BMI Calculator | CalcPro

Weight (lb)

Height

16 18.5 25 30 40

--.-- kg/m²

Calculate your BMI

What is BMI?

Body Mass Index (BMI) is a numerical value calculated from a person's weight and height. It provides a simple way to classify weight status that may indicate health risks related to being underweight or overweight.

How is BMI Calculated?

BMI is calculated using the following formula:

BMI = weight(kg) / height²(m²)

In imperial units, the formula includes a conversion factor:

BMI = [weight(lb) / height²(in²)] × 703

BMI Weight Categories

BMI Range	Weight Category
Below 16	Severe Thinness
16.0 - 16.9	Moderate Thinness
17.0 - 18.4	Mild Thinness
18.5 - 24.9	Normal Weight
25.0 - 29.9	Overweight
30.0 - 34.9	Obese Class I
35.0 - 39.9	Obese Class II
40.0 and above	Obese Class III

Limitations of BMI

While BMI is a useful tool for population-level assessment, it has several limitations:

It doesn't account for muscle mass, bone density, or overall body composition
It doesn't distinguish between fat, muscle, and bone
It doesn't consider where fat is stored in the body
It may not be accurate for athletes, elderly people, or pregnant women

Health Implications

Being in certain BMI categories may increase your risk for health conditions:

Underweight (BMI < 18.5): Malnutrition, vitamin deficiencies, anemia, osteoporosis
Normal Weight (BMI 18.5-24.9): Generally lowest health risks
Overweight (BMI 25-29.9): Heart disease, high blood pressure, type 2 diabetes
Obese (BMI 30+): Heart disease, stroke, sleep apnea, certain cancers, type 2 diabetes

Important Note:

BMI is just one measure of health. It should be used alongside other methods like waist circumference, body fat percentage, and clinical assessments. Always consult with healthcare professionals for a comprehensive evaluation of your health status.