BMI Calculator
Calculate your Body Mass Index and understand your health status.
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Calculate your Body Mass Index and understand your health status.
Get a first reference on whether your weight-to-height ratio falls within healthy parameters according to international standards.
Calculate your BMI periodically to monitor body composition changes during diet or exercise programs.
A concrete number is more motivating than subjective feelings. BMI gives a measurable reference for realistic weight goals.
Unlike bioimpedance or DEXA scans, BMI only requires your weight and height.
The WHO uses BMI as a standard epidemiological indicator, facilitating communication with healthcare professionals.
Body Mass Index is one of the most widely used indicators for quickly assessing whether a person has an appropriate weight relative to their height. Calculated as kg/m2, it remains the WHO reference tool for classifying overweight and obesity at the population level.
BMI is a statistical indicator, not a clinical diagnosis. It does not distinguish between muscle and fat mass. Therefore, it should be interpreted as a first filter that, combined with other indicators like waist circumference, provides a more complete health picture.
Despite its limitations, calculating BMI regularly is valuable for prevention. A BMI above 25 is statistically associated with increased cardiovascular disease, type 2 diabetes, and hypertension risk. Early detection of upward trends allows preventive measures.
BMI does not consider body composition. An athlete with high muscle mass may have high BMI without excess fat. Use it as guidance, not a verdict.
Standard BMI ranges (18.5-24.9) are for adults. Children and adolescents use age-specific percentiles.
Weight fluctuations of 1-2 kg from hydration or digestion can shift BMI between categories. Weigh yourself consistently.
Abdominal fat (visceral fat) is more dangerous than hip/leg fat. Complement BMI with waist circumference measurement.
BMI (Body Mass Index) relates weight to height. It is calculated by dividing weight in kilograms by height in meters squared: BMI = weight (kg) / height (m)2. The WHO classifies results as: underweight (below 18.5), normal (18.5-24.9), overweight (25-29.9), and obese (30+).
For adults, the normal range is 18.5-24.9, regardless of age. For people over 65, a slightly higher BMI (23-27) may be protective. Children use age-specific percentiles.
BMI has limitations for people with high muscle mass. Athletes may have high BMI without excess fat since muscle weighs more than fat by volume. Body fat percentage is more useful in these cases.
Once a month is sufficient for monitoring. Significant body composition changes do not happen overnight. Every 2-4 weeks gives clear progress pictures.
A BMI above 25 is a signal to review your habits. Consult a healthcare professional who can evaluate your individual case considering body fat percentage, medical history, and lifestyle.
WHO ranges are the same for both sexes. However, women naturally have higher body fat percentage at the same BMI. Some experts suggest slight adjustments by sex.
BMI is a screening tool, not diagnostic. Diagnosing obesity requires clinical evaluation including body composition, fat distribution, blood tests, and complete medical assessment.
Important health notice
Esta herramienta proporciona resultados orientativos y no sustituye el consejo medico profesional. Los resultados pueden variar segun factores individuales. Consulta siempre con un medico o nutricionista antes de tomar decisiones sobre tu salud basandote en estos calculos.