KDP Spine Width Formula (0.002252 White Paper)
Quick reference for the constant 0.002252 (white paper) used in KDP spine width calculation.
Quick answer
0.002252 is the white paper thickness factor (inches per page). Quick estimate: spine width ≈ page count × 0.002252 (white).
Formula
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 | 11.44 |
| 300 | 0.676 | 17.16 |
These examples estimate spine width only. Download templates for full-wrap sizes (trim + bleed).
FAQ
What is 0.002252?
Where does the 0.002252 value come from?
Why are there different factors for white, cream, and color?
Can I download a ready-made cover template?
Related Resources
Pick a trim size and download a ready-made cover template.
Download a full-wrap cover template for KDP 6×9 paperback.
Download a full-wrap cover template for KDP 8.5×11 paperback.
Download a cover template for KDP 6×9 hardcover.
Tip: If your page count changes, recalculate before export — spine width changes with pages.