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BMI Calculator Online

Calculate your Body Mass Index with metric or imperial units

Como usar Calculadora de IMC

  1. 1

    Select units

    Choose metric (kg/cm) or imperial (lb/ft/in).

  2. 2

    Enter height and weight

    Fill in your height and weight values.

  3. 3

    View results

    Your BMI, weight category, and healthy weight range are shown instantly.

Perguntas frequentes

Is my data safe?
Yes. All processing happens entirely in your browser. Your data never leaves your device and is never uploaded to any server.
What is BMI and how is it calculated?
BMI (Body Mass Index) is a measure of body weight relative to height. The formula is: BMI = weight (kg) / height (m)². In imperial units: BMI = (weight (lb) / height (in)²) × 703. The result is a dimensionless number that is categorized into ranges.
What are the BMI categories?
According to the WHO: Underweight = below 18.5, Normal weight = 18.5–24.9, Overweight = 25–29.9, Obese = 30 and above. These are guidelines for adults 18 and older.
Is BMI accurate for everyone?
BMI is a population-level screening tool with known limitations. It can overestimate body fat in muscular individuals (like athletes) and underestimate it in older adults who have lost muscle mass. It also does not account for fat distribution, which affects health risk.
What is a healthy weight for my height?
The tool calculates your healthy weight range based on the Normal weight BMI range (18.5–24.9) for your specific height. This gives you a concrete weight goal rather than just a category label.

Saiba mais

O que é BMI Calculator?

Calculate your Body Mass Index (BMI) instantly using metric (kg/cm) or imperial (lb/in) units. Enter your height and weight to get your BMI value, weight category (Underweight, Normal, Overweight, Obese), and a healthy weight range for your height. All calculations happen in your browser — your health data is never sent to any server.

Por que usar BMI Calculator?

  • Supports both metric (kg/cm) and imperial (lb/ft/in) units — no manual conversion needed.
  • Shows your BMI category (Underweight, Normal weight, Overweight, Obese) alongside the number.
  • Calculates the healthy weight range for your height so you know your target range.
  • 100% private — your height and weight data never leaves your browser.
  • Instant results with no sign-up or installation required.

Casos de uso de BMI Calculator

Health and fitness tracking

Monitor your BMI over time as you work toward a fitness goal to understand where you stand relative to healthy ranges.

Medical and insurance forms

Quickly calculate your BMI when completing health assessments, insurance applications, or medical intake forms.

Educational purposes

Learn about BMI ranges and their classifications for health education, nursing, or personal wellness courses.

Goal setting

Use the healthy weight range output to set a target weight goal based on your height.

Dicas e boas práticas

  • 💡BMI is a screening tool, not a diagnostic measure. A high BMI may indicate excess body fat, but it doesn't account for muscle mass, bone density, or fat distribution.
  • 💡Athletes and very muscular individuals often have a high BMI despite low body fat because muscle is denser than fat.
  • 💡BMI ranges were originally calibrated for adults. Different interpretations may apply for children, the elderly, or specific ethnic populations.
  • 💡A BMI between 18.5 and 24.9 is considered the 'Normal weight' range for most adults according to the WHO.

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