Tool updated September 18, 2026

KDP cover calculator changelog

September 18, 2026

Launch-ready calculator and maintenance history

Prepared the calculator for public launch with clearer controls, stronger guidance, and visible maintenance updates.

Added interior type, paper type, reading direction, measurement units, and expanded trim-size selections.
Added accurate KDP FAQs, common cover-sizing mistakes, and dedicated search metadata.
Added this maintenance changelog and the latest-update status shown on the tool page.

September 17, 2026

Added locally generated guide templates that can be used in common cover-design applications.

Added SVG and PNG downloads with bleed, trim, safe-area, spine, and barcode guides.
Made PNG generation compatible with ReviewBunch's Content Security Policy.
Added right-to-left template ordering and descriptive download filenames.

September 16, 2026

Aligned paperback calculations and validation with Amazon's published submission guidance.

Added white, cream, groundwood, standard-color, and premium-color configurations.
Added trim-specific page ranges, even-page validation, metric conversion, and spine-text guidance.
Verified reference outputs for common 5 × 8, 6 × 9, and 8.5 × 11 inch covers.

September 15, 2026

Introduced instant paperback and Kindle eBook cover dimensions with a live visual preview.

Added paperback spine, bleed, full-wrap, millimeter, and 300-DPI pixel calculations.
Added Kindle eBook dimensions and image-requirement guidance.
Added copyable results and a responsive cover-layout diagram.