It's a common concern for men the world over and now it seems researches have scientific data on what the average penis size is.

According to an analysis of more than 15,000 penises around the world - 13.12cm (5.16 inches) in length when erect, and 11.66cm (4.6 inches) around is the norm.

Scientists also found that in its flaccid state, the penis of the average man is 9.16cm (3.6 inches) in length and has a girth of 9.31cm (3.7 inches).

The British research also found there was a small correlation between the erect length of a penis and a man's height.

The team also created a graph, using the collated data, that doctors can use in counselling men with “small penis anxiety” or help diagnose Body Dysmorphic Disorder in patients.