I follow the rates suggested by the Chartered Institute of Editing and Proofreading. Every commission is unique, with varying word-count, degree of intervention required and timescale for completion, so I prefer to provide a personalised quote, rather than rely on a standard fixed price.
As a rough guide, I charge a minimum of £0.035 per word for a 7-day turnaround for a track-changed version of your Word document and £40 per hour for 1-2-1 feedback via video-call.
I calculate an accurate, bespoke quote for written work based on a sample of your text and a description of your requirements. If you'd like more information on how I may be able to help you and how much it may cost, please get in touch via the contact page.