KDP margin calculator
Choose the trim size, page count and bleed. The numbers below are the minimum margins and the exact PDF page size for that paperback.
300 pages is in the 151 to 300 band.
| Measurement | Value |
|---|---|
| Inside (gutter) margin, minimum | 0.5 in (12.7 mm) |
| Top, bottom and outside margin, minimum | 0.25 in (6.4 mm) |
| PDF page size | 6 x 9 in |
| PDF page size, millimetres | 152.4 x 228.6 mm |
| PDF page size, pixels at 300 DPI | 1800 x 2700 px |
| PDF page size, points | 432 x 648 pt |
| Largest text area | 5.25 x 8.5 in |
| Largest text area, millimetres | 133.4 x 215.9 mm |
Source: KDP help, Set Trim Size, Bleed, and Margins; KDP help, Paperback Submission Guidelines. Read on 10 November 2026.
The calculator uses the margin table and bleed rule on the KDP help page: the inside margin depends on the page count, the other three margins on bleed, and the page grows by 0.125 in of width and 0.25 in of height with bleed. Millimetres, pixels, points and the text area are worked out here (1 in = 25.4 mm = 72 points; 300 pixels per inch). An odd page count is rounded up to the next even number, as KDP does.
All page counts
| Page count | Inside margin (gutter) | Top, bottom, outside: no bleed | Top, bottom, outside: with bleed |
|---|---|---|---|
| 24 to 150 | 0.375 in (9.6 mm) | at least 0.25 in (6.4 mm) | at least 0.375 in (9.6 mm) |
| 151 to 300 | 0.5 in (12.7 mm) | at least 0.25 in (6.4 mm) | at least 0.375 in (9.6 mm) |
| 301 to 500 | 0.625 in (15.9 mm) | at least 0.25 in (6.4 mm) | at least 0.375 in (9.6 mm) |
| 501 to 700 | 0.75 in (19.1 mm) | at least 0.25 in (6.4 mm) | at least 0.375 in (9.6 mm) |
| 701 to 828 | 0.875 in (22.3 mm) | at least 0.25 in (6.4 mm) | at least 0.375 in (9.6 mm) |
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Questions
How does KDP decide the inside margin?
By page count only: 0.375 in for 24 to 150 pages, 0.5 in for 151 to 300 pages, 0.625 in for 301 to 500 pages, 0.75 in for 501 to 700 pages, 0.875 in for 701 to 828 pages. The trim size does not change it.
Are these the margins I should use?
They are the published minimums, read on 10 November 2026. Wider margins are allowed and usually read better. Text that touches a minimum exactly can still be flagged, so leave a little room.
Does bleed change the inside margin?
No. Bleed raises the top, bottom and outside minimum from 0.25 in to 0.375 in and makes the page 0.125 in wider and 0.25 in taller. The inside margin stays the same.
Can I put this calculator on my own site?
Yes. Copy the code under "Put this calculator on your site". It is free, loads from this site and sends nothing about your visitors except an anonymous count that it was used.
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