There is no charge to upload your book to the Amazon Kindle Direct Publishing platform.
Amazon has two Royalty Option plans:
> 35% of the Kindle book sales price
> 70% of the Kindle book sales price
If you choose the 70% Royalty Option, a Delivery Charge (currently, 15 cents per MB in the USA) is deducted from your royalty.
If you choose the 35% Royalty Option, there is no Delivery Charge.
You decide which is best for you, depending on the size of your book (in megabytes), and various other factors you'll read about in the links below.
There is more to it, of course... things you must consider before deciding on a price for your book... and Amazon's terms and conditions.
Get details and more help at the links below:
Kindle Direct Publishing Terms and Conditions Pricing Page
Frequently Asked Questions Sales and Royalties FAQ
~ <> ~ <> ~ <> ~
This is one of a series of articles, titled:
Questions & Answers About Kindle Publishing at Amazon Self-Publishing Platform
This series is intended for writers publishing to the Kindle for the first time, although those more experienced will also find useful information.
We started at the beginning... with Amazon KDP Help at the Amazon KDP Home Page:
We will continue, every day or so, to answer questions most often asked by new Kindle Self-Publishers.
If you have questions about the current subject... or something not yet covered, feel free to ask in the Comments section at the bottom of any article. (Your personal info remains private... no one else can see it).
To be sure to get the entire series Questions & And Answers for Amazon Kindle Self-Publishers, sign up to receive each new article by email.
To do that, look on the right sidebar of this page, and scroll down about halfway, to the "Sign up for email" box.
As always, your email address will not be shared.