OneTaskBy Tim King · Updated
Print Bleed Calculator
Document Size With Bleed, Safe Area and Pixels
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How the Print Bleed Calculator works
This print bleed calculator takes the finished trim size of a flyer, card or poster and adds bleed to every edge. It shows the document size to set up, the safe area to keep text inside, and the pixel dimensions an image needs at 300 DPI or any resolution you choose. It works in millimetres or inches.
Printers print on oversized sheets and cut them down. The blade can drift by a millimetre or so, so any colour or photo that runs to the edge must extend past the cut line, or a thin white sliver can show. That extra area is the bleed. The safe margin works the other way: it keeps text and logos far enough inside the cut that a small shift never clips them.
How the print bleed calculator works
The formula adds bleed to both sides of each dimension: document width = trim width + 2 × bleed, and the same for height. The safe area is the trim size minus 2 × the safe margin. Pixel dimensions use pixels = inches × DPI, with millimetres divided by 25.4 first, and are rounded up so the image never falls short.
First example. An A4 leaflet is 210 × 297 mm. With 3 mm bleed the document is 216 × 303 mm, which at 300 DPI needs 2552 × 3579 px. The trim alone is 2481 × 3508 px, each bleed edge adds 36 px, and a 5 mm safe margin leaves a 200 × 287 mm area for text.
Second example. A US business card is 3.5 × 2 in. With the usual 0.125 in bleed the document is 3.75 × 2.25 in, or 1125 × 675 px at 300 DPI.
Third example. A European business card is 85 × 55 mm. With 3 mm bleed it becomes 91 × 61 mm, which needs 1075 × 721 px at 300 DPI.
How many millimetres of bleed? Most UK and European printers ask for 3 mm per edge, and US printers for 0.125 in, which is 3.175 mm. Large posters and banners may need 5 mm or more, and books with thick covers ask for extra on the wrap.
Common print sizes with 3 mm bleed and the pixel size needed at 300 DPI
| Format | Trim (mm) | With 3 mm bleed (mm) | Pixels at 300 DPI |
|---|---|---|---|
| Business card (UK, EU) | 85 × 55 | 91 × 61 | 1075 × 721 |
| Business card (US) | 88.9 × 50.8 | 94.9 × 56.8 | 1121 × 671 |
| Credit card size | 85.6 × 54 | 91.6 × 60 | 1082 × 709 |
| A7 | 74 × 105 | 80 × 111 | 945 × 1312 |
| A6 postcard or flyer | 105 × 148 | 111 × 154 | 1312 × 1819 |
| 4 × 6 in postcard | 101.6 × 152.4 | 107.6 × 158.4 | 1271 × 1871 |
| 5 × 7 in card | 127 × 177.8 | 133 × 183.8 | 1571 × 2171 |
| DL leaflet | 99 × 210 | 105 × 216 | 1241 × 2552 |
| A5 flyer | 148 × 210 | 154 × 216 | 1819 × 2552 |
| Half Letter | 139.7 × 215.9 | 145.7 × 221.9 | 1721 × 2621 |
| US Letter | 215.9 × 279.4 | 221.9 × 285.4 | 2621 × 3371 |
| A4 | 210 × 297 | 216 × 303 | 2552 × 3579 |
| US Legal | 215.9 × 355.6 | 221.9 × 361.6 | 2621 × 4271 |
| Tabloid (11 × 17 in) | 279.4 × 431.8 | 285.4 × 437.8 | 3371 × 5171 |
| A3 | 297 × 420 | 303 × 426 | 3579 × 5032 |
| SRA3 sheet | 320 × 450 | 326 × 456 | 3851 × 5386 |
| 18 × 24 in poster | 457.2 × 609.6 | 463.2 × 615.6 | 5471 × 7271 |
| A2 poster | 420 × 594 | 426 × 600 | 5032 × 7087 |
| 24 × 36 in poster | 609.6 × 914.4 | 615.6 × 920.4 | 7271 × 10871 |
| A1 poster | 594 × 841 | 600 × 847 | 7087 × 10004 |
| A0 poster | 841 × 1,189 | 847 × 1,195 | 10004 × 14115 |
| Square 210 mm | 210 × 210 | 216 × 216 | 2552 × 2552 |
Tips and pitfalls
- Set bleed in the document, not by scaling. Enlarging a finished design to cover the bleed distorts it and pushes text towards the edge.
- Extend backgrounds, not content. Photos and colour blocks run into the bleed; text, logos and borders stay inside the safe area.
- Avoid thin borders near the edge. A frame close to the trim shows any cutting drift as an uneven border.
- Export with bleed and marks. Most printers want a PDF with the bleed included and crop marks; the crop mark generator makes a template.
FAQ
What size should my document be with bleed?
Add the bleed twice to each dimension. With 3 mm bleed, an A4 page becomes 216 × 303 mm and an A5 page 154 × 216 mm. With 0.125 in bleed, a US letter page becomes 8.75 × 11.25 in.
What is the difference between bleed and safe area?
Bleed is the extra artwork outside the trim line that gets cut off. The safe area is inside the trim line, a margin where important text and logos must stay so they are never clipped by a slightly off cut.
Is 3 mm bleed enough?
For flyers, leaflets, cards and most brochures, yes. Large-format posters, banners, and books with wrapped covers often need 5 mm or more. Always check the printer's own specification sheet first.
What resolution should print images be?
300 DPI at the final printed size is the standard for photos and artwork viewed up close. Posters seen from a distance can use 150 DPI, while line art and small text benefit from 600 DPI or vector files.
Do I need bleed if nothing touches the edge?
No. If the design has a white border all round and no colour reaches the trim line, bleed is not needed. Many printers still prefer the file set up with bleed so every job goes through the same workflow.
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