BMI Calculator
A BMI calculator is a free online Body Mass Index calculator that helps you check whether your weight is healthy for your height. It gives you a BMI number that shows if you are underweight, normal weight, overweight, or obese.
Calculate your BMI
Underweight <18.5
Normal 18.5–24.9
Overweight 25–29.9
Obesity ≥30
What is Body Mass Index (BMI)?
Body Mass Index (BMI) is a health screening tool that calculates body fat based on weight and height. It gives you a number that shows whether you are underweight, normal weight, overweight, or obese. Using a BMI calculator helps you understand potential health risks associated with being overweight or obese.
| BMI Category | BMI Range |
|---|---|
| Underweight | Less than 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25 – 29.9 |
| Obesity | 30 or greater |
How is BMI Calculated?
BMI is calculated by dividing the weight of a person (in kg) by the square of their height (in meters).
BMI = weight (kg) / (height (m))²