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Standard Paper Sizes

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Revision as of 04:24, 24 March 2006; view current revision
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Written by Allan

Created 2-July-2004

Metric ISO Sheets

  • The ratio length to width of ISO sheets is 1 : Square Root 2. A square root is a number that when multiplied by itself will produce the given number (the square).
  • An A0 sheet is 1m². This allows paper weights to be expressed in grams per square meter. Example: 110gsm paper.
  • This relationship of 1: Sq root 2 is particularly important for reduction onto microfilm, or reduction and enlargement on photocopiers. All metric equipment including microfilm cameras, microfilm printers, photocopiers, and even drawing pen sizes, are designed around this ratio. This makes the process of archiving drawings, resizing, and modifying drawings easy.
  • Each smaller sheet size is exactly half the area of the previous size. If you cut an A0 sheet in half you get two A1 sheets; If you cut an A1 sheet in half you get two A2 sheets; and so on ...
  • The standard widths for rolls is 860 mm and 610 mm.
  • ISO is an acronym for International Organization for Standardization
  • * Oversize sheets are used when it is desirable to give extra protection to the drawing sheets by providing a binding or trimming margin.
Cut Sizes of Metric
ISO Sheets
Designation Width (mm) Length (mm)
A0 841 1189
A1 594 841
A2 420 594
A3 297 420
A4 210 297
A5 149 210
B1 707 1000
B2 500 707
B3 353 500
B4 250 253
Cut Sizes of Oversized* Metric
ISO Sheets
Designation Width (mm) Length (mm)
RA0 860 1220
RA1 610 860
RA2 430 610
RA3 305 430
RA4 215 305
RA5 153 215
RB1 723 1019
RB2 510 723
RB3 361 510
RB4 255 361
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