Understand your body mass index and what it means for your health
Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight and obesity in adults.
Note: BMI may not be accurate for athletes, pregnant women, or the elderly. Consult a healthcare professional for personalized advice.
The Body Mass Index (BMI) Calculator is a simple and powerful tool to determine whether your body weight is healthy for your height. Use our advanced BMI calculator to instantly find out your BMI score and understand your body category — underweight, healthy, overweight, or obese. This online BMI calculator helps you make smarter health and fitness decisions.
BMI stands for Body Mass Index. It measures body fat using your height and weight ratio. Developed by Belgian mathematician Adolphe Quetelet, BMI remains one of the most trusted indicators of healthy body weight. With our online BMR Calculator and TDEE Calculator, you can also get a complete health overview.
The BMI formula divides your weight in kilograms by the square of your height in meters (kg/m²). Based on your result, you fall into one of four categories: underweight, normal weight, overweight, or obese.
Did you know? BMI alone doesn't define overall health. Use tools like our Calorie Burn Calculator and TDEE Calculator for a complete health analysis.
Use BMI as a starting point, not the final measure. For accurate analysis, combine it with BMR and TDEE data or consult a healthcare professional.
If your BMI is below 18.5, seek advice from a dietitian to reach a healthy range.
To lower BMI: Eat balanced meals, exercise regularly, and use our Calorie Burn Calculator to track daily progress.
To increase BMI: Focus on nutrient-rich foods like nuts, whole grains, and lean proteins.
For people under 20, BMI is evaluated differently using percentile growth charts. For accurate values, consult your pediatrician or use a child-specific BMI Calculator.
A BMI Calculator estimates your body fat using height and weight to identify if you’re underweight, healthy, overweight, or obese.
BMI = weight (kg) ÷ [height (m)]². You can easily calculate it using our online BMI calculator.
For adults, a healthy BMI range is 18.5 to 24.9.
Yes, BMI calculation is the same for both; however, body composition differs slightly.
Yes, but it must be compared using percentile growth charts for accurate results.