---
title: "covers · Blog | Once Books"
description: "1 post tagged “covers” on the Once Books blog, newest first: KDP spine width and cover size: the exact formula."
source: "https://www.oncebooks.com/blog/tag/covers"
---

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Topic

# Covers

1 post on this topic.

- [6 October 2026 · 7 min read](https://www.oncebooks.com/blog/kdp-cover-size-and-spine-width) — KDP spine width and cover size: the exact formula How to calculate KDP spine width and full-wrap cover size: the per-page paper multipliers, the bleed maths, three worked examples and the common mistakes.

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