Free BMI Calculator Tool – Calculate Your Body Mass Index and Check If You’re Healthy
The BMI Calculator Tool helps you instantly calculate your Body Mass Index (BMI) to understand whether your weight is in a healthy range for your height. Simply enter your height and weight, and this online BMI calculator will show whether you are underweight, normal, overweight, or obese — based on WHO standards. It’s ideal for anyone tracking fitness, nutrition, or health goals. This tool supports both metric (kg/cm) and imperial (lbs/inches) systems for global users and provides a clear interpretation of your BMI score to help you make informed health decisions.
Calculate Your BMI Instantly
BMI Calculator FAQs
Find answers about how BMI is calculated, what your score means, and how to use this tool effectively.
BMI (Body Mass Index) is a measurement that uses your height and weight to estimate body fat and assess whether you’re underweight, healthy, overweight, or obese.
BMI = weight (kg) / [height (m)]². Our BMI Calculator does this instantly using either metric or imperial units.
According to WHO standards:
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Underweight: Below 18.5
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Normal: 18.5 – 24.9
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Overweight: 25 – 29.9
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Obese: 30 and above
While BMI is a reliable general indicator, it may not perfectly represent athletes or individuals with high muscle mass. Always consult a healthcare provider for a full assessment.
This calculator is designed for adults. For children or teens, age and gender-based BMI percentiles are recommended.
Yes — it’s 100% free, online, and easy to use on any device without sign-up.