I have no Kindle ebook sales to speak of, but according to the description:
The Royalties Estimator allows you to estimate your royalties in a single currency of your choice. Because you have at least one book with pages read from Kindle Unlimited, you can estimate the KENP royalties before the KDP Select Global Fund is announced.
The Royalties Estimator is a data analysis tool. Everything on the estimator page is an estimate and won’t match your actual royalty earnings. For official earnings records, see the Prior Months' Royalties and Payments reports.
What do you think of it?