A copy edit is typically priced according to the length of the document and the amount of time it will take to complete.
In general, copy editing rates are calculated at a rate of either a per-word or per-page rate. Per-word rates usually range from between 0.02 per word to 0.10 per word, depending on the complexity and experience of the editor. Per-page editing fees typically range from $50 to $150 per page, depending on the type of document, the amount of editing the document needs, and the speed with which the edit is required.
For example, a full proof read and edit of a 10-page document may cost between $550 and $7,500 depending on the complexity of the document and the speed at which it needs to be edited. Copy editing, however, is not the same as proofreading; proofreading is the final step to ensure no errors remain after the copy edit.
The best way to determine what’s best suited for your project is to discuss your project with multiple editors to determine the level of editing and the cost involved.
You can find more information about professional editing services here. https://www.cmfcevents.org/blog/what-you-need-to-know-about-professional-editing-services/