BMI Equation and Table Chart

WHAT IS BODY MASS INDEX (BMI)?

BMI (Body Mass Index) is a measure for human body shape based on an individual’s mass and height. This calculates an ideal weight range based on height.  The table applies to men and women between the ages of 18 and 65 years.  BMI can be used to indicate if you are overweight, obese, underweight or normal.

HOW TO CALCULATE IDEAL BODY WEIGHT

What is my ideal weight?  A healthy BMI number is between 20 and 25. A score below 20 indicates that you may be underweight; a value above 25 indicates that you may be overweight.  You can use the chart below as well as a  BMI calculator tape measure  to quickly and easily calculate BMI and assess obesity risk.

Visit the store for

  • BMI tape measure
  • Body measurement kits
  • Skinfold calipers, fitness software and more
Economy Skinfold Caliper + BMI Tape Measure Set
$10.00

BMI EQUATION FORMULA

Here is the equation that is used to calculate BMI.  For quick reference you can use the table below.

Metric Units: BMI = Weight (kg) / (Height (m) x Height (m))

English Units: BMI = Weight (lb) / (Height (in) x Height (in)) x 703

BMI TABLE CHART 18 – 65

Use the following BMI table chart to assess obesity risk.
BMI chart table

BMI VS. BODY FAT PERCENTAGE

Both BMI and body fat percentage give valuable health information.  BMI is an equation that gives you a numerical rating of your health based on height and weight. As your BMI goes up, so does your risk of developing weight-related diseases, such as heart disease and diabetes. Research is improving, though, about how body fat percentage relates to disease.  In September 2000, the American Journal of Clinical Nutrition published a study showing that body-fat percentage may be a better measure of your risk of weight-related diseases than BMI.

BMI SCORE

Underweight  = Below 18.5
Normal =18.5–24.9
Overweight  = 25.0–29.9
Obesity = 30.0 and Above

LIMITATIONS OF BMI

  • BMI may overestimate body fat in athletes and others who have a muscular build
  • BMI may underestimate body fat in older persons and others who have lost muscle

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