NichelyFree KDP calculators
Quick tools for self-published authors on Amazon. No sign-up.
- KDP royalty calculatorEbook and paperback royalties with 2026 rates and exact printing costs.
- BSR to sales calculatorTurn a Best Sellers Rank into estimated daily and monthly sales.
- Cover size & spine widthFull paperback cover size with bleed, in inches and pixels.
Research a whole niche in one click
Nichely shows the estimated sales, reviews and self-published share of the top 10 books for any keyword on Amazon.
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