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BMI from Height and Weight (Metric & Imperial) Calculator

Body Mass Index with WHO category.

Calculates BMI = weight(kg) / height(m)², with WHO classification: underweight < 18.5, normal 18.5–24.9, overweight 25–29.9, obese ≥ 30.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

kg
m

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 = kg / m²

In depth

Calculates BMI = weight(kg) / height(m)², with WHO classification: underweight < 18.5, normal 18.5–24.9, overweight 25–29.9, obese ≥ 30.