What is a healthy BMI for adults?

For most adults, a healthy BMI is between 18.5 and 24.9. A BMI below 18.5 is considered underweight, 25 to 29.9 is overweight, and 30 or higher is considered obese.

Is BMI the same for men and women?

Yes, for adults aged 20 and older, BMI is calculated using the same formula regardless of gender. However, the interpretation can vary as women generally have more body fat than men at the same BMI.

How accurate is a BMI calculator?

While BMI is a useful screening tool, it does not directly measure body fat. It can misclassify individuals with high muscle mass (like athletes) as overweight, or older individuals with low muscle mass as healthy.

Can I calculate BMI for children with this tool?

This tool is designed for adults (18+). While the formula for children is the same, their results must be compared to age and gender-specific growth charts, which this specific calculator does not provide.

BMI Calculator - Free Body Mass Index Tool

BMI Calculator

Weight (kg)

Height (cm)

Your BMI is

22.5

Normal Weight

What is BMI?

Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is $BMI = kg/m^2$. It is widely used as a general indicator of whether a person has a healthy body weight for their height.

BMI Range	Category
Below 18.5	Underweight
18.5 – 24.9	Normal weight
25.0 – 29.9	Overweight
30.0 or Higher	Obese