to a number of medical conditions that can be life-threatening. Consider the benefits of achieving a healthy weight - a reduced risk of serious health conditions such as heart disease, stroke and diabetes, increased energy and improved self-esteem, for example.

To get started

  • Talk with your physician for medical clearance if you have not exercised in a while or if you have any underlying medical problems.
  • Start slow and steady with exercise frequency, duration, and intensity.
  • Embrace healthy eating as a lifestyle by choosing a variety of nutrient-rich foods including fruits, vegetables and whole grains.
  • Set action goals focused on specific healthy activities such as starting a daily food and activity diary.

Whether you are normal weight, above or below your recommended weight My Tray can assist you with your health goals. My Tray allows you to log and track your meals over the course of the day to determine if you have met your nutritional needs. For more information on My Tray click here.