BMI Calculator

Check your Body Mass Index (BMI) and see if you're underweight, healthy, overweight, or obese.

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BMI Calculator

Weight

Unit of measurement *
cm
kg
ft
in
lbs

BMI

Underweight
Healthy
Overweight
Obese

Explore BMI Calculator

About BMI Calculator

The BMI Calculator is a quick and reliable tool for assessing body weight relative to height, providing users with a Body Mass Index (BMI) value and health classification. By entering your height and weight — either in metric or imperial units — this tool instantly calculates your BMI and categorises it as underweight, healthy, overweight, or obese.

Practical Use Cases:

  • Individuals tracking fitness or weight loss can use this tool to set goals and monitor progress.
  • Doctors and health professionals often refer to BMI as a screening method to assess potential health risks related to body fat.
  • Parents may use it to track their child’s growth and understand whether they're within a healthy range.
  • Nutritionists and wellness coaches use BMI as part of a broader assessment to design personalised diet or fitness plans.
  • Insurance agents or health policy applications often require BMI data to determine eligibility or premiums.
  • Employers may include BMI screenings as part of corporate wellness programs.

While BMI doesn’t account for muscle mass, bone structure, or gender-based variation, it offers a useful baseline for understanding health risks related to weight. It’s especially beneficial for people looking to understand their weight category, take preventive health steps, or establish baseline metrics for lifestyle changes.

How BMI Calculator Works

Select Unit System:

Choose between Metric (cm/kg) or Imperial (ft/in/lbs).

Input Fields:

  • For Metric: Enter height in centimeters and weight in kilograms.
  • For Imperial: Enter height in feet and inches, and weight in pounds.

Conversion (Hidden):

The tool automatically converts imperial units to metric behind the scenes.

Calculation Outputs:

  • BMI – Based on standard formula: weight (kg) ÷ [height (m)]².
  • BMI Prime – A comparative value against the upper healthy threshold.
  • Classification – Based on WHO standards: Underweight, Healthy, Overweight, Obese.

Visual Prompt:

The result includes a readable classification and a suggested healthy range.

FAQs for BMI Calculator

What is BMI?

BMI (Body Mass Index) is a numerical value that estimates body fat based on height and weight.

Is BMI accurate for everyone?

It’s a general guide — athletes or muscular individuals may appear overweight due to muscle mass.

Can I use feet/inches and pounds?

Yes, the calculator supports both metric and imperial units.

What’s considered a healthy BMI?

Typically between 18.5 and 24.9, but your doctor may provide a more personalised range.

Does this tool track progress over time?

No, it’s a one-time calculation tool. For tracking, you can use health apps or journals.

Should children use this BMI calculator?

This version is for adults. Children's BMI is age- and sex-specific and requires a different tool.

Report an Issue with BMI Calculator

If you encounter any issues or have suggestions for improvements, please report them using the form below.

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