Free Book Ads ROI Calculator
Analyze your Amazon Ads, Facebook, or BookBub campaigns — ACOS, ROAS, break-even points, and maximum profitable bids in one dashboard.
Campaign Data
Book Economics
Campaign Verdict
Your ACOS (83.4%) is above your break-even ACOS (35.0%) — you're losing money on direct sales. Lower bids toward your max profitable bid of $0.28, pause underperforming keywords, or improve your conversion rate (cover, description, reviews).
Works for Amazon Ads, Facebook/Meta Ads, and BookBub campaigns — just plug in the spend and results from each platform's dashboard. Remember that ads also drive unattributed organic sales and read-through on series, so a slightly-above-break-even ACOS can still be worthwhile.
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Frequently Asked Questions
What is a good ACOS for a book campaign?
It depends on your royalty margin — a campaign is profitable whenever your ACOS is below your break-even ACOS, which this calculator computes automatically from your list price and royalty.
Does this work for Facebook and BookBub ads too?
Yes — plug in the spend, clicks, and orders from any platform's dashboard; the ROI math is the same regardless of ad network.
Should I count Kindle Unlimited reads in my ROI?
Yes, if the reads are attributable to the campaign — add them to the optional KU earnings field so they count toward your profit total.