BMI Calculator Metric and Imperial

Your BMI History – Advanced BMI Calculator

Enter your weight and height, and select your preferred units (metric or imperial) to calculate your BMI.

BMI History

    What is BMI?

    Body Mass Index (BMI) is a simple calculation used to estimate whether a person has a healthy body weight for their height. It’s commonly used by health professionals to screen for weight categories that may lead to health problems.

    BMI Formula:

    Although BMI doesn’t directly measure body fat, it provides a quick snapshot of whether your weight is in a healthy range.

    How to Interpret BMI Results

    Once calculated, your BMI will fall into one of the following categories:

    CategoryBMI Range
    UnderweightLess than 18.5
    Normal Weight18.5 – 24.9
    Overweight25.0 – 29.9
    Obesity30.0 and above

    These categories are general guidelines. Age, gender, muscle mass, and ethnicity can all influence how BMI should be interpreted. For the most accurate health assessment, always consult with a healthcare provider.

    Metric vs. Imperial Units

    BMI can be calculated using two unit systems:

    Our calculator allows you to choose either system depending on your preference or location, and it will handle the conversion automatically for you.

    💬 Frequently Asked Questions (FAQ)

    Is BMI accurate?

    BMI is a widely used screening tool that gives a general indication of body fat based on weight and height. However, it does not account for muscle mass, bone density, or overall body composition. Athletes, for example, may have a high BMI but low body fat. For a more complete health assessment, consult a healthcare professional.

    What is a healthy BMI range?

    A healthy BMI typically falls between 18.5 and 24.9. Below 18.5 is considered underweight, 25–29.9 is overweight, and 30 or higher is classified as obesity.

    Can I use BMI for children?

    BMI for children and teens is interpreted differently. It is age- and sex-specific and compared using percentiles. Pediatricians often use BMI-for-age charts for accurate evaluation.

    Why does the calculator ask for metric or imperial units?

    Different regions use different measurement systems. The calculator supports metric (kg/m) and imperial (lb/in) so users around the world can accurately check their BMI.

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