Calculadora de IMC Gratuito en Línea

For adults aged 18 and over, the World Health Organisation classifies BMI as follows: Under 18.5 = Underweight, 18.5–24.9 = Normal weight, 25–29.9 = Overweight, 30 and above = Obese. These thresholds are general guidelines and may not apply equally to all body types and ethnicities.

BMI does not distinguish between muscle and fat mass. Athletes and people with high muscle mass often score in the Overweight or Obese range despite having low body fat. For a more accurate picture, complement BMI with waist circumference, body fat percentage, or a consultation with a healthcare professional.

No. For people under 18, BMI is interpreted using age- and sex-specific growth charts (BMI-for-age percentiles) rather than the fixed adult thresholds. This calculator is designed for adults. For children, consult a paediatrician or use a dedicated paediatric BMI tool.

No. All calculations run locally in your browser. No data you enter is transmitted to any server or stored anywhere. Your inputs disappear when you close or refresh the page.

The calculator shows your healthy weight range directly in the results — the weight range that falls within a BMI of 18.5 to 24.9 for your height. If your current weight is outside that range, the difference tells you how much to gain or lose to reach a normal BMI.

Yes, the Calculadora de IMC on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.

Calcula tu Índice de Masa Corporal y conoce tu categoría de peso. No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.

No installation needed. The Calculadora de IMC runs entirely in your web browser on any device — desktop, tablet, or mobile.

Completely safe. The Calculadora de IMC processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.

After the page loads for the first time, the Calculadora de IMC works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or network lookups) require an active connection.

The Calculadora de IMC uses clinically validated formulas such as the Mifflin–St Jeor or Harris–Benedict equations where applicable. Results are population-based estimates and can differ from measured values by 10–20% for individuals with atypical body composition. See our <a href="/methodology/">Methodology page</a> for full formula sources and references. Consult a qualified healthcare professional before making medical or dietary decisions.

The Calculadora de IMC uses an established, peer-reviewed formula endorsed by leading health organisations such as the WHO, CDC, or NIH where applicable. The specific formula is chosen for its validated accuracy across diverse adult populations under normal conditions.

Yes. The Calculadora de IMC is built with standard browser APIs and works on all modern browsers including Chrome, Firefox, Safari, and Edge — on both desktop and mobile. No plugins, extensions, or third-party software are required.

Select and copy the result text to paste into any document or app. For image tools, a Download button saves the file directly to your device. Your browser's built-in screenshot function also captures results quickly. No account or login is required.