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Calculate body mass index from metric or imperial height and weight values in one simple browser-based tool.
Calculate BMI
Enter your height and weight in metric or imperial units to calculate body mass index instantly.
Estimate BMI with either metric or imperial measurements
Switch between centimeters and kilograms or feet, inches, and pounds. The result card shows the BMI score, weight-status category, and a healthy reference range for the entered height.
BMI result
Review the BMI score, category, and healthy reference range for the entered height.
Live result
Enter your height and weight to calculate BMI.
Enter your height and weight to calculate BMI.
BMI visual scale
Healthy weight range (BMI 18.5-24.9)
Available after calculation
Enter a valid height and weight to see the range.
Based on the standard healthy BMI range.
How to use this BMI calculator
- Choose whether you want to enter measurements in metric or imperial units.
- Enter your height and weight values.
- Review the BMI score and category in the result panel.
- Check the healthy weight reference range for your entered height.
BMI calculator examples
- 175 cm and 72 kg -> BMI 23.5 in the healthy weight range
- 5 ft 9 in and 180 lb -> BMI 26.6 in the overweight range
- 170 cm and 50 kg -> BMI 17.3 in the underweight range
What BMI measures
Body mass index estimates the relationship between body weight and height. It is commonly used as a quick screening metric to group results into standard categories such as underweight, healthy weight, overweight, and obesity.
Metric and imperial BMI inputs
This calculator supports both centimeters and kilograms as well as feet, inches, and pounds. That makes it useful whether you are reading fitness data, health forms, or clinical references that use different measurement systems.
How to read the healthy weight range
The healthy weight range shown here is a general reference based on the standard BMI range of 18.5 to 24.9 for your entered height. It is helpful for context, but it is not a diagnosis, treatment plan, or personalized medical recommendation.
BMI calculator FAQs
Does this BMI calculator support imperial units?
Yes. You can switch to imperial mode and enter height in feet and inches and weight in pounds.
Is BMI a medical diagnosis?
No. BMI is a general screening metric that helps estimate weight status from height and weight, but it does not replace diagnosis, treatment, or advice from a qualified medical professional.
What healthy range does this calculator use?
The healthy weight reference range is derived from the standard BMI range of 18.5 to 24.9 for the entered height.