As writers, we all hope to earn enough from our craft to live. Nothing promotes the completion of a next book as much as income from the last book (and the time needed to write it). Leaving that day job to write full time can be a big, scary step. For those of us not in the graces of a wealthy sugar-momma, the Book Royalties Calculator by Shawntelle Madison is a valuable tool in helping determine how much your royalties might be.A round of applause to Shawntelle for creating this.