Free Author Tools & Resources
Calculators and guides to help you publish with confidence—built by the DesignDile team.
KDP Spine Width Calculator
Exact spine and full-wrap dimensions for Amazon paperbacks.
Trim Size Guide
Compare 6×9, 5.5×8.5, and other popular trim sizes in inches and mm.
Word Count → Page Count
Estimate how many pages your manuscript will become in print.
KDP Formatting Guidelines Hub
Step-by-step specs for margins, bleed, and upload checks.
Trim size calculator
Inches
6" × 9"
Millimeters (KDP)
152 × 229 mm
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Word count to page count
Estimated print pages (6×9 fiction average)
182
Use our spine calculator for exact cover width.
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Tools help you plan—we deliver print-ready covers and interiors.
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