BMI Calculator

Calculate your Body Mass Index and weight category from height and weight.

0Your BMI
—Category
—Healthy weight

BMI is a general screening tool, not a diagnosis. It doesn't account for muscle mass, age or body composition. Talk to a healthcare professional for personalised advice.

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How to use BMI Calculator

Three quick steps — no sign-up needed

  1. Step 1

    Choose units

    Select Metric (cm, kg) or Imperial (ft/in, lb) so the fields match how you measure.

  2. Step 2

    Enter height and weight

    Fill height and weight accurately. Small measurement errors change BMI more than people expect.

  3. Step 3

    Read BMI and category

    See your Body Mass Index number and the usual underweight / normal / overweight / obesity category bands.

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About BMI Calculator

BMI Calculator works out Body Mass Index from your height and weight - a quick screening number used in many fitness and public-health charts. Search phrases like "calculate my BMI", "BMI calculator kg cm", and "BMI chart imperial" all point to this kind of tool.

Pick Metric or Imperial, enter height and weight, and get a BMI value plus a category label. Metric uses centimetres and kilograms; Imperial uses feet, inches, and pounds. The formula is the same standard ratio of weight to height squared, only the unit conversion changes.

BMI does not measure body fat, muscle, or health on its own. Athletes with high muscle mass can show a high BMI while still being lean; older adults or people with different body frames may need other assessments. Use the number as one data point next to waist size, fitness, labs, and clinical advice.

These results are educational estimates only and are not a medical diagnosis. Talk to a qualified clinician for personal health decisions. If BMI is only one part of a wider concern (rapid weight change, eating issues, pregnancy), get personal medical guidance rather than relying on an online calculator alone.

Benefits of BMI Calculator

Metric and Imperial Switch units instead of converting height and weight by hand.
Category context See where the number sits on common BMI ranges, not only a bare score.
Fast screening figure Useful when a form, coach, or article asks for BMI specifically.
Private in the browser Enter your numbers and get a result without installing an app.

Frequently asked questions

How do I calculate BMI?

Choose Metric or Imperial, enter height and weight, and the tool computes Body Mass Index and a category band.

What is a normal BMI range?

Many charts treat about 18.5-24.9 as normal for adults, but cut-offs can differ by guideline and are not perfect for every body.

Is BMI accurate for athletes?

Often less useful when muscle mass is high. Body composition tests or clinical review are better in that case.

Does this BMI calculator work in feet and pounds?

Yes - select Imperial and use feet, inches, and pounds.

Is this medical advice?

No. BMI here is an educational estimate. Discuss results with a healthcare professional when decisions matter.