Work out your break-even
This calculator invents nothing. Every number below is one you type in, from your own royalty report and your own ad dashboard. It does the arithmetic and nothing else — and it does it in your browser, so no figure you enter is uploaded or stored.
The number this calculator cannot give you
It can tell you how many copies pay for the ad. It cannot tell you whether the ad will land — that depends on whether your creative speaks to the readers actually in your lane. That is what the rest of Book Ad Pack does, and you can start free: Reader Intel gives you your lane, live demand and your real comps at no cost.
Why this comes from real data
The reader-demand corpus behind the paid Ad Pack’s ad-copy scoring, Blurb Shelf Check and Reader Intel holds these counts (this tool runs in your browser and does not use it). They are live table counts, not marketing rounding — we count them ourselves and we publish the count.
Counted from live tables on 9 October 2026 (internal audit run IN-0823-2026-10-09). We never publish a customer's book, name or data — every figure above is a whole-corpus aggregate. Compared with template tools such as Canva, Placeit and BookBrush: you supply the cover and the words, and they lay them out. Our paid Ad Pack starts from your manuscript (or your book’s listing where none is supplied).
More free tools across the estate
Book Ad Pack is one of five sites run by Coral Hart Group on a shared reader-demand spine. These are the other free, no-signup tools and data views worth your time.