BMI Calculator

Longevity Lifestyle Matters

Research has shown that BMI correlates to direct measures of body fat, it is a fairly reliable indicator of body fat based on height and weight. For adults 20 years old and older, BMI is interpreted using standard weight status categories that are the same for all ages and for both men and women. At the same BMI, women tend to have more body fat than men, older people, on average, tend to have more body fat than younger adults. Highly trained athletes may have a high BMI because of increased muscularity rather than increased body fatness. BMI is not a diagnostic tool. However, is often used to screen for weight categories that may lead to health problems. It is important to remember that BMI is only one factor related to risk for disease. For assessing someone’s likelihood of developing overweight- or obesity-related diseases, the National Heart, Lung, and Blood Institute guidelines recommend looking at two other predictors:

  • The individual’s waist circumference (because abdominal fat is a predictor of risk for obesity-related diseases).
  • Other risk factors the individual has for diseases and conditions associated with obesity (for example, high blood pressure or physical inactivity).

Now, let’s figure out your Body Mass Index (BMI). Calculating your BMI is one of the best methods for assessment of overweight and obesity. Use the BMI calculators provided to determine your specific BMI. Once you know your BMI, you can compare that number with the following general categories for an idea of your health risks:

Calculate Your BMI

Your BMI is

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Underweight

Normal weight

Overweight

Obesity

BMI below 18.5

BMI between 18.5-24.9

BMI between 25-29.9

BMI of 30 or greater

The BMI ranges are based on the relationship between body weight and disease and death. It is important to remember that weight is only one factor related to risk for disease. If you have questions or concerns about the appropriateness of your weight, you should discuss them with your healthcare provider.

  • Hypertension
  • Dyslipidemia (for example, high LDL cholesterol, low HDL cholesterol, or high levels of triglycerides)
  • Type 2 diabetes
  • Coronary heart disease
  • Stroke
  • Gallbladder disease
  • Osteoarthritis
  • Sleep apnea and respiratory problems
  • Some cancers (endometrial, breast, and colon)

Click to download BMI Log Form as a pdf file to track your progress.   Calculation of BMI For those of you who are interested in the calculation formula for the BMI calculator see the information below.

 

Measurement Units  Formula and Calculation
Kilograms and meters (or centimeters) Formula: weight (kg) / [height (m)]2With the metric system, the formula for BMI is weight in kilograms divided by height in meters squared. Since height is commonly measured in centimeters, divide height in centimeters by 100 to obtain height in meters.Example: Weight = 68 kg, Height = 165 cm (1.65 m) Calculation: 68 ÷ (1.65)2 = 24.98
Pounds and inches Formula: weight (lb) / [height (in)]2 x 703Calculate BMI by dividing weight in pounds (lbs) by height in inches (in) squared and multiplying by a conversion factor of 703.Example: Weight = 150 lbs, Height = 5’5″ (65″) Calculation: [150 ÷ (65)2] x 703 = 24.96