BMI (Body Mass Index) is a measurement of body fat based on height and weight. It is calculated by dividing weight in kilograms by height in meters squared (kg/m²). It helps assess whether a person is underweight, normal weight, overweight, or obese.

What are the BMI categories?

BMI categories are: Underweight (below 18.5), Normal weight (18.5 to 24.9), Overweight (25.0 to 29.9), Obese Class I (30.0 to 34.9), Obese Class II (35.0 to 39.9), and Obese Class III (40.0 and above).

Can I use both metric and imperial units?

Yes! Our BMI calculator supports both metric units (kg and cm) and imperial units (lbs and feet/inches). You can switch between them easily.

BMI Calculator - Calculate Body Mass Index Free

Q: Is BMI accurate for everyone?

BMI is a useful screening tool but has limitations. It does not directly measure body fat or account for muscle mass, age, gender, or ethnicity. Athletes or muscular individuals may have a high BMI without excess body fat. Consult a healthcare provider for a complete assessment.

Q: What is a healthy BMI range?

A healthy BMI range is generally between 18.5 and 24.9. This range is associated with the lowest risk of weight-related health problems. However, individual health depends on many factors beyond BMI.

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Healthy Weight Range

55 - 75 kg

BMI Categories

Category	BMI Range	Status
Underweight	< 18.5	⚠️
Normal	18.5 - 24.9	✅
Overweight	25 - 29.9	⚠️
Obese I	30 - 34.9	🔴
Obese II	35 - 39.9	🔴
Obese III	≥ 40	🔴

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Frequently Asked Questions

What is BMI?

BMI (Body Mass Index) is a measure of body fat based on height and weight. The formula is: BMI = weight(kg) / height(m)². It helps categorize if a person is underweight, normal, overweight or obese.

What is a healthy BMI range?

A healthy BMI range is 18.5 to 24.9. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is considered obese.

Is BMI accurate for everyone?

BMI is a good general indicator but may not be accurate for athletes with high muscle mass, elderly people, pregnant women, or children. Consult a doctor for a complete health assessment.

What is BMR?

BMR (Basal Metabolic Rate) is the number of calories your body needs at rest to maintain basic life functions like breathing, circulation, and cell production. It varies by age, gender, weight and height.

Is my data stored anywhere?

No! All calculations run in your browser. Your health data is never sent to any server. 100% private and secure.