This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.

Measured value → z-score

Calculate the z-score from measurement, age and reference curve

Reference

Data set

Measured parameter

Child

Sex

male female

Gestational age at birth (optional, preterm infants)

Age

Birth and measurement date Age directly

Date of birth

Measurement date

empty = today

Years

Months

Weeks

Days

Correct age in preterm infants up to 24 months

Measured value

Value (in the unit of the measurement: kg, cm, mm, kg/m²)

Reset

About this calculator

Z-score and percentile of a measured value – the conversion in the opposite direction to the universal calculator.

For datasets with an age axis, if a gestational age is given, corrected age applies (up to 24 months); for preterm growth charts, postmenstrual age. All datasets and their sources: Reference datasets.

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Reference and license

WHO 2006 Expanded – 0–5 years.
WHO Multicentre Growth Reference Study Group. WHO Child Growth Standards: Methods and development. Geneva: WHO; 2006 (length/height, weight, BMI) and 2007 (head circumference, arm circumference, skinfolds). License: WHO; tables taken from the R package childsds (GPL). Source
Length supine up to 24 months, then standing height – the WHO curve already incorporates the jump of 0.7 cm.

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Note

Calculation aid for healthcare professionals. Percentiles and z-scores describe the position of a measured value in the reference population; clinical assessment remains with the treating physician.