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
🔭 Coming soon
KDP Niche Explorer
Research any Amazon book niche before you publish — demand, competition, and estimated sales. Join the waitlist for early access and a launch discount.
Join the waitlist →Deep Dive Guides
IngramSpark Error Messages
Decode every IngramSpark rejection in plain English. Find out what each error means and exactly how to fix it before your next upload.
Read full guide →Affinity Publisher & IngramSpark
Your Affinity Publisher default black is 295% ink coverage — over IngramSpark's 240% limit. Learn exactly how to fix it in 30 seconds.
Read full guide →Canva 300 DPI Trap Explained
Canva says 300 DPI but IngramSpark still flags low resolution? Here's exactly why and what actually fixes it.
Read full guide →