And the author who published her last book about the boy wizard in 2007, could see that figure increase to £17 billion in the coming years.

The eight novel franchise which concluded with Harry Potter And The Deathly Hallows, includes eight movies, as well as computer games and Potter theme parks at Universal Studios in Hollywood and Orlando.

According to the report the writer, who has sold £141 million ($202m) worth of printed novels in the U.K. and the U.S. alone, rakes in £1 for every Harry Potter book sold, reports British newspaper The Sun.

In addition her website Pottermore raised £70 million ($100m) in the last three years alone and that sum could stand to rise even further as she is set to release more projects.

Despite coming under fire for her depiction of Native Americans, the author launched a new taster story series called Magic in North America last week as part of the promotion for the forthcoming film adaptation of Potter prequel, Fantastic Beasts and Where to Find Them.

Set for release in November, it stars box office draw and Oscar winner Eddie Redmayne. (16).

Meanwhile the new stage play Harry Potter And The Cursed Child is also capturing fans imaginations, as it promises to tell a brand new story in two parts. The play, which premiers at London's Palace Theatre this July, has already proved popular, securing £127million of advance ticket sales, according to The Sun.

“With all these new releases on the horizon, the franchise has the potential to become even bigger than during the books’ heyday.

“The beauty of the Potter series is that the success of every new part brings back attention — and therefore sales — to older parts of the franchise.

“Every successful film will also sell more books, every performance of the play will encourage more people to go to the theme parks, and so on," he explained to The Sun.

J.K. Rowling's personal fortune is estimated to be over £530 million ($720million).