Size Guide

Our frame sizes always relate to the internal dimensions, meaning that if you order an A4 size frame for example, this will hold an A4 size poster/insert. The external size will be slightly larger and the visible size smaller. As a rule of thumb the visible area of your poster/insert will be approximately 10mm smaller around all four edges, and this can vary depending on the profile (width) of the frame.

Metric Sizes
Metric Name
Size in mm
Size in Inches


841 x 1188

33"1/8 x 46"3/4


594 x 841

23"3/8 x 33"1/8


420 x 594

16"1/2 x 23"3/8


297 x 420

11"3/4 x 16"1/2


210 x 297

8"1/4 x 11"3/4


148 x 210

5"7/8 x 8"1/4


105 x 148

4"1/8 x 5"7/8


52 x 74

2"7/8 x 8"1/4


148 x 210

2"1/8 x 2"7/8

1/3A4 (DL)

99 x 210

3"7/8 x 8"1/4


74 x 210

2"7/8 x 8"1/4

Imperial Sizes
Inch Size
Size in mm
Paper Name

20" x 30"

508 x 762

Double Crown

30" x 40"

762 x 1016

Quad or Quad Crown

25" x 40"

635 x 1016

Double Royal

40" x 60"

1016 x 1524

4 Sheet or Double Quad

1200 x 1800

6 Sheet or Six Sheet

B Series Sizes
Size in mm
Size in Inches


500 x 700

19"3/5 x 27"1/2


700 x 1000

27"1/2 x 39"1/3


1000 x 1400

39"1/3 x 55"1/8

US Paper Sizes:
As with other UK suppliers, Red17 do not stock frames to suit the standard North American paper sizes. Sizes are: Letter size: 8 1/2in x 11in (216 x 279mm) Similar to A4 (but wider and shorter) / Legal size: 8 1/2in x 14in (216 x 356mm) Tabloid: 11in x 17in (279 x 432mm) - Similar to A3 (but narrower and taller) Ledger is the landscape version of Tabloid.

Metric paper sizes are known as International Standard (ISO 216) or DIN (German Standard) paper sizes. They are used in most of the countries in the world - the most important exception being North America. In United Kingdom a few 'inch' sizes are used alongside metric sizes. However US 'letter' and 'legal'sizes are never used - they are universally replaced by A4 size.

Every 'A' size is double the previous size: Remember that A8 is very small (about 2in x 3in) and A0 is big (nearly 3ft x 4ft).

To calculate in cm use mm above and move the decimal point one space to the left: Eg. 210mm is 21cm. All poster frame sizes are defined by the paper insert size. The external frame size is always slightly larger. The visible area is slightly less than the paper size. Do not print critical content too near the edge of the page!

Custom made bespoke sizes are only available on large quantity orders! 50-100+off

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