BMI Calculator
Check your Body Mass Index easily with Metric or Imperial units
Official WHO BMI Categories
Body Mass Index (BMI) is a person's weight in kilograms divided by the square of height in meters. Here is how the World Health Organization classifies BMI results:
| BMI Range | Weight Status |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal / Healthy Weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and Above | Obese |
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Frequently Asked Questions
Is BMI accurate for everyone?
While BMI is a reliable indicator for most people, it does have limitations. It does not directly measure body fat, meaning it may overestimate fat in athletes or individuals with high muscle mass, and underestimate fat in older adults.
How do I calculate BMI manually?
For the metric system, the formula is: BMI = weight (kg) / [height (m)]². For the imperial system, multiply weight in pounds by 703, then divide by height in inches squared.
What are the health risks of a high BMI?
A high BMI is often associated with an increased risk of chronic conditions such as type 2 diabetes, cardiovascular diseases, high blood pressure, and certain types of cancers.