BMI Calculator

Weight (kg)

Height (cm)

Age (optional)

Your Result

⚖️

Enter your details and click Calculate

Your BMI

—

UnderNormalOverObese

BMI Range	Category	Health Risk
Below 18.5	Underweight	Moderate (malnutrition risk)
18.5 – 24.9	Normal Weight	Low (healthy range)
25.0 – 29.9	Overweight	Moderate
30.0 – 34.9	Obese Class I	High
35.0 – 39.9	Obese Class II	Very High
40.0 and above	Obese Class III	Extremely High

What is BMI?

BMI (Body Mass Index) is a widely used measurement that estimates body fat based on height and weight. It was developed by Adolphe Quetelet in the 19th century and is used by health professionals worldwide as a quick screening tool.

BMI Formula

Metric: BMI = Weight (kg) ÷ Height² (m)

Imperial: BMI = (Weight (lbs) × 703) ÷ Height² (inches)

Limitations of BMI

BMI does not directly measure body fat and may be inaccurate for athletes (high muscle mass), elderly individuals, or pregnant women. Always consult a healthcare provider for a comprehensive health assessment.

Frequently Asked Questions

What is a normal BMI range?

A normal BMI range is 18.5 to 24.9. Below 18.5 is underweight, 25–29.9 is overweight, and 30 and above is obese. Use our BMI Calculator above to check your score.

How to calculate BMI in kg and cm?

BMI = Weight (kg) ÷ Height² (m). First convert height from cm to m (e.g. 170 cm = 1.70 m). Then divide weight by height squared. Example: 70 kg ÷ (1.70 × 1.70) = 24.2 BMI.

Is BMI accurate for Indians?

Studies suggest that Indians and South Asians have a higher risk of metabolic disease at lower BMI values. Some health organizations recommend using lower BMI cutoffs (23 for overweight, 27.5 for obese) for Indian populations.

What is the ideal weight for my height?

Ideal weight depends on your height. Using BMI: Ideal weight = 18.5 to 24.9 × Height² (m). For a 5'6" (168 cm) person: ideal weight range ≈ 52 kg to 70 kg.

⚖️ BMI Calculator