That depends on:
- Your book’s retail price
- The platform and its royalty rate
- The print cost (for physical books)
For example:
A $12.99 paperback on KDP might earn you around $4–$5 per sale after printing and fees.
An ebook priced at $4.99 with 70% royalty may yield $3.40.
Use each platform’s royalty calculator to get exact numbers.