Body Mass Index (BMI) Calculator
Calculate your BMI score, healthy target weight range, and WHO classification in Metric or Imperial units instantly with full browser privacy.
Enter Your Measurements
cm
kg
💡 Tip: Changes calculate in real-time as you type. Your data stays 100% on your device.
Your BMI Score
Underweight
Normal
Overweight
Obese
Healthy Weight Target (18.5 - 24.9):
56.7 - 76.3 kg
BMI Prime (Ratio to 25.0):
0.91
Ponderal Index:
13.06 kg/m³
⚠️ Medical Disclaimer: Body Mass Index (BMI) is a screening metric and does not differentiate between muscular body composition, bone mass, age, or ethnicity. Consult a physician for clinical health assessments.
World Health Organization (WHO) BMI Categories
The international standard weight classification for adult men and women aged 20 and older.
| Classification Category | BMI Range (kg/m²) | Health Risk Profile |
|---|---|---|
| Severe Underweight | < 16.0 | Substantial risk of malnutrition and bone loss |
| Moderate Underweight | 16.0 – 16.9 | Elevated risk of nutrient deficiencies |
| Mild Underweight | 17.0 – 18.4 | Mild risk of reduced immune function |
| Normal / Healthy Weight | 18.5 – 24.9 | Lowest clinical risk of weight-associated chronic diseases |
| Overweight (Pre-obese) | 25.0 – 29.9 | Increased risk of hypertension and cardiovascular strain |
| Obese Class I (Moderate) | 30.0 – 34.9 | High risk of type 2 diabetes and metabolic syndrome |
| Obese Class II (Severe) | 35.0 – 39.9 | Very high risk of serious cardiovascular conditions |
| Obese Class III (Very Severe) | ≥ 40.0 | Extremely high morbidity and mortality risk |