I found a nifty little thing yesterday, I shared it on my FB but then figured it would work really good here as well. 

If you know how many words you have, but not sure how many pages that equals out to, this will let you know. Going by font and size as well as spacing, it also has it's own section where you can start writing your document to keep track - or paste what you have already - to find out. 

I had put in a random number to show an example 

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Further down the page it also lets you in on how many pages so many odd words are (using an Arial font size 12, double spaced) - Like this: 

How many pages is 500 words? 500 words is approximately 1.8 pages.
How many pages is 750 words? 750 words is approximately 2.7 pages.
How many pages is 1,000 words? 1,000 words is approximately 3.7 pages.
How many pages is 1,250 words? 1,250 words is approximately 4.6 pages.
How many pages is 1,500 words? 1,500 words is approximately 5.5 pages.

Then it flips the counter, using the same parameters, telling you how many words is on a page, like this: 

How many words are in one page? There are approximately 450 words in one page.
How many words are in two pages? There are approximately 900 words in two pages.
How many words are in three pages? There are approximately 1350 words in three pages.
How many words are in four pages? There are approximately 1800 words in four pages.
How many words are in five pages? There are approximately 2250 words in five pages.

Both go down further, I just went to '5' 

{For the record, trying to do the math for the word count on my own book, is a pain in the #$^&*#$} 

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Right, so, here's the link: https://wordcounter.net/words-per-page 

I'll also put it in as an external link so it's easier to use, since WP is weird