Cover Dimension Calculator
Get the exact pixel dimensions and file specs for your book cover — front, back, spine, and full wrap — based on your page count, trim size, and paper stock.
Cover Dimensions
Now check your cover PDF before uploading
Wrong dimensions + low-res images = instant rejection. BookReady catches both in 30 seconds.
Spine Width Calculator
Know your exact spine width before ordering your cover. Wrong spine = rejected cover. Enter your page count and see widths for all paper stocks.
Spine Width by Paper Stock
| Paper Stock | PPI | Spine Width | In mm | Status |
|---|
Got your spine width? Now check your interior PDF.
18 compliance checks — fonts, bleed, color, PDF/X. Catches what IngramSpark will reject.
Word Count → Page Count
Estimate how many pages your manuscript will be at common trim sizes and font settings. Useful for calculating spine width before your file is formatted.
Page Count Estimate
| Trim Size | Est. Pages | Spine (white) | Spine (cream) |
|---|
Ready to format? Check your PDF before uploading.
Catches the errors formatters miss — ICC profiles, font embedding, bleed, PDF/X.
KDP Print vs IngramSpark
Not sure which platform to use? Answer a few questions and we'll tell you which is the better fit for your book — or whether you should use both.
Platform Recommendation
IngramSpark
KDP Print
Now make sure your PDF meets their requirements.
IngramSpark has stricter requirements than KDP — BookReady checks all 18 in 30 seconds.
Trim Size Guide
Which trim size is right for your book? Here's what each genre typically uses and what the major platforms support.
| Trim Size | Best For | IngramSpark | KDP Print | Notes |
|---|---|---|---|---|
| 5" × 8" | Fiction, romance, YA | ✓ | ✓ | Popular for romance & genre fiction |
| 5.25" × 8" | Fiction | ✓ | ✓ | Slightly wider, good for longer books |
| 5.5" × 8.5" | Fiction, nonfiction | ✓ | ✓ | Very common all-around size |
| 6" × 9" | Nonfiction, business, memoir | ✓ | ✓ | Most popular nonfiction size |
| 4.25" × 6.87" | Mass market paperback | ✓ | Limited | Classic mass market feel |
| 7" × 10" | Workbooks, textbooks | ✓ | ✓ | Good for heavy content with graphics |
| 8.5" × 11" | Cookbooks, art books, journals | ✓ | ✓ | Large format — color printing costs more |
| 6" × 9" Hardcover | All genres | ✓ | Case laminate only | IngramSpark has more hardcover options |
📚 For romance & dark romance: 5" × 8" or 5.5" × 8.5" are the standard. They feel like traditionally published novels in hand, which readers expect. 6" × 9" reads as "self-help" and can feel off to romance readers.
💡 Pro tip: Once you pick your trim size, use the Cover Calculator above to get your exact cover dimensions before you brief your designer. Wrong dimensions = rejected cover file.
Stop getting rejected
Your PDF is ready.
Is it actually upload-ready?
Is it actually upload-ready?
18 compliance checks · IngramSpark, KDP, B&N Press · fixed PDF included · $9
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Check is free · pay $9 only to download the fixed file