Your royalty, not a guess.
For books: Bidavora works out the KDP royalty from format, pages, ink and trim, and keeps each title's ads under the ACoS that still pays you.
What a sale really earns
An illustration, not a customer's numbers: a 300-page black-ink paperback study guide at $24.99 pays about $10.39 in royalty (60% of the price minus about $4.60 printing), so the break-even ACoS is about 42%. Each title can have its own goal.
Format, page count, ink and trim size give the royalty per sale.
Group titles that share a goal; launch new ones with their own ceiling.
Journals, planners and physical products sit next to books with the right margin each.
Made for large backlists
Authors with hundreds of titles get the same checks on every one of them, every hour.
Titles whose ads spend without selling are paused and watched for a late sale.
New titles go live with auto, keyword and similar-product campaigns.
Searches that sell get their own exact campaign.
See it on your own account.
The free audit reads your campaigns and shows the waste in about ten minutes. Automations start with a plan: 14 days free, no card.