BMI-Rechner

What is BMI?

Body Mass Index (BMI) is the most popular method for assessing body mass relative to height. Developed by Belgian statistician Adolphe Quetelet in the 19th century, it became a standard tool in medicine and health promotion. BMI is calculated by dividing body weight in kilograms by height in meters squared. It doesn't directly measure body fat but correlates well with health risks.

BMI categories

• Underweight - BMI below 18.5, may indicate malnutrition or health issues
• Normal weight - BMI 18.5-24.9, optimal range for health
• Overweight - BMI 25-29.9, increased risk of some diseases
• Obesity - BMI 30 or higher, significantly elevated health risk

BMI limitations

BMI doesn't distinguish between muscle mass and body fat, so athletes may have high BMI despite low body fat. Fat distribution also matters - visceral fat (around organs) is more dangerous than subcutaneous fat. BMI doesn't account for sex, age, or body build either. Additional measurements are used for more accurate assessment.

Health consequences

Both underweight and obesity increase the risk of disease and premature death. Obesity increases risk of type 2 diabetes, heart disease, hypertension, certain cancers, and joint problems. Underweight can lead to osteoporosis, weakened immune system, and fertility issues. Maintaining BMI in the normal range is one of the simplest ways to care for health.