What Kindle Unlimited pays you for pages read — using the rate Amazon actually settled, for the store you sell in.
Every rate this page multiplies by is published, month by month and store by store, on the Kindle Unlimited page-rate history — including which months Amazon has not settled yet.
It multiplies a market rate by a page count you type. It cannot know how far your readers actually got, how much of your KENP came from each store, or what you paid in ads to get those borrows.
TrueRoyalties reads your KDP reports and your Amazon Ads spend and shows the real figures — your own pages read and Kindle Unlimited royalties per book and per store, next to what the advertising cost.