BMI Calculator - Check Your Body Mass Index
Calculate your Body Mass Index (BMI) instantly. Enter your height and weight below to see your BMI value and category. Supports both metric (cm/kg) and imperial (ft/in, lbs) units.
Enter your height and weight to calculate BMI
| Category | BMI Range |
|---|---|
| Underweight | < 18.5 |
| Normal | 18.5 – 25 |
| Overweight | 25 – 30 |
| Obese | ≥ 30 |
BMI is a general indicator of body weight relative to height. It does not account for muscle mass, bone density, or individual health factors. Consult a healthcare professional for a complete health assessment.
Frequently Asked Questions
What is BMI?+
Body Mass Index (BMI) is a numerical value derived from your height and weight. It is calculated as weight in kilograms divided by the square of height in meters. BMI is widely used as a screening tool to categorize weight status.
What are the standard BMI categories?+
The World Health Organization defines four categories: Underweight (BMI below 18.5), Normal (18.5 to 24.9), Overweight (25 to 29.9), and Obese (30 and above). These ranges apply to adults aged 20 and older.
Is BMI accurate for everyone?+
BMI is a general screening tool and does not distinguish between muscle and fat. Athletes with high muscle mass may have a higher BMI despite low body fat. It also may not be equally accurate across all ethnic groups. Use it as one data point, not a definitive health measure.
Does age or gender affect BMI interpretation?+
Standard adult BMI categories are the same for men and women. For children and teens, age- and sex-specific percentile charts are used instead. The optional age and gender fields on this calculator are for your reference only — they do not change the BMI calculation.