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BMI Calculator

Body Mass Index from your height and weight.

BMI is a general screening measure, not a diagnosis. It doesn't account for muscle mass, bone density, or body composition. Talk to a healthcare provider for a full picture.

Standard BMI Ranges (WHO/CDC)

CategoryBMI
UnderweightBelow 18.5
Normal weight18.5 – 24.9
Overweight25.0 – 29.9
Obese30.0 and above

Based on WHO's global adult BMI classification, also used by the U.S. CDC.

  • WHO recommends a lower Asian-population overweight cutoff of ~23 in some national guidelines (e.g. parts of South & East Asia).
  • BMI is a population screening tool, not a diagnosis — it doesn't separate fat from muscle.
  • For children/teens, clinicians use age- and sex-specific percentile charts, not adult BMI cutoffs.
  • Waist circumference or waist-to-height ratio is often used alongside BMI for a fuller picture.

Body Mass Index is a widely used general health screening number based on height and weight. This calculates it in metric or imperial units and shows which BMI category the result falls into.

বিএমআই হিসাব করতে চান? উচ্চতা ও ওজন দিয়ে সহজেই আপনার বিএমআই জেনে নিন — সম্পূর্ণ বিনামূল্যে, সরাসরি আপনার ব্রাউজারে।

How it works

  1. Choose your unit systemMetric (cm/kg), Imperial (ft-in/lb), or ft/in + kg.
  2. Enter height and weightThe result updates live as you type.
  3. Read your BMI and categoryUnderweight, normal, overweight, or obese, per the standard WHO ranges.

FAQ

What is a healthy BMI range?

Generally 18.5–24.9 is considered normal weight by WHO standards, though this varies by individual factors like muscle mass and ethnicity.

Is BMI accurate for athletes?

Not always — BMI doesn’t distinguish muscle from fat, so very muscular people can show a higher BMI despite low body fat.

Does this work on Mac, Windows, or my phone?

Yes — it runs in any modern browser on Mac, Windows, Chromebook, iPhone, or Android. No app or software to install.

I know my height in ft/in but weight in kg — can I mix units?

Yes. Whichever unit system you pick, a small converter appears under the height and weight fields showing the equivalent in the other system, so you can enter what you know either way.