Scientists have measured more than 15,000 men’s penises in an effort to find out what size is “normal”. Researchers at King’s College London and a London NHS trust said they hoped the review would help address “the concern that some men have about their penis size” and aid people suffering from anxiety and distress. They revealed that the average flaccid penis is 3.6ins (9.16cm) long, or 5.2ins (13.24cm) when stretched, and 3.7ins (9.31cm) in circumference. Erect penises are 5.1ins (13.12cm) long on average and 4.5ins (11.66cm) in girth.