The scale the scientists used tracks a range of penis lengths and girths, with measurements of length when erect ranging from 1.9 inches (4.8cm) to 8.3 inches (21.2cm).
Psychiatrists who carried out the study said they hope the findings could help men suffering from “small penis anxiety” because of concern that they do not match up to the norm.
Researchers from the Institute of Psychiatry said the analysis – and graphs showing the full range of sizes recorded – could provide insights on what is considered "normal" for penis length and circumference in men.
They said the findings, published in the journal BJU International, may be helpful when counselling men who are worried about their size, some of whom are so distressed that they can even be diagnosed with Body Dysmorphic Disorder.
Until now, there have been no formal systematic reviews of penile size measurements and no attempts to create a graphical diagram that depicts the distribution of the size of a flaccid or erect penis.
Dr David Veale, of King's College London and South London and Maudsley NHS Foundation Trust, and colleague from King's College Hospital NHS Foundation Trust, set out to create such a nomogram of male penis size measurements, covering a wide range of ages and races.
A search of medical literature revealed 17 studies with up to 15,521 males who underwent penis size measurements by health professionals using a standard procedure.
Dr Veale said: "We believe these graphs will help doctors reassure the large majority of men that the size of their penis is in the normal range.
"We will also use the graphs to examine the discrepancy between what a man believes to be their position on the graph and their actual position or what they think they should be."
The new analysis suggests age makes little difference, although some of the studies found the flaccid lengths and circumferences of the penises of older men were greater than those of younger men.
Dr Martin Baggaley, medical director at South London and the Maudsley, said: “Body Dysmorphic Disorder causes a person to have a distorted view of how they look and they can spend an obsessive amount of time worrying about their appearance. This can include worries over their weight, specific parts of their body and, for men, the size of their penis. This can take over someone’s life and cause a great deal of distress.