Some people charge by the word or by the page for writing and editing. But because every assignment is different, an hourly rate is better for both of us.
The quality of draft copy, the complexity of original material, the amount of research required, and your requirements all affect the time I need to do a thorough job. For that reason, I usually charge by the hour or day. However, I am willing to consider per-project fees as well.
Please contact me to discuss your needs.