How much does it cost to copyright a book?

Answer 1

In most countries (over 160), copyright is free. In a few countries where you can register copyright, a small fee is charged.

In the USA, where copyright registration is optional until you want to sue in federal court, copyright registration costs $35 for each application. One application can be used to protect hundreds of works simultaneously in a collection.

Answer 2

It all depends on the publisher you go to. I know somone who does it for free.