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BMI Calculator - Online Body Mass Index Tool

Calculator Health BMI body mass calculator health
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BMI Calculator

Free online Body Mass Index tool – instantly calculate your BMI and learn what it means.

Please enter a valid height (50–250 cm).
Please enter a valid weight (10–500 kg).
Feet must be 1–8.
Inches 0–11.
Weight 20–1000 lbs.
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1518.5253040

What is BMI?

Body Mass Index (BMI) is a numerical value of your weight in relation to your height. It is a simple screening tool used to categorize individuals as underweight, normal weight, overweight, or obese. BMI is widely used by health professionals worldwide.

BMI Categories (WHO)

  • Underweight BMI less than 18.5
  • Normal weight BMI 18.5 – 24.9
  • Overweight BMI 25 – 29.9
  • Obese BMI 30 and above

Frequently Asked Questions

BMI = weight (kg) / [height (m)]2 for metric units. For imperial: BMI = (weight (lbs) / [height (in)]2) × 703. Our calculator does the math instantly.

BMI is a useful population-level screening tool, but it has limitations. It does not directly measure body fat, muscle mass, or fat distribution. Athletes with high muscle mass may have a high BMI but low body fat. Always consult a healthcare provider for a complete health assessment.

A BMI between 18.5 and 24.9 is generally considered healthy for adults. Our tool shows your personal healthy weight range based on your height.

BMI for children and teens is age- and sex-specific (often called BMI-for-age). This calculator is designed for adults aged 20 and older. For older adults, muscle loss can affect BMI interpretation; a healthcare provider can give better guidance.

Focus on sustainable lifestyle changes: balanced nutrition, regular physical activity, adequate sleep, and stress management. Gradual weight changes are healthier. Seek advice from a dietitian or doctor for a personalized plan.
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