Herramientas gratuitas para autores
Quick utilities for KDP publishers. No account required.
Plan your paperback and ebook before you format. Use these free calculators for page count, margins, spine width, cover dimensions, print cost, and typography — then export KDP-ready files in Manusly.
Manuscript & layout planning
Estimate page count and margins before you lock trim size and cover design.
Cover & print specs
Spine width, full-wrap cover size, and print cost estimates for paperback planning.
KDP Spine Width Calculator
Estimate paperback spine width from page count and paper type.
FreeKDP Cover Size Calculator
Estimate full-wrap paperback cover width and height from trim, page count, bleed and paper type.
FreeKDP Print Cost Estimator
Estimate paperback printing cost from marketplace, ink type and page count. Verify final pricing with KDP.
Typography
Preview body fonts before you embed them in your print and ebook files.
All free author tools
Every calculator and utility on this page. Bookmark this hub for quick access.
- KDP Print Page Count Calculator Estimate paperback page count from word count and trim size before uploading to Amazon KDP.
- Book Margin & Gutter Calculator Estimate practical inside, outside, top and bottom margins from page count and trim size.
- KDP Spine Width Calculator Estimate paperback spine width from page count and paper type.
- KDP Cover Size Calculator Estimate full-wrap paperback cover width and height from trim, page count, bleed and paper type.
- KDP Print Cost Estimator Estimate paperback printing cost from marketplace, ink type and page count. Verify final pricing with KDP.
- Book Font Preview Tool Preview sample book paragraphs in classic serif and readable sans-serif typefaces.
Related guides
Frequently asked questions
Ready to format your book?
Open the free online editor — apply themes and export KDP-ready files.
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