This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.
Z-score & percentile
4 calculators · z-score ↔ percentile ↔ measurement, gestational age weeks ↔ days
Here you will find conversion calculators for z-score and percentiles: z-score ↔ percentile based on the standard normal distribution, measured value → z-score and z-score → measured value for a reference curve, as well as the conversion of gestational age between weeks+days, total days and decimal weeks. They are intended for quick conversion in everyday clinical practice. The calculators provide the z-score and percentiles of a measured value, the measured value for a z-score or a percentile, and a conversion table; they complement the universal calculator. Each calculator states its formula and sources.
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Gestational age weeks ↔ days
32+4 → 228 days and back; weeks as decimals -
Z-score → measured value
Calculate the measurement from z-score, age and reference curve -
Measured value → z-score
Calculate the z-score from measurement, age and reference curve -
Z-score ↔ percentile
Convert z-score to percentile and back (standard normal distribution)
Frequently asked questions
How do I convert a z-score to a percentile?
The z-score ↔ percentile calculator converts a z-score (SDS) into the percentile and vice versa, based on the standard normal distribution, and provides a lookup conversion table for both directions.
How do I convert a gestational age from weeks+days to days?
The gestational age weeks ↔ days calculator converts between weeks+days (e.g. 32+4), total days (228 days) and decimal weeks, and back. This allows data given in weeks+days and in total days to be converted into one another.
Which measured value corresponds to a given z-score?
The z-score → measured value calculator determines the corresponding measured value from z-score (or percentile), age, sex and reference curve. The reverse direction is provided by the measured value → z-score calculator.