Ok, quit obsessing. Yes YOU. Quit it right now. Do NOT make Miss Snark get out her Word Ruler and whack you over the head. Cause she will. AND she'll enjoy it.
When you submit your work to an agent, and you need to indicate word count, click the little button on your word processing program that says "word count" and use that number. That's it. Do NOT start counting up pages and multiplying by 25o. Do NOT start obsessing about whether Times New Roman font is bigger/smaller than another font and thus can't adhere to the "250 rule".
Word count is an estimate. It's not like a bank account where you have to balance to the penny. It's not a way to trip you up ...oh my dog, the cover letter said this was 74,002 words but it's really 67,040 so I'm sending it back. Even if you are off by ...gasp...6958 words, no one cares. We just need an idea of where you are on the scale. At this point, I've read enough manuscripts that I can estimate how many words it is by counting the number of typos in the first chapter. The more typos, the more pages. Double points for every misused word. It's an ironclad corollary.
Obsess over your writing instead and you'll be much better off.