Free Author Tools
Every calculator a KDP author reaches for, in one place, free.
No account, no email wall, no watermark. Built and maintained by Boocu.
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KDP Royalty Calculator
35% vs 70% plans, delivery fees, and monthly earnings — know what Amazon actually pays you per sale.
Spine Width & Cover Size Calculator
Exact paperback spine width and full-cover canvas size (with bleed, in inches, mm and pixels) for your cover designer.
KENP / Kindle Unlimited Calculator
Estimate your KENPC page count and what Kindle Unlimited page reads earn you per month.
BSR → Sales Estimator
Turn any Kindle Best Sellers Rank into estimated daily and monthly sales.
Word Count → Page Count
How many printed pages is your manuscript at each trim size — plus reading time and length class.
Book Description HTML Formatter
Write with simple markup, copy KDP-safe HTML with live preview and the 4,000-character limit tracked.
Copyright Page Generator
A clean, professional copyright page for your front matter in thirty seconds.
Book Link & QR Code Generator
Clean Amazon links for every marketplace from one ASIN, plus a downloadable QR code for print.
Pen Name Generator
Genre-tuned pseudonyms — roll until one feels like you.
Premium: AI Manuscript Tools
The Novel Audit reads your whole manuscript and reports logic bugs, plot holes, timeline errors and character inconsistencies — every finding cited to the scene. Plus the Blurb Doctor and First Chapter Critique. Free author accounts include 3 credits, enough for a full audit.