Common UK Paper Sizes


You can actually have any size you want within reason however the print industry generally uses the ISO standard for paper sizes.

The Different Paper Series

The ‘A’ series which includes A4 (the standard size for a letterhead) is the most commonly known and widely used ISO standard. As the ‘A’ number goes down the sheet size goes up with measurements given in millimetres.

A Series

A7 – 74 x 105mm
A6 – 148 x 105mm
A5 – 148 x 210mm
A4 – 297 x 210mm
A3 – 297 x 420mm
A2 – 594 x 420mm
A1 – 594 x 841mm
A0 – 1189 x 841mm

What makes this system so useful is that all the paper sizes have the same proportions; with the longest side being half the length of the shortest side on the next size of paper down. This has 2 benefits; the first is that if you fold or cut a sheet of A3 in half you will get a finished size of A4.

The second property is that the paper sizes have the same aspect ratio which is particularly useful when increasing or reducing artwork. For example you can use the same artwork for an A5 flyer and an A4 poster (provided the image resolution is OK when increased in size), saving you time reproducing the same piece of artwork for two different jobs.

Using the ‘A’ series also enables you to maximise your print budget and reduce waste as you will use the paper as economically as possible. If your job is larger than A4 (210mm x 297mm) but not as large as A3 (297mm x 420mm), for example 297mm X 297mm we still have to use an A3 sheet of paper and the part not used is cut off and sent for recycling.

Dispensers and display frames for leaflets, brochures and posters also use these standard sizes. Your printed item will therefore look smart and sit neatly if you decide to use it in a display in your office or at an exhibition. If you send your printing to a third party to display you also have more chance of it fitting their system too.
Finally envelopes use a measuring system that dovetails with these paper sizes so again, you will ensure that once printed it can be sent in the post easily and economically.

Needless to say there are always exceptions to the rule in some industries particularly and we therefore print all shapes and sizes to meet your bespoke printing requirements so give us a call if you need help.

SRA Series

The SRA Series is the ISO paper size standard that is used by printers to produce the finished A Series of paper sizes.

SRA0 – 900 x 1280 mm
SRA1 – 640 x 900 mm
SRA2 – 450 x 640 mm
SRA3 – 320 x 450 mm
SRA4 – 225 x 320 mm

If you need a finished job of A3, a printer uses a sheet size of SRA3 or alternatively an SRA2 sheet, out of which he would get 2 A3’s.

This slightly larger paper size allows room for any bleed on the job as well as colour bars that printers use to ensure that the finished printed sheets are the correct colour. This slightly larger sheet size also allows for an edge that the print press can grip onto as the sheets of paper pass through the press. It is very unlikely that you will need to know these paper sizes unless you are involved on the printing side of the industry.

R Series

The RA Series is another ISO paper size, again designed to produce the finished sheet sizes of the A Series but for jobs that do not have any bleed on them. It was predominately used for printing single colour stationery without bleed but today his series is not widely used.

RA0 – 860 × 1220
RA1 – 610 × 860
RA2 – 430 × 610
RA3 – 305 × 430
RA4 – 215 × 305

B Series

The B Series is another ISO standard for paper sizes that are used by printers to print jobs that do not fit standard SRA size. The most common use of this paper size is for folders with pockets that do not economically fit onto an SRA sheet size. The B series is used in specific industries that require slightly larger finished jobs. Music, media, bespoke luxury products.

B0 – 1000 x 1400mm
B1 – 700 x 1000mm
B2 – 500 x 700mm
B3 – 350 x 500mm
B4 – 250 x 350mm
B5 – 175 x 250mm
B6 – 125 x 175mm


There are still some industries and market sectors that use the old Imperial system for paper sizes. These sizes are measured in inches and have their own unique names and less obvious relationships between each other. We have listed the most popular sizes below.

Executive 71⁄4" x 101⁄2"
Quarto 8" x 10"
Letter 81⁄2" x 11"
Legal 81⁄2" x 14"
Ledger (Tabloid) 11" x 17"
Foolscap 131⁄2" x 17"
Foolscap (oblong double) 131⁄2" x 34"
Pinched Post 141⁄2" x 181⁄2"
Crown 15" x 20"
Post 151⁄4" x 19"
Large Post 161⁄2" x 21"
Double Foolscap 17" x 27"
Demy 171⁄2" x 221⁄2"
Medium 18" x 23"
Double Post 191⁄2" x 301⁄2"
Royal 20" x 25"
Double Crown 20" x 30" (Theatre Industry)
Super Royal 201⁄2" x 271⁄2"
Double Large Post 21" x 33"
Imperial 22" x 30"
Double Demy 221⁄2" x 35"
Elephant 23" x 28"
Double Medium 23" x 36"
Double Royal 25" x 40" (London Underground & British Rail)
Atlas 26" x 34"
Quad Foolscap 27" x 34"
Quad Crown 30" x 40" (Cinema Industry)
Double Imperial 30" x 44"
Quad Demy 35" x 45"
Quad Medium 36" x 46"
Double Quad Crown 40" x 60"

Whilst it might be interesting to know about these sizes, unless you are involved in industries that use them, it is unlikely that you will ever need them. The exception to this is the Letter size (8 1/2" x 11") which is used in North America as their standard size and comparable to our A4. It is the default on nearly all document producing software such as Microsoft Word. Unless changed in the ‘Page’ settings, using this size to produce your documents will result in a wider shorter image area.
Another system used for Large Format paper sizes, again using imperial measurements, is used by the advertising industry for large billboards.

Billboard Sizes
4 sheet 40" x 60"
6 sheet 1200mm x 1800mm
12 sheet (3 x 4 sheet) 60" x 120"
16 sheet (4 x 4 sheet) 80" x 120"
32 sheet (8 x 4 sheet) 120" x 160"
48 sheet (12 x 4 sheet) 120" x 240"
64 sheet (16 x 4 sheet) 120" x 320"
96 sheet (24 x 4 sheet) 120" x 480"