BMI Calculator (Body Mass Index)
Calculate BMI with reverse target weight analysis. Find the exact weight range needed to reach Normal classification based on WHO standards.
About
Body Mass Index (BMI) serves as the primary heuristic for population-level weight screening. While it does not distinguish between adipose tissue and lean muscle mass, it remains the standard metric for initial health assessments and insurance classifications. It correlates height and weight to identify potential health risks associated with underweight or obesity.
This tool goes beyond simple classification by offering a 'Reverse Analysis'. Instead of merely labeling the user, it calculates the specific weight boundaries required to shift into the 'Normal' category. This actionable data provides a concrete target for weight management planning.
Formulas
Standard BMI:
Reverse Calculation (Target Weight):
Reference Data
| Classification | BMI Range (kg/m2) | Risk Profile |
|---|---|---|
| Underweight | < 18.5 | Nutritional Deficiency |
| Normal Range | 18.5 − 24.9 | Low Risk |
| Overweight | 25.0 − 29.9 | Increased Risk |
| Obesity Class I | 30.0 − 34.9 | Moderate |
| Obesity Class II | 35.0 − 39.9 | Severe |
| Obesity Class III | ≥ 40.0 | Very Severe |