BMI Calculator (IMC)
Instantly calculate your Body Mass Index (BMI / IMC) to evaluate your weight category and potential health risks. Free, accurate health tool for adults.
Calculate Your Body Mass Index
Enter your height and weight to get an instant evaluation of your BMI (IMC), weight category, and personalised health insights based on World Health Organization (WHO) guidelines.
Measurement Details
Enter your current height and weight to calculate your BMI
Health Evaluation
Calculated BMI metrics and category
BMI (IMC) Categories
Standard Body Mass Index categories for adults based on World Health Organization (WHO) guidelines.
| Classification | BMI (IMC) Range | Health Risk | Recommended Action |
|---|---|---|---|
| Underweight | < 18.5 | Low (but risk of other clinical problems increased) | Consult a doctor or dietitian |
| Normal weight | 18.5 – 24.9 | Average | Maintain a balanced diet and exercise |
| Overweight | 25.0 – 29.9 | Increased | Adopt healthier eating habits and increase activity |
| Obesity Class I | 30.0 – 34.9 | Moderate | Consult a healthcare professional for a management plan |
| Obesity Class II | 35.0 – 39.9 | Severe | Seek medical advice for structured weight management |
| Obesity Class III | ≥ 40.0 | Very Severe | Immediate medical consultation recommended |
BMI & IMC FAQ
Everything you need to know about Body Mass Index, weight categories, and health metrics.
BMI stands for Body Mass Index, and IMC is its French and Spanish equivalent (Indice de Masse Corporelle / Índice de Masa Corporal). It is a simple calculation using a person’s height and weight to estimate body fat and categorize weight status.
BMI is calculated by dividing your weight in kilograms by the square of your height in metres. The formula is: BMI = weight (kg) / [height (m)]².
For most adults, a healthy BMI range is between 18.5 and 24.9. A BMI below 18.5 is considered underweight, 25 to 29.9 is overweight, and 30 or above is classified as obese.
BMI is a useful screening tool but has limitations. It does not distinguish between muscle mass and fat mass, meaning athletes or very muscular individuals may have a high BMI without having excess body fat. It is also less accurate for the elderly, pregnant women, and growing children.