BMI Calculator – Check Your Body Mass Index & Healthy Weight Range

BMI Calculator – Understand Your Body Mass Index

Wondering whether your weight is healthy for your height? Our BMI Calculator (Body Mass Index Calculator) helps you quickly determine your body weight category using internationally recognized health standards. By simply entering your height and weight, you can instantly find out if you fall under underweight, normal weight, overweight, or obesity categories.

This online BMI calculator is designed for convenience and accuracy, supporting both US units (feet, inches, pounds) and metric units (centimeters, kilograms). It follows the official guidelines issued by the World Health Organization (WHO) and the Centers for Disease Control and Prevention (CDC).

BMI Calculator

* Enter Weight in KG or LB, it will auto-convert.

Your BMI Score
Normal BMI range: 18.5 – 25 kg/m²

What Is BMI and Why Is It Important?

BMI, short for Body Mass Index, is a widely used screening tool that estimates body fat based on your height and weight. Although it does not directly measure body fat percentage, it provides a reliable indicator to assess potential health risks related to weight.

With this calculator, you can:

  • Track your weight status over time
  • Understand which BMI category you fall into
  • Identify potential health risks early
  • Make informed decisions about diet and lifestyle

How the BMI Calculator Works

The BMI calculator uses a standard mathematical formula that compares your weight to your height. Based on your input, it produces a numerical BMI value that corresponds to a specific weight category.

Steps to Calculate Your BMI

  1. Enter your height (feet & inches or centimeters).
  2. Enter your weight (pounds or kilograms).
  3. Click on Calculate BMI.
  4. Instantly view your BMI score and weight category.

⚠️ Note: BMI is a general screening tool. For medical advice or diagnosis, always consult a healthcare professional.


BMI Calculator for Children and Teens (Ages 2–20)

BMI calculations for children and teenagers are different from adults. Instead of fixed BMI ranges, children’s BMI is measured using percentiles, taking age and gender into account.

BMI Categories for Children & Teens

CategoryPercentile Range
UnderweightLess than 5%
Healthy Weight5% – 85%
At Risk of Overweight85% – 95%
Overweight95% or above

These classifications are recommended by WHO and CDC.


BMI Table for Adults (18 Years and Above)

According to international health standards, adult BMI categories are as follows:

CategoryBMI Range
Severe ThinnessBelow 16
Moderate Thinness16 – 17
Mild Thinness17 – 18.5
Normal Weight18.5 – 24.9
Overweight25 – 29.9
Obese Class I30 – 34.9
Obese Class II35 – 39.9
Obese Class III40 or above

Understanding Your BMI Score

Your BMI score helps determine your overall weight condition:

  • Low BMI may indicate nutritional deficiencies
  • Normal BMI reflects a healthy body weight
  • High BMI may increase the risk of chronic diseases

These categories are general guidelines and may vary based on factors such as muscle mass, age, gender, and ethnicity.


Health Risks Associated With Being Overweight or Obese

Excess body weight can significantly impact physical and mental health. Common risks include:

Major Health Risks

  • Heart Disease & High Blood Pressure
  • Type 2 Diabetes
  • Stroke & Cardiovascular Issues
  • Osteoarthritis & Joint Pain
  • Breathing Disorders & Sleep Apnea
  • Mental Health Issues (Depression & Anxiety)
  • Chronic Fatigue & Reduced Mobility
  • Increased Mortality Risk

Health Risks of Being Underweight

Being underweight also poses serious health concerns, especially in children and adolescents.

Potential Risks

  • Anemia and poor blood circulation
  • Osteoporosis and fragile bones
  • Delayed growth and development
  • Malnutrition
  • Vitamin and mineral deficiencies
  • Weak immune system
  • Frequent infections

Final Thoughts

A BMI calculator is a simple yet powerful tool to help you understand your weight status and potential health risks. Whether your goal is to maintain a healthy weight, gain weight safely, or reduce excess fat, knowing your BMI is the first step toward better health.

👉 Use the BMI Calculator regularly to monitor your progress and take control of your well-being.