8.5" × 11" Paperback Cover Dimensions: 400 Pages, Premium Color
PDF Width
18.1888"
1309.59 pt
PDF Height
11.2500"
810.00 pt
Spine Width
0.9388"
67.59 pt
How These Dimensions Are Calculated
spine_width = 400 pages × 0.002347" = 0.9388"
pdf_width = (2 × 8.5") + 0.9388" + 0.25" = 18.1888"
pdf_height = 11" + 0.25" = 11.2500"
pdf_width = (2 × 8.5") + 0.9388" + 0.25" = 18.1888"
pdf_height = 11" + 0.25" = 11.2500"
The 0.25" added to both width and height accounts for 0.125" bleed on each side. Your cover image must extend into this bleed area to avoid white edges after trimming.
Cover Layout (Left to Right)
[0.125" bleed] [Back Cover 8.5"] [Spine 0.9388"] [Front Cover 8.5"] [0.125" bleed]
Key Specifications
- Trim size: 8.5" × 11"
- Page count: 400 pages
- Paper type: Premium Color on White Paper
- Bleed: 0.125" on all outer edges
- Safe margin: 0.25" inside trim line
- Spine text: Allowed (400 ≥ 79 pages)
- Barcode reserve: 2" × 1.2" on back cover
- Resolution: 300 DPI, RGB color space
Dimensions in Multiple Units
| Measurement | Inches | Points (pt) | Millimeters | Pixels (300 DPI) |
|---|---|---|---|---|
| PDF Width | 18.1888" | 1309.59 | 462.00 mm | 5457 px |
| PDF Height | 11.2500" | 810.00 | 285.75 mm | 3375 px |
| Spine Width | 0.9388" | 67.59 | 23.85 mm | 282 px |