8.5" × 11" Paperback Cover Dimensions: 400 Pages, B&W White
PDF Width
18.1508"
1306.86 pt
PDF Height
11.2500"
810.00 pt
Spine Width
0.9008"
64.86 pt
How These Dimensions Are Calculated
spine_width = 400 pages × 0.002252" = 0.9008"
pdf_width = (2 × 8.5") + 0.9008" + 0.25" = 18.1508"
pdf_height = 11" + 0.25" = 11.2500"
pdf_width = (2 × 8.5") + 0.9008" + 0.25" = 18.1508"
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 0.9008"] [Front Cover 8.5"] [0.125" bleed]
Key Specifications
- Trim size: 8.5" × 11"
- Page count: 400 pages
- Paper type: Black & White 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 | 18.1508" | 1306.86 | 461.03 mm | 5445 px |
| PDF Height | 11.2500" | 810.00 | 285.75 mm | 3375 px |
| Spine Width | 0.9008" | 64.86 | 22.88 mm | 270 px |
Between 300 and 499 pages at a large trim (7" × 10"), this configuration matches standard textbook dimensions used widely in college courses and professional training programs. Spine widths of 0.68"–1.12" allow full spine branding. At 300 pages, the total PDF width is about 14.6756" — a large print file that requires careful resolution checking. Publishers in the technical, medical, and academic sectors frequently use these exact specifications. Verify available trim sizes against KDP's current list, as not all large-format sizes accept every ink type.