Page count is relative. In the era of digital eReaders where the audience can adjust the text size, spacing, margins and fonts, the actual type-set pages that we would normally judge a book on for length are becoming obsolete unless you have a physical edition that you are converting to Kindle. For myself, I end up going the opposite - taking my Kindle version and converting it for print using Scrivener with the correct layout and dimensions for CreateSpace. I was very pleased with how my first book came out and I'm sure that I will definitely use CreateSpace again in the near future. Check out the image below of how my physical book came out.
Back to the initial post topic - I've got some estimates based on my own work that might help with your own dilemmas of figuring out how "long" your book is once you upload it to KDP.
For my shorter work, about 8,000 or so words, KDP estimated my book was roughly 41 pages. This includes an internal cover and title page with table of contents. Not bad for a short book. I also recently finished up a short prequel story to my Macyntire & Hough novel that was just shy of 7,000 words, and KDP estimated this as being 32 pages long, again, including cover, title page, and table of contents.
While it's not exact, that equals roughly 218 words per page. Pretty close to my estimate of 250 words for my own calculations.
If you're really concerned with readers being unaware of how long your book is, you can always put in the description how many words (approximately) the book is. The tech-savvy readers will pick up on that and hopefully be more tempted to give you work a chance.