KDP margins and trim sizes in mm and cm
KDP's inside margin runs from 9.6 mm to 22.3 mm by page count. The other margins are at least 6.4 mm, or 9.6 mm with bleed. Bleed is 3.2 mm.
Margins in millimetres
| Page count | Inside margin, mm | Inside margin, cm | Inside margin, in |
|---|---|---|---|
| 24 to 150 | 9.6 mm | 0.96 cm | 0.375 in |
| 151 to 300 | 12.7 mm | 1.27 cm | 0.5 in |
| 301 to 500 | 15.9 mm | 1.59 cm | 0.625 in |
| 501 to 700 | 19.1 mm | 1.91 cm | 0.75 in |
| 701 to 828 | 22.3 mm | 2.23 cm | 0.875 in |
| Margin or bleed | Millimetres | Inches |
|---|---|---|
| Top, bottom, outside: no bleed | at least 6.4 mm | 0.25 in |
| Top, bottom, outside: with bleed | at least 9.6 mm | 0.375 in |
| Bleed at the top, bottom and outside edge | 3.2 mm | 0.125 in |
| Bleed at the spine edge | none | none |
Source: KDP help, Set Trim Size, Bleed, and Margins. Read on 10 November 2026.
The millimetre figures in these two tables are the ones KDP prints next to the inches. KDP rounds them up (0.375 in is 9.525 mm; it prints 9.6 mm), so a design that meets the millimetre figure also meets the inch figure.
Trim sizes in millimetres and centimetres
| Trim size, in | Trim size, mm | Trim size, cm | Page with bleed, mm | Page with bleed, cm |
|---|---|---|---|---|
| 5 x 8 in | 127 x 203.2 mm | 12.7 x 20.32 cm | 130.2 x 209.6 mm | 13.02 x 20.96 cm |
| 5.06 x 7.81 in | 128.5 x 198.4 mm | 12.85 x 19.84 cm | 131.7 x 204.7 mm | 13.17 x 20.47 cm |
| 5.25 x 8 in | 133.4 x 203.2 mm | 13.34 x 20.32 cm | 136.5 x 209.6 mm | 13.65 x 20.96 cm |
| 5.5 x 8.5 in | 139.7 x 215.9 mm | 13.97 x 21.59 cm | 142.9 x 222.3 mm | 14.29 x 22.23 cm |
| 6 x 9 in | 152.4 x 228.6 mm | 15.24 x 22.86 cm | 155.6 x 235 mm | 15.56 x 23.5 cm |
| 6.14 x 9.21 in | 156 x 233.9 mm | 15.6 x 23.39 cm | 159.1 x 240.3 mm | 15.91 x 24.03 cm |
| 6.69 x 9.61 in | 169.9 x 244.1 mm | 16.99 x 24.41 cm | 173.1 x 250.4 mm | 17.31 x 25.04 cm |
| 7 x 10 in | 177.8 x 254 mm | 17.78 x 25.4 cm | 181 x 260.4 mm | 18.1 x 26.04 cm |
| 7.44 x 9.69 in | 189 x 246.1 mm | 18.9 x 24.61 cm | 192.2 x 252.5 mm | 19.22 x 25.25 cm |
| 7.5 x 9.25 in | 190.5 x 235 mm | 19.05 x 23.5 cm | 193.7 x 241.3 mm | 19.37 x 24.13 cm |
| 8 x 10 in | 203.2 x 254 mm | 20.32 x 25.4 cm | 206.4 x 260.4 mm | 20.64 x 26.04 cm |
| 8.25 x 6 in | 209.6 x 152.4 mm | 20.96 x 15.24 cm | 212.7 x 158.8 mm | 21.27 x 15.88 cm |
| 8.25 x 8.25 in | 209.6 x 209.6 mm | 20.96 x 20.96 cm | 212.7 x 215.9 mm | 21.27 x 21.59 cm |
| 8.5 x 8.5 in | 215.9 x 215.9 mm | 21.59 x 21.59 cm | 219.1 x 222.3 mm | 21.91 x 22.23 cm |
| 8.5 x 11 in | 215.9 x 279.4 mm | 21.59 x 27.94 cm | 219.1 x 285.8 mm | 21.91 x 28.58 cm |
| 8.27 x 11.69 in | 210.1 x 296.9 mm | 21.01 x 29.69 cm | 213.2 x 303.3 mm | 21.32 x 30.33 cm |
This table is converted here from the inch sizes (1 in = 25.4 mm) and rounded to 0.1 mm, or 0.01 cm. KDP's own centimetre list is rounded differently in places: for the 5.125 x 8.25 in page it prints 13.01 x 20.96 cm where this table has 13.02 x 20.96 cm, and for the 7.565 x 9.94 in page it prints 19.2 x 25.21 cm where this table has 19.22 x 25.25 cm. Set the design in inches if your tool allows it; if it only takes millimetres, use the figures above and check the exported PDF, which is measured in inches.
Check the page size of your PDF
Questions
What is the KDP inside margin in mm?
9.6 mm for 24 to 150 pages, 12.7 mm for 151 to 300 pages, 15.9 mm for 301 to 500 pages, 19.1 mm for 501 to 700 pages, 22.3 mm for 701 to 828 pages. These are the millimetre figures printed in the KDP margin table.
What is 6 x 9 in in mm and cm?
152.4 x 228.6 mm, or 15.24 x 22.86 cm. With bleed the page is 155.6 x 235 mm.
Is A5 a KDP trim size?
A5 (148 x 210 mm) is not in the list of 16 sizes on the US help page. A custom paperback size is allowed when the width is 101.6 to 215.9 mm and the height 152.4 to 296.9 mm, and A5 is inside that range. A4 (8.27 x 11.69 in) is in the list.