Find the column with your approximate weight listed at the top of the chart. Find the row with your current height (without shoes) listed on the left of the chart. The box where your column and row meet is your approximate Body Mass Index (BMI).
The color of your BMI box indicates your weight class. Any weight class other the Green "Healthy Weight" class has associated weight-related medical problems. The further you are from Green, the more dangerous things can get. You might be eligible for a weight loss surgery if you are in a Red or Dark Red box.