Paper Size Chart — A, B, C, US Letter and Pixels
A reference for every paper size: the ISO A, B and C series and the US sizes, in millimetres, inches and pixels — at the DPI you choose.
A4 is 210 × 297 mm · 2480 × 3508 px at 300 DPI.
| Size | Series | Millimetres | Inches | Pixels at 300 DPI | Area (mm²) |
|---|---|---|---|---|---|
| 4A0 | A | 1682 × 2378 mm | 66.22 × 93.62 in | 19866 × 28087 px | 3,999,796 |
| 2A0 | A | 1189 × 1682 mm | 46.81 × 66.22 in | 14043 × 19866 px | 1,999,898 |
| A0 | A | 841 × 1189 mm | 33.11 × 46.81 in | 9933 × 14043 px | 999,949 |
| A1 | A | 594 × 841 mm | 23.39 × 33.11 in | 7016 × 9933 px | 499,554 |
| A2 | A | 420 × 594 mm | 16.54 × 23.39 in | 4961 × 7016 px | 249,480 |
| A3 | A | 297 × 420 mm | 11.69 × 16.54 in | 3508 × 4961 px | 124,740 |
| A4 | A | 210 × 297 mm | 8.27 × 11.69 in | 2480 × 3508 px | 62,370 |
| A5 | A | 148 × 210 mm | 5.83 × 8.27 in | 1748 × 2480 px | 31,080 |
| A6 | A | 105 × 148 mm | 4.13 × 5.83 in | 1240 × 1748 px | 15,540 |
| A7 | A | 74 × 105 mm | 2.91 × 4.13 in | 874 × 1240 px | 7,770 |
| A8 | A | 52 × 74 mm | 2.05 × 2.91 in | 614 × 874 px | 3,848 |
| A9 | A | 37 × 52 mm | 1.46 × 2.05 in | 437 × 614 px | 1,924 |
| A10 | A | 26 × 37 mm | 1.02 × 1.46 in | 307 × 437 px | 962 |
| B0 | B | 1000 × 1414 mm | 39.37 × 55.67 in | 11811 × 16701 px | 1,414,000 |
| B1 | B | 707 × 1000 mm | 27.83 × 39.37 in | 8350 × 11811 px | 707,000 |
| B2 | B | 500 × 707 mm | 19.69 × 27.83 in | 5906 × 8350 px | 353,500 |
| B3 | B | 353 × 500 mm | 13.9 × 19.69 in | 4169 × 5906 px | 176,500 |
| B4 | B | 250 × 353 mm | 9.84 × 13.9 in | 2953 × 4169 px | 88,250 |
| B5 | B | 176 × 250 mm | 6.93 × 9.84 in | 2079 × 2953 px | 44,000 |
| B6 | B | 125 × 176 mm | 4.92 × 6.93 in | 1476 × 2079 px | 22,000 |
| B7 | B | 88 × 125 mm | 3.46 × 4.92 in | 1039 × 1476 px | 11,000 |
| B8 | B | 62 × 88 mm | 2.44 × 3.46 in | 732 × 1039 px | 5,456 |
| B9 | B | 44 × 62 mm | 1.73 × 2.44 in | 520 × 732 px | 2,728 |
| B10 | B | 31 × 44 mm | 1.22 × 1.73 in | 366 × 520 px | 1,364 |
| C0 | C | 917 × 1297 mm | 36.1 × 51.06 in | 10831 × 15319 px | 1,189,349 |
| C1 | C | 648 × 917 mm | 25.51 × 36.1 in | 7654 × 10831 px | 594,216 |
| C2 | C | 458 × 648 mm | 18.03 × 25.51 in | 5409 × 7654 px | 296,784 |
| C3 | C | 324 × 458 mm | 12.76 × 18.03 in | 3827 × 5409 px | 148,392 |
| C4 | C | 229 × 324 mm | 9.02 × 12.76 in | 2705 × 3827 px | 74,196 |
| C5 | C | 162 × 229 mm | 6.38 × 9.02 in | 1913 × 2705 px | 37,098 |
| C6 | C | 114 × 162 mm | 4.49 × 6.38 in | 1346 × 1913 px | 18,468 |
| C7 | C | 81 × 114 mm | 3.19 × 4.49 in | 957 × 1346 px | 9,234 |
| C8 | C | 57 × 81 mm | 2.24 × 3.19 in | 673 × 957 px | 4,617 |
| C9 | C | 40 × 57 mm | 1.57 × 2.24 in | 472 × 673 px | 2,280 |
| C10 | C | 28 × 40 mm | 1.1 × 1.57 in | 331 × 472 px | 1,120 |
| Letter (ANSI A) | US | 215.9 × 279.4 mm | 8.5 × 11 in | 2550 × 3300 px | 60,322 |
| Legal | US | 215.9 × 355.6 mm | 8.5 × 14 in | 2550 × 4200 px | 76,774 |
| Tabloid (Ledger (landscape)) | US | 279.4 × 431.8 mm | 11 × 17 in | 3300 × 5100 px | 120,645 |
| Junior Legal | US | 127 × 203.2 mm | 5 × 8 in | 1500 × 2400 px | 25,806 |
| Half Letter (Statement) | US | 139.7 × 215.9 mm | 5.5 × 8.5 in | 1650 × 2550 px | 30,161 |
| Executive | US | 184.15 × 266.7 mm | 7.25 × 10.5 in | 2175 × 3150 px | 49,113 |
| Government Letter | US | 203.2 × 266.7 mm | 8 × 10.5 in | 2400 × 3150 px | 54,193 |
| 4×6 in | photo | 101.6 × 152.4 mm | 4 × 6 in | 1200 × 1800 px | 15,484 |
| 5×7 in | photo | 127 × 177.8 mm | 5 × 7 in | 1500 × 2100 px | 22,581 |
| 8×10 in | photo | 203.2 × 254 mm | 8 × 10 in | 2400 × 3000 px | 51,613 |
What this tool does
It is a reference for paper sizes, with the conversions that matter in practice: millimetres, the inches most design software wants, and the pixel dimensions at whatever DPI you are exporting. Type a size you have — 200 × 280 mm from a printer's quote, say — and it finds the standard size closest to it, which is often all you need to know which stock to order.
