As a Professional Member of the CIEP, I base my rates on these recommendations. I assess each project on an individual basis, taking into account deadlines, the type and amount of work the text needs, and the type of client. I realise this can be frustrating, but I do not advertise flat rates because no two projects are the same.
If you send me details about the work you would like me to copyedit or proofread (e.g. word count, figures and illustrations, schedule, type of text, audience, formats), I will be able to give you more detailed information, including a quote. Samples are always very helpful, but please make sure the sample is representative of the overall quality of your work.