Body Mass Index (BMI) is a simple, internationally recognized metric used to estimate whether a person has a healthy body weight for their given height. While it does not measure body fat directly, it provides a highly reliable indicator of health risks associated with being underweight, overweight, or obese.
The World Health Organization (WHO) categorizes BMI results as follows:
While our BMI Calculator is a great starting point for assessing general health, it has some limitations. BMI does not differentiate between muscle mass and fat mass. Therefore, athletes or bodybuilders with high muscle mass may have a high BMI but very low body fat. Similarly, it may not be fully accurate for pregnant women, the elderly, or young children.
If you are actively on a fitness or weight loss journey, checking it once every few weeks is reasonable. However, focusing on overall health, diet, and exercise is more important than daily BMI tracking.
Standard BMI calculations are designed for adults (ages 18 and older). Children and teens require a specific BMI percentile chart that accounts for age and gender.