What is a good way to calculate the bmi or body mass index?

BMI: Is defined as body mass in kg divided by the square of your height in meters. If you don't want to do the math or need it in pounds/inches, there are thousands of bmi calculators on the internet or as phone apps.

NHLBI: Try this website: http://www.nhlbi.nih.gov/health/educational/lose_wt/BMI/bmicalc.htm. This gives you an accurate BMI based on your height and weight, and gives you the guidelines for normal, underweight, overweight and obese. Just plug in the numbers.