Paper Size Converter | Every paper size in every unit

Look up any paper size in millimetres, centimetres, inches and pixels at any DPI. A series, B series, C series envelopes, US Letter and Legal, plus photo sizes.


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Only affects the pixel dimensions. Use 96 for screens, 300 for print.
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Every standard paper size

Millimetres, centimetres, inches and pixels for each size. Click any row to open it above.

Size Millimetres Centimetres Inches Pixels
841 x 1189 84.1 x 118.9 33.11 x 46.81 9933 x 14043
594 x 841 59.4 x 84.1 23.39 x 33.11 7016 x 9933
420 x 594 42 x 59.4 16.54 x 23.39 4961 x 7016
297 x 420 29.7 x 42 11.69 x 16.54 3508 x 4961
210 x 297 21 x 29.7 8.27 x 11.69 2480 x 3508
148 x 210 14.8 x 21 5.83 x 8.27 1748 x 2480
105 x 148 10.5 x 14.8 4.13 x 5.83 1240 x 1748
74 x 105 7.4 x 10.5 2.91 x 4.13 874 x 1240
52 x 74 5.2 x 7.4 2.05 x 2.91 614 x 874
1000 x 1414 100 x 141.4 39.37 x 55.67 11811 x 16701
707 x 1000 70.7 x 100 27.83 x 39.37 8350 x 11811
500 x 707 50 x 70.7 19.69 x 27.83 5906 x 8350
353 x 500 35.3 x 50 13.9 x 19.69 4169 x 5906
250 x 353 25 x 35.3 9.84 x 13.9 2953 x 4169
176 x 250 17.6 x 25 6.93 x 9.84 2079 x 2953
125 x 176 12.5 x 17.6 4.92 x 6.93 1476 x 2079
229 x 324 22.9 x 32.4 9.02 x 12.76 2705 x 3827
162 x 229 16.2 x 22.9 6.38 x 9.02 1913 x 2705
114 x 162 11.4 x 16.2 4.49 x 6.38 1346 x 1913
110 x 220 11 x 22 4.33 x 8.66 1299 x 2598
216 x 279 21.6 x 27.9 8.5 x 10.98 2551 x 3295
216 x 356 21.6 x 35.6 8.5 x 14.02 2551 x 4205
279 x 432 27.9 x 43.2 10.98 x 17.01 3295 x 5102
432 x 279 43.2 x 27.9 17.01 x 10.98 5102 x 3295
184 x 267 18.4 x 26.7 7.24 x 10.51 2173 x 3154
140 x 216 14 x 21.6 5.51 x 8.5 1654 x 2551
127 x 203 12.7 x 20.3 5 x 7.99 1500 x 2398
85 x 55 8.5 x 5.5 3.35 x 2.17 1004 x 650
100 x 148 10 x 14.8 3.94 x 5.83 1181 x 1748
102 x 152 10.2 x 15.2 4.02 x 5.98 1205 x 1795
127 x 178 12.7 x 17.8 5 x 7.01 1500 x 2102
203 x 254 20.3 x 25.4 7.99 x 10 2398 x 3000

Why A4 is the size it is

The A series is built on one clever rule: every sheet has the same shape, and folding it in half gives the next size down. That only works if the ratio of the sides is the square root of two, roughly 1.414 to 1. A0 is defined as the sheet with that ratio and an area of exactly one square metre, and everything else follows. Fold A0 in half and you get A1, fold again for A2, and so on down to A4 at 210 by 297 mm.

What that rule buys you

Because the proportions never change, scaling between sizes is lossless in layout terms. Printing an A4 document onto A3 is exactly 141% and nothing gets cropped, which is why photocopiers have those percentages on the buttons. It also means paper weight in grams per square metre translates directly: an A4 sheet of 80 gsm paper weighs exactly 5 grams, because sixteen of them make a square metre.

Why the US uses different sizes

North America never adopted the ISO system and uses Letter (8.5 by 11 inches) and Legal (8.5 by 14 inches) instead. These come from traditional imperial paper making rather than a mathematical rule, so they do not share a common aspect ratio and do not halve neatly. Letter is slightly wider and shorter than A4, which is why documents laid out for one often need adjusting for the other.

Worth knowing

  • A4 is 210 by 297 mm, or 8.27 by 11.69 inches. US Letter is 216 by 279 mm, so it is 6 mm wider and 18 mm shorter.
  • The B series sits between the A sizes and is used for books and posters; the C series is sized to hold A sheets, which is why a C4 envelope takes an unfolded A4 letter.
  • Each step up doubles the area, and each step down halves it. A3 is twice A4, A5 is half of it.
  • For full-bleed printing, add at least 3 mm of bleed on every edge, so an A4 artwork becomes 216 by 303 mm.
  • At 300 DPI an A4 page is 2480 by 3508 pixels, which is the usual target for print-ready artwork.

Frequently asked questions

A4 is 8.27 by 11.69 inches, which is 210 by 297 millimetres or 21 by 29.7 centimetres. At 300 DPI that works out as 2480 by 3508 pixels, and at the screen standard of 96 DPI it is 794 by 1123 pixels.

US Legal is 8.5 by 14 inches, or 216 by 356 millimetres. It shares its width with US Letter but is three inches longer, which is why legal documents and contracts fit more text per page without changing the margins.

Neither is simply bigger. A4 is 210 by 297 mm and Letter is 216 by 279 mm, so Letter is about 6 mm wider while A4 is about 18 mm taller. A4 has slightly more area. Because they differ in both directions, a document laid out for one will usually need its margins adjusted for the other.

2480 by 3508 pixels. That comes from multiplying the size in inches, 8.27 by 11.69, by 300. If you are preparing print-ready artwork, that is the resolution to work at, and you should add 3 mm of bleed on each edge if the design runs to the paper edge.

Because the height is determined by the aspect ratio, not chosen for roundness. Every A size has sides in a ratio of one to the square root of two, so that halving the sheet produces the same proportions. Starting from A0 at one square metre, that rule forces A4 to be 210 by 297 mm.

All three use the same square-root-of-two proportions but start from different base sizes. A is the everyday document series. B sits between consecutive A sizes and is used for books, posters and passports. C is sized to hold A sheets, so a C4 envelope takes an unfolded A4 sheet and a C5 takes an A4 folded once.

A3 is exactly twice the area of A4. It measures 297 by 420 mm, which is A4 rotated and doubled along one side. That is why enlarging A4 to A3 on a photocopier is 141%, and reducing A3 to A4 is 71%.

Bleed is extra artwork extending past the trim line so that tiny cutting inaccuracies do not leave white slivers at the edge. The usual requirement is 3 mm on all four sides, so an A4 design is supplied at 216 by 303 mm. Keep important text at least 5 mm inside the trim line as well.

What size is A4 paper?

A4 is 210 by 297 mm, which is 8.27 by 11.69 inches or 21 by 29.7 cm. At print resolution of 300 DPI that is 2480 by 3508 pixels. Every A size keeps the same proportions, so folding one in half gives the next size down.