Paper Size Reference & Pixel Calculator
Browse ISO 216 A/B/C, US (Letter, Legal, ANSI), Japanese JIS-B, photo and envelope paper sizes in mm, inches and pixels at any DPI.
| Name | Width (mm) | Height (mm) | Width (in) | Height (in) | Pixels @ DPI | Aspect |
|---|---|---|---|---|---|---|
| A0 | 841 | 1,189 | 33.11 | 46.811 | 9933 × 14043 | 1:1.414 |
| A1 | 594 | 841 | 23.386 | 33.11 | 7016 × 9933 | 1:1.416 |
| A2 | 420 | 594 | 16.535 | 23.386 | 4961 × 7016 | 1:1.414 |
| A3 | 297 | 420 | 11.693 | 16.535 | 3508 × 4961 | 1:1.414 |
| A4 | 210 | 297 | 8.268 | 11.693 | 2480 × 3508 | 1:1.414 |
| A5 | 148 | 210 | 5.827 | 8.268 | 1748 × 2480 | 1:1.419 |
| A6 | 105 | 148 | 4.134 | 5.827 | 1240 × 1748 | 1:1.41 |
| A7 | 74 | 105 | 2.913 | 4.134 | 874 × 1240 | 1:1.419 |
| A8 | 52 | 74 | 2.047 | 2.913 | 614 × 874 | 1:1.423 |
| A9 | 37 | 52 | 1.457 | 2.047 | 437 × 614 | 1:1.405 |
| A10 | 26 | 37 | 1.024 | 1.457 | 307 × 437 | 1:1.423 |
Compare two sizes
Letter: 215.9 × 279.4 mm
All sizes are based on published international standards (ISO 216, ANSI Y14.1, JIS P 0138). Pixel = mm × DPI / 25.4.
CopyHow to use
- Pick a paper standard (ISO A, ISO B, ISO C, US, JIS-B, Photo, Envelope) to see its sizes in the table.
- Set the DPI for pixel dimensions — 72 (web), 96 (Windows screen), 150 (draft print), 300 (standard print), 600 (high-quality print) or any custom value.
- Click any width, height or pixel cell to copy its value.
- Use the compare panel to overlay two sizes (e.g. A4 vs Letter) and see the exact scale factors and area difference.
About this tool
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A complete reference for paper sizes used in printing, design and document setup. Lists every ISO 216 A, B and C size (A0–A10, B0–B10, C0–C8), all common North American sizes (Letter, Legal, Junior Legal, Tabloid, Ledger, Executive, Government, ANSI A–E), Japanese JIS-B series, photo print sizes (2R–24×36″) and standard envelopes (DL, C5, C6, #10, Monarch, Chou/Kaku). For each size you get the width × height in millimeters, inches and pixels at your chosen DPI (72/96/150/300/600 or custom), plus aspect ratio. The compare panel renders any two sizes overlaid at correct relative scale with a width/height/area ratio breakdown — great for picking print sizes, designing for fixed paper, or estimating image dimensions for a target resolution.
Frequently asked questions
Why is the ISO A/B/C aspect ratio always 1:1.414?
1.414 is √2. ISO 216 was designed so cutting a sheet in half along its long edge produces two sheets with the exact same aspect ratio — that's the only ratio where this works. A0 has a nominal area of 1 m²; each step halves the area.
Are pixel dimensions exact?
Pixels = mm × DPI / 25.4, rounded to the nearest integer. So A4 at 300 DPI is 2480 × 3508 px (the standard 'print-ready A4' size in Photoshop). The mm and inch values themselves come from the published standards.
What's the difference between Letter and ANSI A?
They're the same physical size (8.5 × 11″ = 215.9 × 279.4 mm). 'Letter' is the everyday name; 'ANSI A' is the same sheet as part of the ANSI engineering series (A, B, C, D, E) that doubles like ISO.
What DPI should I use?
72 for legacy web/PDF, 96 for Windows screen, 150 for draft print or large posters viewed from a distance, 300 for standard print (books, magazines, photos), 600+ for fine art or small detail. Most photo labs assume 300 DPI.
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