WHO Weight-for-Age Z-score

Calculate weight-for-age z-score for children under 5 using WHO 2006 growth standards. Z-score <-2 = underweight, <-3 = severely underweight.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Calculate weight-for-age z-score for children under 5 using WHO 2006 growth standards. Z-score <-2 = underweight, <-3 = severely underweight

Each component has a specific meaning:

  • WHO 2006 growth standards — The who 2006 growth standards recorded for the scenario being assessed.

Note: Interpret the who weight z-score result against the thresholds and context described above.

How to Use

Enter the WHO 2006 growth standards for the scenario you are assessing. Calculate weight-for-age z-score for children under 5 using WHO 2006 growth standards. Z-score <-2 = underweight, <-3 = severely underweight. Use the who weight z-score result to inform your calculation.

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Frequently Asked Questions