Unit Converters

Paper Size Reference

Every standard paper size in mm, cm, inches and pixels — at whatever DPI you are printing.

DPI

Landscape

Size	mm	cm	inches	px @ 300
4A0 Oversized posters	1682 × 2378	168.2 × 237.8	66.22 × 93.62	19866 × 28087
2A0	1189 × 1682	118.9 × 168.2	46.81 × 66.22	14043 × 19866
A0 Exactly one square metre	841 × 1189	84.1 × 118.9	33.11 × 46.81	9933 × 14043
A1 Large posters, technical drawings	594 × 841	59.4 × 84.1	23.39 × 33.11	7016 × 9933
A2 Posters, wall charts	420 × 594	42 × 59.4	16.54 × 23.39	4961 × 7016
A3 Drawings, diagrams, small posters	297 × 420	29.7 × 42	11.69 × 16.54	3508 × 4961
A4 The global standard document size	210 × 297	21 × 29.7	8.27 × 11.69	2480 × 3508
A5 Notebooks, flyers	148 × 210	14.8 × 21	5.83 × 8.27	1748 × 2480
A6 Postcards	105 × 148	10.5 × 14.8	4.13 × 5.83	1240 × 1748
A7	74 × 105	7.4 × 10.5	2.91 × 4.13	874 × 1240
A8 Business cards in some regions	52 × 74	5.2 × 7.4	2.05 × 2.91	614 × 874
A9	37 × 52	3.7 × 5.2	1.46 × 2.05	437 × 614
A10	26 × 37	2.6 × 3.7	1.02 × 1.46	307 × 437
B0	1000 × 1414	100 × 141.4	39.37 × 55.67	11811 × 16701
B1 Posters	707 × 1000	70.7 × 100	27.83 × 39.37	8350 × 11811
B2	500 × 707	50 × 70.7	19.69 × 27.83	5906 × 8350
B3	353 × 500	35.3 × 50	13.90 × 19.69	4169 × 5906
B4	250 × 353	25 × 35.3	9.84 × 13.90	2953 × 4169
B5 Books	176 × 250	17.6 × 25	6.93 × 9.84	2079 × 2953
B6	125 × 176	12.5 × 17.6	4.92 × 6.93	1476 × 2079
B7 Passports	88 × 125	8.8 × 12.5	3.46 × 4.92	1039 × 1476
B8	62 × 88	6.2 × 8.8	2.44 × 3.46	732 × 1039
C4 Envelope for unfolded A4	229 × 324	22.9 × 32.4	9.02 × 12.76	2705 × 3827
C5 Envelope for A4 folded once	162 × 229	16.2 × 22.9	6.38 × 9.02	1913 × 2705
C6 Envelope for A4 folded twice	114 × 162	11.4 × 16.2	4.49 × 6.38	1346 × 1913
C6/C5 (DL) Standard business envelope	110 × 220	11 × 22	4.33 × 8.66	1299 × 2598
C3	324 × 458	32.4 × 45.8	12.76 × 18.03	3827 × 5409
C7	81 × 114	8.1 × 11.4	3.19 × 4.49	957 × 1346
Letter US standard, 8.5 x 11 in	215.9 × 279.4	21.59 × 27.94	8.50 × 11.00	2550 × 3300
Legal 8.5 x 14 in	215.9 × 355.6	21.59 × 35.56	8.50 × 14.00	2550 × 4200
Tabloid 11 x 17 in	279.4 × 431.8	27.94 × 43.18	11.00 × 17.00	3300 × 5100
Ledger Tabloid, landscape	431.8 × 279.4	43.18 × 27.94	17.00 × 11.00	5100 × 3300
Executive 7.25 x 10.5 in	184.1 × 266.7	18.41 × 26.67	7.25 × 10.50	2174 × 3150
Half Letter 5.5 x 8.5 in	139.7 × 215.9	13.97 × 21.59	5.50 × 8.50	1650 × 2550
Junior Legal 5 x 8 in	127 × 203.2	12.7 × 20.32	5.00 × 8.00	1500 × 2400
ANSI C 17 x 22 in	431.8 × 558.8	43.18 × 55.88	17.00 × 22.00	5100 × 6600
2R Wallet photo	63.5 × 89	6.35 × 8.9	2.50 × 3.50	750 × 1051
4R / 6x4 The most common print size	102 × 152	10.2 × 15.2	4.02 × 5.98	1205 × 1795
5R / 7x5	127 × 178	12.7 × 17.8	5.00 × 7.01	1500 × 2102
6R / 8x6	152 × 203	15.2 × 20.3	5.98 × 7.99	1795 × 2398
8R / 10x8	203 × 254	20.3 × 25.4	7.99 × 10.00	2398 × 3000
S8R / 12x8	203 × 305	20.3 × 30.5	7.99 × 12.01	2398 × 3602
Passport Most countries	35 × 45	3.5 × 4.5	1.38 × 1.77	413 × 531
US Passport 2 x 2 in	50.8 × 50.8	5.08 × 5.08	2.00 × 2.00	600 × 600

How to Use

1. Pick a series tab, or search for a size by name.
2. Choose the DPI you are printing or exporting at.
3. Switch to landscape if you need the rotated dimensions.
4. Copy the measurement you need in mm, cm, inches or pixels.

How Paper Sizes Actually Work

The ISO 216 A series is built on a single idea: every sheet has an aspect ratio of the square root of two, roughly 1.414:1. That is the only ratio that survives being folded in half, which is why an A4 sheet folded across its long edge gives exactly A5, and why scaling a design between sizes never crops or leaves a mismatched margin. A0 is defined as the sheet of that ratio with an area of exactly one square metre, and every other size halves down from there.

Pixels are the part people get wrong. A paper size is a physical measurement, so it has no pixel dimensions until you fix a resolution. A4 is 2480 × 3508 px at 300 DPI, 1240 × 1754 at 150, and 794 × 1123 at the 96 DPI browsers assume — all the same sheet of paper. Any pixel figure quoted without a DPI is incomplete.

North America is the notable exception to ISO 216. US Letter is slightly wider and noticeably shorter than A4, and the two are close enough that a document formatted for one prints on the other without an obvious error — it just quietly clips the footer or spills onto an extra page.

Frequently Asked Questions

What size is A4 in pixels?

It depends entirely on the resolution. A4 is 210 x 297 mm, which is 2480 x 3508 pixels at 300 DPI for print, 1240 x 1754 at 150 DPI, and 794 x 1123 at the 96 DPI browsers assume. Always state the DPI alongside a pixel size.

Why does halving an A4 sheet give exactly A5?

Because every ISO 216 size has an aspect ratio of the square root of 2, about 1.414:1. That is the only ratio preserved when you fold a sheet in half, which is what makes the A series scale cleanly with no cropping and no wasted margin.

What is the difference between A4 and US Letter?

A4 is 210 x 297 mm; Letter is 216 x 279 mm. Letter is about 6 mm wider and 18 mm shorter, so a document laid out for one will not print correctly on the other without scaling — the usual symptom is a clipped footer or an unexpected extra page.

Which DPI should I use?

Use 300 DPI for anything commercially printed, 150 DPI for draft or home printing, and 72 or 96 DPI for screens. Going above 300 rarely improves a print and multiplies the file size.

What are the C sizes for?

Envelopes. A C size is sized to hold the matching A size: an A4 sheet fits flat in a C4 envelope, folded once in a C5, and folded twice in a C6. DL is the long business envelope that takes an A4 sheet folded into three.

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