⚖️ BMI Calculator
Calculate your Body Mass Index and determine your healthy weight range
Calculate your Body Mass Index and determine your healthy weight range
Body Mass Index (BMI) is a standardized screening metric established by the World Health Organization (WHO) to evaluate weight categories relative to height in adult men and women. It provides an immediate indication of whether an individual is underweight, normal weight, overweight, or obese.
Depending on your preferred system of measurement, BMI is calculated using the following equations:
Metric System: BMI = Weight (kg) / [Height (m)]²
Imperial System: BMI = [Weight (lbs) / (Height (in))²] × 703
Step-by-Step Metric Example: For an adult weighing 75 kg with a height of 1.75 meters (175 cm):
| Category | BMI Range (kg/m²) | Health Risk Level |
|---|---|---|
| Underweight | < 18.5 | Moderate to High |
| Normal Weight | 18.5 – 24.9 | Low / Optimal |
| Overweight | 25.0 – 29.9 | Increased |
| Obesity Class I | 30.0 – 34.9 | High |
| Obesity Class II | 35.0 – 39.9 | Very High |
| Obesity Class III (Severe) | ≥ 40.0 | Extremely High |
While BMI is an excellent population-level screening tool, it has notable individual limitations:
Q: What is a healthy weight range for my height?
A: A healthy weight range corresponds to a BMI between 18.5 and 24.9. For a height of 175 cm (5'9"), this equals 56.7 kg to 76.3 kg (125 lbs to 168 lbs).
Q: Should men and women use different BMI formulas?
A: The standard BMI mathematical formula is identical for adult men and women. However, women naturally carry a higher percentage of body fat than men at the same BMI score.