5x8 KDP Paperback Cover Size & Spine Width Guide
5x8 is a popular trim size for pocketable KDP paperbacks like compact novels and travel guides. This guide explains the exact cover dimensions and spine width for 5x8 paperbacks, using a 100‑page example.
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When to choose 5x8 for KDP paperbacks
5x8 works best when portability matters as much as readability. It is a natural choice for pocket novels, novellas, travel guides and any book readers might carry in a bag or coat pocket.
5x8 pocket novel example (100 pages)
- Trim size: 5.0 x 8.0"
- Spine width: 0.225"
- Full PDF size: 10.475" × 8.25"
- Paper type: White Paper
At 100 pages, the 5x8 spine is thick enough for a short title and author name while still keeping the book comfortable to hold. The compact footprint also reduces printing cost compared to larger formats.
Need a different size?
How 5x8 KDP pocket book dimensions are calculated
The trim size for 5x8 paperbacks is fixed at 5" × 8". Only the spine width and the total PDF width change when you change page count or paper type.
| Use case | Pages | Trim size | Spine width | Full PDF size |
|---|---|---|---|---|
| Pocket novel / travel guide example | 100 | 5.0 x 8.0" | 0.225" | 10.475" × 8.25" |
| Travel guide | 250 | 5.0" × 8.0" | 0.563" | 10.813" × 8.25" |
For example, a 100-page 5x8 KDP paperback on White Paper uses a 5.0 x 8.0" trim, a 0.225" spine and a final cover PDF size of 10.475" × 8.25" including bleed.
In practice, you can treat 5x8 as: full cover width = 2 × 5" + spine width + 0.25" bleed, and height = 8" + 0.25" bleed.
How to use this 5x8 size guide
Pick 5x8 for portable booksChoose 5x8 when you want a compact paperback that readers can easily carry.
Calculate exact dimensionsUse the KDP Cover Size Calculator with your page count and paper type to get full width/height and spine width for 5x8.
Keep spine text minimalDesign with very short spine text so titles stay legible on the narrow 5x8 spine.
Export a print-ready PDFExport a 300 DPI print-ready PDF and regenerate the template if your page count changes.