Calculate your Body Mass Index (BMI) to check if you're a healthy weight.
The Body Mass Index (BMI) is a widely used screening tool to identify whether a person is at a healthy weight for their height. While it does not measure body fat directly, research has shown that BMI is moderately correlated with more direct measures of body fat. Our Online BMI Calculator provides a quick and easy way to determine your status using both metric and imperial units.
The BMI formula is simple math based on your height and weight. In the metric system, the formula is weight (kg) / [height (m)]². In the imperial system, it's 703 x weight (lbs) / [height (in)]². Our tool handles all these calculations for you instantly.
For most adults, an ideal BMI is in the 18.5 to 24.9 range. Below are the standard categories defined by the World Health Organization (WHO):
| BMI Range | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal Weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and Above | Obese |
Maintaining a healthy BMI is associated with a lower risk of various health conditions, including heart disease, type 2 diabetes, high blood pressure, and certain cancers. It serves as an initial indicator that can prompt further discussions with healthcare professionals about nutrition, exercise, and overall wellness.
BMI is a general screening tool and has limitations. It may not be accurate for athletes with high muscle mass, pregnant women, or the elderly. It should be used as a guide, not a definitive medical diagnosis.