Paper and envelope sizes
Most of the world uses the A series; the United States and Canada use Letter. These pages give the exact sizes in both units and explain how to move between them.
In this section
- A series (A0 to A10)Dimensions of A0, A1, A2, A3, A4, A5 and the smaller A sizes in millimetres and inches, with the rule behind them and common mistakes.
- B series (ISO and JIS)Dimensions of B0 to B10 in millimetres and inches for both B series: the international ISO sizes and the larger Japanese JIS sizes.
- Envelope sizes and finderEnvelope sizes in mm and inches, C4, C5, C6 and DL and North American A2, A6, A7, A9 and #10, with a finder for the envelope that fits your card.
- US sizes (Letter, Legal)Dimensions of Letter, Legal, Tabloid, Half Letter, Executive, ANSI A to E and Arch A to E in inches and millimetres.
- A4 vs LetterA4 is 210 by 297 mm, Letter is 8.5 by 11 inches. See the difference in both units, where each is used and how to print one on the other.
- Paper sizes in pixelsA4, Letter and every ISO A, B and C size in pixels at 72, 96, 150, 300 or any DPI, and how large an image of a given pixel size prints.
- Photo print and frame sizesCommon photo print and frame sizes in inches and cm, which ones crop your photo and by how much, and how large a mat opening should be.
Which page do you need?
- For A4, A3, A5 and the other international sheets, open the A series chart.
- For notebooks and books labelled B5 or B6, open the B series chart and check whether the product follows the international or the Japanese series.
- For envelopes, open the C series chart. It also says which envelope holds which sheet.
- For Letter, Legal, Tabloid and drawing sheets, open the US chart.
- For printing a file on the other kind of paper, open A4 compared with Letter.
How these charts are made
International sizes are calculated from the rules of the standard and then compared with published tables. North American sizes are defined in inches and converted at exactly 25.4 mm per inch. Each page lists its sources and the date of the last check.