About

Almost everything written online about penis size is either selling something or arguing about a number without saying how it was measured. This site puts the published figures on one ruler and shows, for every one of them, where it came from and how it was taken.

It is maintained independently and has no commercial relationships. There are no ads, no affiliate links, no tracking and no cookies. Nothing you do here is recorded beyond ordinary, short-lived server logs.

Corrections and new studies

Every number on this site comes from a published source, and every change is recorded in the changelog. The complete data can be browsed on the data page. The data files will be available for download later.

If you find an error, or know of a study that belongs here, email [email protected] with a link to the primary source — the paper itself, not a summary or a news story. Corrections without a source can't be accepted. Your address is used only to reply to you.

Data credit

Many pooled figures and the every-study view draw on calcSD, a community-maintained compilation of published measurement studies, and on its public dataset API. Primary studies are cited on every row.

If this is worrying you

Most men who worry about their size are well within the normal range — in one clinic study, every man who asked for lengthening surgery measured normal, and most changed their minds once they saw where they actually fell. If concern about your body is affecting your life or relationships, a GP, a urologist, or a therapist familiar with body-image concerns can help. It's a common worry and a very treatable one.