Fenton Growth Chart Z-Score (Preterm)

Calculate z-scores for weight, length, and head circumference in preterm infants from 22 to 50 weeks postmenstrual age using the Fenton 2013 growth reference.

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 z-scores for weight, length, and head circumference in preterm infants from 22 to 50 weeks postmenstrual age using the Fenton 2013 growth reference

Each component has a specific meaning:

  • 22 — The 22 recorded for the scenario being assessed.

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

How to Use

Enter the 22 for the scenario you are assessing. Calculate z-scores for weight, length, and head circumference in preterm infants from 22 to 50 weeks postmenstrual age using the Fenton 2013 growth reference. Use the fenton z-score result to inform your calculation.

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Frequently Asked Questions