KDP Spine Width Formula (0.002252 White Paper)

Quick reference for the constant 0.002252 (white paper) used in KDP spine width calculation.

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Quick answer

For KDP spine width, 0.002252 is the white paper thickness factor in inches per page. Quick estimate: KDP spine width ≈ page count × 0.002252 for black-and-white white paper.

Formula

Spine width (in) = Page count × Paper factor (in/page)

Use a different factor for cream or color paper. For exact cover dimensions (trim + bleed), use the calculator.

Paperback paper factors (inches per page)

Paper	Factor (in/page)	Factor (mm/page)
B&W — White	0.002252	0.06
B&W — Cream	0.0025	0.06
Color	0.002347	0.06

Examples (white paper)

Spine width estimates for common page counts using the white paper factor (0.002252).

Pages	Spine (in)	Spine (mm)
100	0.225	5.72
200	0.450	11.43
300	0.676	17.17

These examples estimate spine width only. Download templates for full-wrap sizes (trim + bleed).

KDP spine width and full-cover formula cheat sheet

Item	Formula	Practical note
Paperback spine width	Spine width = page count x paper factor	Use 0.002252 in/page for black-and-white white paper, then recalculate if page count or paper type changes.
Full cover width	Full cover width = back cover width + spine width + front cover width + 0.25 in bleed	The 0.25 in adds 0.125 in bleed on the left and 0.125 in bleed on the right.
Full cover height	Full cover height = trim height + 0.25 in bleed	The 0.25 in adds 0.125 in bleed at the top and 0.125 in bleed at the bottom.

Official KDP sources

FAQ

What is 0.002252?

It's the white paper thickness factor (inches per page) used to estimate KDP paperback spine width.

Where does the 0.002252 value come from?

It is based on KDP spine width calculation guidance (often referenced as the “spine width calculation white paper”). Always verify with the latest KDP documentation.

Why are there different factors for white, cream, and color?

Different paper types have different thickness per page, so the factor changes.

Can I download a ready-made cover template?

Yes. Visit KDP Cover Templates, pick your trim size, and download a template instead of calculating manually.

KDP Cover Templates (Download)

Pick a trim size and download a ready-made cover template.

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6" × 9" Paperback Template

Download a full-wrap cover template for KDP 6×9 paperback.

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8.5" × 11" Paperback Template

Download a full-wrap cover template for KDP 8.5×11 paperback.