Calculate your BMI with age-specific standards, percentiles, and healthy weight ranges.
BMI interpretation varies by age group. Below are standard medical charts for Adults, Children & Teens, and Seniors.
For adults aged 20 and above, standard World Health Organization (WHO) BMI ranges apply:
| BMI Category | BMI Range (kg/m²) | Health Risk Level |
|---|---|---|
| Underweight | Less than 18.5 | Risk of nutritional deficiency & weakened immunity |
| Normal Weight | 18.5 – 24.9 | Lowest medical risk profile |
| Overweight | 25.0 – 29.9 | Increased risk for heart issues & hypertension |
| Obesity Class I | 30.0 – 34.9 | High risk for metabolic syndromes |
| Obesity Class II | 35.0 – 39.9 | Very High health risk |
| Obesity Class III | 40.0 or greater | Extremely High risk (Severe Obesity) |
For individuals aged 65 and older, medical research indicates that a slightly higher BMI provides protection against osteoporosis and frailty:
| Age Group | Ideal / Recommended BMI Range | Status Note |
|---|---|---|
| 65 to 74 years | 22.0 – 27.0 kg/m² | Protective against muscle mass loss (Sarcopenia) |
| 75 years & older | 23.0 – 28.0 kg/m² | Optimal longevity weight window |
For children and teens, BMI is evaluated using age-and-gender percentiles compared against growth charts:
| Percentile Range | BMI Category | Action / Medical Guidance |
|---|---|---|
| < 5th Percentile | Underweight | Consult pediatrician for nutrition evaluation |
| 5th to 85th Percentile | Healthy Weight | Maintain balanced active lifestyle |
| 85th to 95th Percentile | Overweight | Encourage healthy food choices & play |
| ≥ 95th Percentile | Obesity | Pediatric health guidance recommended |
This calculator is intended for informational and educational purposes only and should not replace professional medical diagnosis or treatment. Muscle mass, bone density, ethnic background, and fluid retention can influence BMI calculations. Always consult a healthcare professional before initiating weight management programs.