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Enter your height and weight
Underweightbelow 18.5
Normal weight18.5 – 24.9
Overweight25 – 29.9
Obese30 and above
Height and weight → Body Mass Index and category.
About this calculator
BMI is calculated as weight (kg) ÷ height (m)², or 703 × weight (lb) ÷ height (in)² in imperial units.
It's a quick screening tool, not a diagnosis — it doesn't distinguish muscle from fat, so very muscular people can show a higher BMI without carrying excess body fat. The standard categories are under 18.5 (underweight), 18.5–24.9 (normal), 25–29.9 (overweight), and 30+ (obese).
Frequently asked questions
What is a healthy BMI range?
The standard adult categories are under 18.5 underweight, 18.5 to 24.9 normal weight, 25 to 29.9 overweight, and 30 or above obese.
Is BMI accurate for everyone?
No. BMI only compares height and weight, so it cannot tell muscle from fat and can misclassify very muscular people, older adults, and children. Treat it as a rough screening figure rather than a diagnosis.