Paper Sizes Explained

Standard Paper Sizes Explained

The purpose of this post is to explain the common paper sizes used inpopular writing and print applications.

The most used of course, is the A Series Paper size. However, there are many other international paper sizes and formats, and these include:


  • A Series (A10 – 4A0)
  • B Series (B8 – B0)
  • C Series (Envelope Sizes)
  • Architectural
  • US Sizes (Letter, Legal and Ledger)
  • Newspaper
  • Postcard
  • RA & SRA

    In this post, I will be covering only A and B sizes, as that is what we commonly use in South Africa and at Essential DigiHub.

    The dimensions of these 2 paper sizes are covered by the ISO 216 Standard, and is based on one size being half the size of the previous one (A5 is half of an A4. A4 is half of an A3, and so on). This system allows for a variety of useful applications, such as the enlarging and reducing of images without any cutoff or margins, or folding to make a booklet of the next size down.

    A Series Paper Sizes

    The following A Series Sizes are covered by the ISO 216 – A0, A1, A2, A3, A4, A5, A6, A7 and A8.
    Also available though, are the over-sized 2A0 and 4A0 as well as the under-sized A9 and A10, but these are not covered by the ISO 216 standard.


    Table of  A Series Paper Sizes

    SizeWidth x Height (mm)Width x Height (in)
    4A01682 x 2378 mm66.2 x 93.6 in
    2A01189 x 1682 mm46.8 x 66.2 in
    A0841 x 1189 mm33.1 x 46.8 in
    A1594 x 841 mm23.4 x 33.1 in
    A2420 x 594 mm16.5 x 23.4 in
    A3297 x 420 mm11.7 x 16.5 in
    A4210 x 297 mm8.3 x 11.7 in
    A5148 x 210 mm5.8 x 8.3 in
    A6105 x 148 mm 4.1 x 5.8 in
    A774 x 105 mm2.9 x 4.1 in
    A852 x 74 mm2.0 x 2.9 in
    A937 x 52 mm1.5 x 2.0 in
    A1026 x 37 mm1.0 x 1.5 in


    B Series Paper Sizes

    The B Series is very similar to the A Series, and is also covered by the ISO 216 Standard. The B Series seizes were created to provide for sizes that aren’t covered by the A Series.

    It is the same as the A Series with respect to their aspect ratios. Sizes covered in the B Series are B8, B7, B6, B5, B4, B3, B2, B1 and B0
    The B Series also offers 2 under-sized sizes that are not covered by ISO 216 – B9 and B10


    Table of B Series Sizes

    SizeWidth x Height (mm)Width x Height (in)
    B01000 x 1414 mm39.4 x 55.7 in
    B1707 x 1000 mm27.8 x 39.4 in
    B2500 x 707 mm19.7 x 27.8 in
    B3353 x 500 mm13.9 x 19.7 in
    B4250 x 353 mm9.8 x 13.9 in
    B5176 x 250 mm6.9 x 9.8 in
    B6125 x 176 mm4.9 x 6.9 in
    B788 x 125 mm 3.5 x 4.9 in
    B862 x 88 mm62 x 88 mm
    B944 x 62 mm1.7 x 2.4 in
    B1031 x 44 mm 1.2 x 1.7 in


    Other Paper Sizes Briefly explained


    C Series Sizes

    The C Series sizes are also covered by the ISO 216 Standard, but they used for envelope sizes.

    The C Series ranges from C0 – C10 and is directly relative to the A Series Sizes. a C4 envelope can fit an A4 perfectly, same as an A5 in a C5 envelope, and so on.

    US Sizes

    US Sizes are only used in North Ameria, and is not covered by the ISO 216 Standard. These sizes are more commonly know as Letter, Legal, Executive or Ledger.

    RA and SRA (Untrimmed)

    RA and SRA are untrimmed Paper Sizes, relative to the A Series Paper Sizes. RA stands for “Raw format A” and SRA for “Supplementary Raw format A”.

    RA is 105% of the A Series Size, and SRA is 115% of the A Series Size.

    These Untrimmed Sizes are not covered by the ISO 216 Standard, but the ISO 217 Standard – Which covers untrimmed raw paper for commercial printing.


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