Different word processing software will give you a different word count in the very same document. I look at some of the variations today, in my How To column at Copyediting.com.
I created a very short document to test how the software counted a variety of constructions. Below is a chart showing the actual test contents and how each item was counted by the word processor.
|dash — spaced||2||3||2|
|slash / spaced||2||2||2|
|caption||full, including “figure #” tag|
|symbols © ™||1@||1@||0|
|math + 10 ÷ 8 ½||6||6||4|
*Content was exported from the PDF and LaTeX documents because those systems don’t have built-in word counters. Since this is something you might have to do, it was worth testing it anyway.