⚖️ Free Calculator
BMI Calculator
Calculate your Body Mass Index instantly using metric or imperial units. See your BMI category and healthy weight range.
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UnderweightNormalOverweightObese
BMI Categories (WHO Standard)
| Category | BMI Range | Health Risk |
|---|---|---|
| Underweight | < 18.5 | Malnutrition risk |
| Normal weight | 18.5 – 24.9 | Minimal |
| Overweight | 25 – 29.9 | Moderate |
| Obese Class I | 30 – 34.9 | High |
| Obese Class II+ | ≥ 35 | Very High |
Frequently Asked Questions
According to the WHO, a healthy BMI is between 18.5 and 24.9. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is considered obese.
BMI = weight (kg) ÷ height² (m²). For imperial units: BMI = 703 × weight (lbs) ÷ height² (inches²).
BMI is a general screening tool and may not be accurate for athletes (high muscle mass), elderly people, children, or pregnant women. Always consult a healthcare provider for a complete assessment.
Our calculator shows your healthy weight range based on BMI 18.5–24.9. This is a general guideline — individual healthy weight depends on many factors including age, gender, and body composition.
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⚠️ Disclaimer: BMI is a general screening indicator, not a clinical diagnosis. It does not account for muscle mass, bone density, ethnicity, age, or sex differences. Do not use these results as a substitute for professional medical advice. Consult a qualified healthcare provider for a proper health assessment.