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Health calculator

BMI Calculator

Calculate adult body mass index from weight and height using the metric formula.

✓ Tested formula✓ Instant result✓ Private by design
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Enter your valuesResults update instantly as you type.

✓ Your numbers stay on this device.

Understand the answer

Formula and method

FormulaBMI = weight in kilograms ÷ height in metres squared.

BMI is a screening ratio, not a diagnosis. It does not directly measure body fat or account for every difference in body composition.

Worked example

70 kg at 175 cm gives a BMI of about 22.86.

How to use this calculator

  1. Enter the values using the labels and units shown.
  2. Review the live result and supporting details.
  3. Check the formula, example and assumptions before using the answer.

Assumptions and limits

  • For adults only.
  • Do not use this result as medical advice.

Reference

Formula reviewed 2026-07-15

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