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Many professional writers and editors report that there is about a 25% loss between the first finished (!) draft and the final draft. Depending on your approach (e.g. either outlining or pantsing)...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/38776 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Many professional writers and editors report that there is about a 25% loss between the first finished (!) draft and the final draft. Depending on your approach (e.g. either outlining or pantsing) and your experience as a writer (is this the first book you write and you have to find out how to do it as you go along, or do you know the next steps?), your very first draft may be very different from the first finished draft, or it may be the first finished draft. Since you plan to add in material, it seems to me that you are both inexperienced and didn't plan your story beforehand (at least not in detail), which makes guessing the final wordcount rather impossible. * * * Please not the difference between "first draft" (which is the first version of your story that you write) and "first finished draft" (which is what you send in to your editor or agent).