BMI Calculator

Q: What is a healthy BMI for adults?

According to the World Health Organization (WHO), a healthy BMI for adults falls between 18.5 and 24.9. A score below 18.5 is considered underweight, 25 to 29.9 is overweight, and 30 or higher is considered obese.

Q: Is BMI an accurate measure of body fat?

While BMI is a useful screening tool for populations, it is not a direct measure of body fat. Because it only relies on height and weight, it cannot distinguish between fat and muscle mass. Therefore, heavily muscular athletes may have a mathematically 'overweight' BMI despite having low body fat.

Q: How is BMI calculated?

The mathematical formula for BMI is weight in kilograms divided by height in meters squared (kg/mÂ²). If you use imperial units (pounds and inches), the formula is weight (lb) divided by height (in) squared, multiplied by a conversion factor of 703.

Calculate your Body Mass Index (BMI) and find out your weight category using metric or imperial measurements.

Your Measurements

Unit System

Age

Weight (kg)

Height (cm)

What is a BMI Calculator?

A Body Mass Index (BMI) Calculator is a widely used health screening tool that estimates whether a person has a healthy body weight for a given height. By processing your height and weight through a standardized mathematical formula (kg/mÂ²), the calculator assigns you a numerical score. This score is then matched against the World Health Organization (WHO) categories to determine if you are underweight, normal weight, overweight, or obese.

Understanding BMI Categories

Once you calculate your score, our tool places you into one of the following internationally recognized health categories:

Underweight (< 18.5): Indicates you may need to gain weight. Being underweight can compromise your immune system, cause bone loss, and lead to nutritional deficiencies.
Normal Weight (18.5 - 24.9): This is the ideal, healthy range. Maintaining a normal BMI significantly reduces the risk of serious health conditions like heart disease and type 2 diabetes.
Overweight (25 - 29.9): Indicates excess body weight. Health professionals usually recommend dietary changes and increased physical activity to lower the risk of future health complications.
Obese (â‰¥ 30): People in this category are at a much higher risk for chronic ailments, including cardiovascular diseases, high blood pressure, and joint problems.

Limitations of BMI

While BMI is excellent for generating general public health statistics, it has limitations on an individual level. Because the formula cannot distinguish between fat mass and muscle mass, bodybuilders and highly muscular athletes will often score an "Overweight" or "Obese" BMI despite having extremely low body fat percentages. Similarly, it does not account for age, bone density, or fat distribution. You should always consult a doctor or nutritionist for a complete health assessment.

Frequently Asked Questions

What is a healthy BMI for adults?

According to the World Health Organization (WHO), a healthy BMI for adults falls between 18.5 and 24.9. A score below 18.5 is considered underweight, 25 to 29.9 is overweight, and 30 or higher is considered obese.

Is BMI an accurate measure of body fat?