BMI Calculator
Body Mass Index – check if your weight is healthy.
What is BMI and how is it calculated?
Body Mass Index (BMI) is a measure of body fat based on height and weight. The formula is BMI = weight (kg) / [height (m)]². It is used to categorize individuals as underweight, normal weight, overweight or obese, helping to identify potential health risks.
How to use the BMI Calculator
Enter your height in centimeters and weight in kilograms, then click "Calculate BMI". The calculator instantly displays your BMI value and the corresponding weight category (underweight, normal, overweight, or obese).
Understanding Your BMI Result
BMI values are interpreted as follows: below 18.5 – Underweight, 18.5–24.9 – Normal weight, 25–29.9 – Overweight, 30 and above – Obese. These ranges are based on World Health Organization guidelines.
Example calculation
For a person who is 170 cm tall and weighs 65 kg, the BMI is calculated as 65 / (1.7 × 1.7) = 22.5, which falls into the Normal weight category.
Frequently Asked Questions
Is BMI accurate for everyone?
BMI is a general screening tool and may not be accurate for athletes, pregnant women, or the elderly. It does not distinguish between muscle and fat mass.
Can I use this calculator for children?
This BMI calculator is designed for adults. For children and teens, BMI interpretation depends on age and gender percentiles.