The A series, and why the numbers look odd
Every A size is the one above it folded in half across the long edge, and the ratio is √2 — the one shape that survives that halving unchanged. A0 is defined as exactly one square metre; A1 is half of it, A2 half of that, down to A10. The practical payoff is that a document laid out at A4 scales cleanly to A3 or A5 with the same proportions, no letterboxing and no reflow, which is why the series is used for printing everywhere except North America.
The B and C series
B sizes are defined the same way but start from B0, sized so the geometric mean falls between two A sizes — which is why B5 is larger than A5 and smaller than A4. They are the sizes for posters, books and artwork. C sizes exist only for envelopes, and are defined so a matching A sheet fits inside: A4 goes into a C4 envelope, A5 into a C5, A6 into a C6, the paper nested with a little room around it.
US sizes and the A4 question
North America kept the older sizes: Letter, Legal, Tabloid and Ledger, inherited from traditional papermaking rather than derived from a ratio. They are not simple multiples of one another and do not share the √2 shape, so converting a layout between Letter and A4 is a genuine re-layout, not a scale. Letter and Legal are the same width with different lengths; Tabloid is Letter doubled, and Ledger is Tabloid turned landscape. When a document has to print on both sides of the Atlantic, the margins are what give — hence the convention of leaving generous margins on Letter-oriented designs.
Millimetres, inches and pixels
Millimetres are the defining unit for the ISO sizes and inches for the US ones, so the tool keeps both and converts exactly — the inch is defined as 25.4 mm, so the conversion is a multiplication, not an approximation. Pixels then depend on the output device: multiply the inches by the DPI. For a print-ready image 300 DPI is the standard, 150 is a proof, and a screen is around 72 to 96. The chart below updates with the value you type, so you can read off the canvas size an export needs.
Common sizes at a glance
| Size | Millimetres | Inches | Pixels at 300 DPI |
|---|---|---|---|
| A3 | 297 × 420 mm | 11.69 × 16.54 in | 3508 × 4961 px |
| A4 | 210 × 297 mm | 8.27 × 11.69 in | 2480 × 3508 px |
| A5 | 148 × 210 mm | 5.83 × 8.27 in | 1748 × 2480 px |
| Letter | 215.9 × 279.4 mm | 8.5 × 11 in | 2550 × 3300 px |
| Legal | 215.9 × 355.6 mm | 8.5 × 14 in | 2550 × 4200 px |
| Tabloid | 279.4 × 431.8 mm | 11 × 17 in | 3300 × 5100 px |
Frequently asked questions
What is the difference between A4 and US Letter?
A4 is 210 × 297 mm and US Letter is 8.5 × 11 in (216 × 279 mm). They are close but not interchangeable: Letter is a little wider and a little shorter, so a document laid out for one will not fit the other without reflowing. That is why a PDF made for Letter prints with clipped margins on A4 paper, and vice versa.
Why is A4 that particular size?
Because the whole A series is built from one rule: every size is the previous one folded in half, and the aspect ratio is always √2 (about 1.414). The series starts at A0, defined as exactly one square metre, and each halving gives A1, A2 and so on down. Any size can be printed at any other by scaling, since the shapes are identical.
What are B and C sizes for?
B sizes sit between the A sizes and are used for posters, books and artwork where you want a size larger than the matching A. C sizes are for envelopes: a C4 envelope holds an unfolded A4 sheet, C5 holds A5, C6 holds A6. That nesting is deliberate — the C series is defined so the matching A size fits inside.
How many pixels is A4 at 300 DPI?
2480 × 3508. The arithmetic is the physical size in inches multiplied by the DPI: A4 is 8.27 × 11.69 in, and 8.27 × 300 = 2480. Use 300 DPI for print-quality images, 150 for a draft, 72 or 96 for screen. The table here shows the pixel dimensions at the DPI you choose, so you can set up a canvas or an image export correctly.
What does “fit to page” do to the margins?
Scaling a document does not scale the printable margin — a printer has an unprintable border of a few millimetres, so a borderless A4 design will be cropped or shrunk to fit. Leave at least 5 mm of margin inside the paper edge for a home printer, and more for edge-to-edge designs on a service that trims.
Is this tool a converter?
No — it is a reference and a calculator. It lists the sizes, converts between millimetres, inches and pixels at the DPI you choose, and finds the size nearest an arbitrary dimension. Nothing is uploaded and no file is produced.
Go deeper
Longer explanations of the problems this tool solves:
Sources
- ISO 216 — Writing paper and certain classes of printed matter: trimmed sizes, A and B series.
- ISO 269 — Correspondence envelopes: the C series.
- ANSI/ASME Y14.1 — the North-American paper size designations.
Everything runs in your browser — nothing you type is uploaded.