Print-on-demand setup
KDP spine width planning guide
Estimate the spine early, then confirm against the final template before uploading.
How to estimate a KDP paperback spine width from page count and paper thickness before checking the final KDP cover template.
Use the estimate before layout
A spine estimate helps you decide whether the spine can carry readable text and how much room the full cover spread needs.
- Enter final or near-final page count.
- Choose a paper thickness that matches the intended paper option.
- Use the printer's generated template as the final authority.
Watch for page count changes
Even modest changes to page count can move the spine enough to affect centered spine text or cover art alignment.
- Recalculate after formatting changes.
- Confirm blank pages and front matter are included.
- Avoid final cover export until the interior PDF is stable.
KDP planning checks
| Step | Why it matters | What to do |
|---|---|---|
| Page count | Drives spine width directly | Use the final interior PDF count. |
| Paper option | Changes thickness | Match white, cream, or color paper assumptions. |
| Template | Defines final upload dimensions | Confirm against the official generated template. |
Always confirm final cover dimensions with your printer or POD platform.
Worked examples
150 pages, 6 x 9 in A planning estimate for a 150-page paperback at a 6 x 9 in trim. 200 pages, 6 x 9 in A planning estimate for a 200-page paperback at a 6 x 9 in trim. 250 pages, 6 x 9 in A planning estimate for a 250-page paperback at a 6 x 9 in trim. 300 pages, 6 x 9 in A planning estimate for a 300-page paperback at a 6 x 9 in trim.