Having written more than 10 Harry Potter novels and companion books—not to mention her works outside of the Wizarding World under the alias Robert Galbraith—one would assume that ​JK Rowling is worth a pretty penny. But even then, you probably underestimated just how much the acclaimed author is worth.

Using a Revealing Charm (and ​Celebrity Net Worth), we've discovered Rowling's true net worth, and after the books, the films, the Cursed Child play, and the never-ending merchandise, it comes in at $1 billion.

Just to put that in perspective: Stephen King is estimated to have a net worth of $400 million; Danielle Steel comes in at $385 million; and John Grisham is worth an estimated $350 million. Basically, Rowling is the richest author at the moment—and she wins by a landslide. She is also the first author in the world to hit the $1 billion mark.

And as any Potterhead would agree, it's well-deserved. Although Rowling had a tough life growing up, she used the negative aspects as inspiration for characters. After graduating from college, Rowling saw herself as a failure, later admitting she was depressed and ​contemplated suicide. She worked through a failed marriage, was a single mother, and was jobless ... until she wrote Harry Potter.

When Rowling finally became financially successful, she almost immediately gave back. In fact, she actually made her first $1 billion in 2004, but ​lost her billionaire status after donating a large sum to charity.