Bonus 05: KDP's Performance Algorithm — What the Data Says About Your 90-Day Window
Every self-published author has heard about the "90-day cliff" — but most of what gets repeated is half-truths. In this data-driven bonus episode, Kevin breaks down how Amazon's KDP algorithm actually evaluates your book, what the research says about the 90-day window, and how to use it to your advantage. Backed by 17 cited sources including Amazon's own documentation, advertising benchmarks, and practitioner case studies.
⏱️ Duration: ~15 min
🎧 Listen Now
In This Episode
How KDP's algorithm actually ranks books — sales velocity (~40%), conversion rate (~25-30%), CTR (~15%), and engagement signals
The 3 phases of the 90-day window — the 30-day New Release boost, the judgment period, and the make-or-break establishment phase
Why consistency beats spikes — with real client data showing sustained daily sales outperforming big launch-day numbers
A full 6-week launch timeline starting before publication day
Free promotions vs. Kindle Countdown Deals — including the 70% royalty advantage below $2.99
Why A+ Content should be live before launch — Amazon's data shows up to 8% sales increase and 3-10% conversion lift
The 5-step rank recovery playbook for when your book loses rank
The 90-day KDP Select relaunch cycle that keeps books relevant
📚 Key Sources Cited
Amazon KDP Official Documentation — Sales Ranking
Amazon A+ Content Guide (2023) & 100K ASIN Study
HillTree Press — KDP Algorithm Ranking Guide (2026)
Ad Badger — Amazon Advertising Benchmarks (2026)
HMD Publishing — Sales Velocity Case Study (2025)
Full list of 17 sources available in the show notes
Enjoyed this episode? Subscribe to the podcast and never miss a new release. Share it with a fellow indie author who's about to launch!
Comments