Glossary

Definitions for key terms used in calculators and educational pages.

Key facts

A central reference value used for comparison.

A rank showing where a value falls in a reference distribution.

Distance from the average in standard deviation units.

A spread measure used to estimate percentile from a distribution.

Length measured when erect, usually base to tip.

Circumference measured around the erect shaft.

Length measured when flaccid under consistent conditions.

Length method pressing to pubic bone for consistency.

Length method measured from skin-level base to tip.

Secondary erect length reference tied to country-level compiled data.

Primary educational reference based on pooled research.

Published or compiled data used to build comparisons.

A non-diagnostic statistical output for learning context.