Paper sizes for printing explained | Whilst the best known size paper is A4 and most people use it every day – there are many paper format sizes. Here is the quick low down of the measurements and how it works.

How are paper sizes for printing determined?

Paper sizes for printing are determined using the measurement by halving or doubling the dimensions of preceding or succeeding sheet size.

Taking the most common A4 sheet (297mm x 210) – the next larger paper size is A3 (297mm x 420mm) or the next smaller paper size is A5 (210mm x 148.5)

The sizes change by either halving or doubling the length or width dimensions in order to keep the paper size formats in a uniform shape.

The international paper standard for measuring paper sizes is ISO 216 expect in USA and Canada that have their own sizes. ISO 216 defines the standard for A, B and C ranges of paper sizes, a full range of measurements are below.

Lithographic & Digital Printers print on larger formats of paper enabling them to print multiple pages of brochures and magazines at once or for printing multiple leaflets and flyers etc.

A Sized Paper – For finished sizes and large format printing.

A0 is the largest size and is the equivalent of one square meter. By folding an A0 sheet in half this will become A1. Fold in half again this will become A2. This continues through to the smallest available sizes.

A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10

A series paper sizes for printing

B Sized Paper – For book publications and posters.

Commercial printing press measurements use these sizes to define the largest printable sheet. These are also a popular size by some for books and posters, giving customers a wider choice of size formats for their printing needs.

B1, B1, B2, B3, B4, B5, B6, B7, B8, B9, B10

C Sized Paper – For envelope sizes

Envelopes are produced in C sizes and designed to easily accommodate the most common A sized paper products. An A4 sheet of paper will fit neatly into a C4 envelope. An A5 sheet will fit into a C5 envelope and so on.

Untrimmed RA & SRA sizes

RA sized paper – Defined as Raw Format ‘A’

Specifies the untrimmed sizes used in commercial printing and are slightly larger than the corresponding A sized paper ranges.

SRA size paper – Supplementary Raw format ‘A’

SRA is a larger untrimmed size used in commercial printing. This allows additional room for the ink bleed to the edge of the paper, before being trimmed to match the finished A sized paper required.

Commercial Paper sizes for printing

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