Free Amazon Ads tools for Kindle authors

Every tool counts Kindle Unlimited page reads and series read-through, because that's where most of a KU author's ad return hides. All free, no signup.

Free tool
Kindle Author Ads Analyzer
Upload your search term report: negatives, bid changes and harvest keywords judged on series profit.
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Free tool
Break-even ACoS calculator for a series
Your real break-even ACoS once KU page reads and read-through count.
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Free tool
KENP calculator
Turn Kindle Unlimited pages read into royalties, at any month's rate.
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Free tool
ACoS calculator for KDP authors
ACoS, ROAS and true ACoS for a book ad, side by side.
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Free tool
Read-through calculator
Read-through by book and what one new reader is worth across the series.
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Free tool
Amazon Ads bid calculator for authors
The most you can pay per click and still profit across the series.
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Data
KENP rate by month (2025-2026)
The Kindle Unlimited per-page rate for every month, with month-over-month change.
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