Rates vary according to the complexity of the material and are based on a sample of the work to be indexed.
I tend to be thorough in my indexing. For scholarly work, rates range from $3.50 to $5.00 per indexable page. Catalogues and trade books typically range from $2.50 to $4.00. Indexable pages are typically those of the book's introduction, main body, and captioned illustrations or tables. They usually do not include tables of contents, photo credits, bibliographical materials, or pages with no indexable text.

Unusual publishing demands sometimes result in higher rates. These include, but are not limited to, excessively tight deadlines, changes in pagination after the indexer has submitted the index, and inability or refusal to submit drafts with final pagination.