The body mass index (BMI) is a helpful tool for determining if you are at a healthy weight. It is a single number based on the ratio of your weight to your height. An ideal BMI is less than 25. Because muscle and bone are denser than fat, an athletic or muscular person may have a high BMI, but not be overweight or obese.
There are four categories of BMI:
Underweight = less than 18.5
Normal weight = 18.5 to 24.9
Overweight = 25 to 29.9
Obese = 30 or greater
You can use the chart here to find out your BMI.
FORMULA FOR DETERMINING YOUR CURRENT BODY WEIGHT AND IDEAL BODY WEIGHT
To determine your ideal body weight (IBW):
The first 5 feet of your total height = 100 pounds
For every inch over the first 5 feet add 5 pounds
Your IBW should be within a plus/minus 10-pound range.
For example: A woman who is 5 foot 4:
5 feet = 100 pounds
4 inches × 5 pounds per inch = 20 pounds
100 + 20 = 120 pounds
Plus or minus 10-pound range: 110 to 130 pounds (average 120 pounds)
To convert pounds to kilograms, divide by 2.2
For example: 120 pounds divided by 2.2 = 55 kilograms
Plus or minus 10-pound range: 50 to 59 kilograms