Find out if you are healthy and at your ideal weight with the Body Mass Index calculator.Body mass index (BMI) or height weight index; It is a calculation method that shows the estimated fat percentage in a persons body. In this method, the persons height-weight ratio is taken as a basis. According to the result of the index, the closeness and distance of the persons current weight to their ideal weight can be calculated.How to Calculate Body Mass Index?Body mass index is calculated by dividing body weight by the square of height.Results under 18.5: Below ideal weightResults between 18.5 and 24.9: Ideal weightResults between 25 and 29.9: Above ideal weightResults between 30 and 39.9: Well above ideal weight (obese)Results over 40: Well above ideal weight (morbidly obese)