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BMI Calculator

Quick body mass index screen with metric and imperial units.

Estimate BMI from height and weight in either metric or imperial units, with WHO classification.

Priya Venkatesan By Priya Venkatesan
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

BMI = weight (kg) / height (m)2

In depth

Estimate BMI from height and weight in either metric or imperial units, with WHO classification.

Frequently asked questions

BMI is a screening tool, not a diagnostic one. It does not distinguish muscle from fat and works less well for athletes, older adults, and pregnant people.

No single BMI reading replaces a conversation with a clinician. Use it as one signal among many — waist circumference, blood work, and lifestyle factors all matter.

Sources & references

  1. Body mass index — overview of clinical use
    Internal editorial reference
    article