BMI Calculator.
Calculate your Body Mass Index using your height and weight and understand what your result may indicate.
What Is BMI?.
Body Mass Index compares body weight with height. It is a quick screening measure used to group results into broad weight categories, not a diagnosis or a complete assessment of health.
How Is BMI Calculated?.
The metric formula is BMI = weight (kg) ÷ height² (m). Imperial measurements are converted before the same calculation is applied.
BMI Categories.
| Category | BMI |
|---|---|
| Underweight | Below 18.5 |
| Healthy Weight | 18.5–24.9 |
| Overweight | 25.0–29.9 |
| Obesity | 30.0 and above |
What Does Your BMI Mean?.
The categories describe population-level ranges. A result outside the healthy range can be a reason to look at the wider picture with a qualified healthcare professional, but it does not diagnose any condition.
Limitations of BMI.
BMI does not distinguish muscle from fat, account for bone mass, describe body composition or show where fat is distributed. Athletes and highly muscular people may have a high BMI despite relatively low body fat.
BMI vs Body Fat Percentage.
BMI relates total weight to height, while body fat percentage estimates how much of your body weight is fat. Explore the difference with our Body Fat Calculator.
Frequently Asked Questions.
What is a healthy BMI?+
For most adults, 18.5 to 24.9 is commonly described as the healthy range.
Is BMI accurate?+
BMI is useful for broad screening, but it does not capture every aspect of individual health.
Does BMI measure body fat?+
No. BMI uses only height and weight.
Can muscular people have a high BMI?+
Yes. Muscle can raise body weight without indicating high body fat.
Is BMI different for men and women?+
The adult formula is the same, though body composition can differ.
How often should I calculate my BMI?+
Occasional recalculation is usually enough unless your weight changes meaningfully.