BMI Calculator

About BMI

Body Mass Index (BMI) is a simple calculation using your weight and height. It was developed in the 1830s by Belgian mathematician Adolphe Quetelet and is widely used as a screening tool — though it has real limitations.

BMI Ranges

Category	BMI Range
Underweight	Below 18.5
Normal weight	18.5 – 24.9
Overweight	25 – 29.9
Obese	30 and above

Limitations of BMI

BMI doesn't distinguish between fat and muscle. A muscular athlete can have a "overweight" BMI while being in excellent health. It also doesn't account for age, sex, or where fat is distributed in the body.

Use BMI as a starting point, not a definitive health verdict. For a fuller picture, talk to a healthcare provider who can assess body composition, blood work, and fitness.

Why maintaining a healthy weight matters

• Excess body fat increases risk of heart disease, type 2 diabetes, and certain cancers
• Being underweight can weaken the immune system and reduce bone density
• Even a 5–10% weight loss in overweight individuals can measurably improve health markers