What is BMI?
BMI (Body Mass Index) is a measurement that uses your height and weight to determine if you're at a healthy weight for your height. It's a simple screening tool that can indicate whether you're underweight, normal weight, overweight, or obese.
While BMI doesn't directly measure body fat, it correlates with more direct measures of body fat and provides a reliable indicator for most people. Our BMI calculator makes it easy to calculate your BMI and understand what it means for your health.
How to Calculate BMI
BMI is calculated using a simple formula based on your height and weight:
For example, if you weigh 70 kg and are 1.75 m tall:
For imperial measurements (pounds and inches):
Our calculator automatically handles all unit systems.
BMI Categories
Underweight (BMI less than 18.5)
Being underweight may indicate malnutrition, eating disorders, or other health issues. Consult with a healthcare provider if you're underweight.
Normal Weight (BMI 18.5 to 24.9)
This range is associated with the lowest risk of health problems. Maintaining a healthy weight reduces your risk of many chronic diseases.
Overweight (BMI 25 to 29.9)
Being overweight increases your risk of developing health problems like heart disease, diabetes, and high blood pressure.
Obese (BMI 30 or higher)
Obesity significantly increases your risk of many serious health conditions. Consult with a healthcare provider for guidance on weight management.