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Standards
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Metric ISO, Imperial ANSI and USA Architectural Paper Sheet Sizes
Written by Allan Wise
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 1mē. 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 |
|
Imperial ANSI and USA Architectural Sheets
An ANSI A sheet is 1 sq ft.
ANSI is an acronym for American National Standards Institute
Cut Sizes of Imperial ANSI Sheets
Designation |
Width (inches) |
Length (inches) |
ANSI F |
28" |
40" |
ANSI E |
34" |
44" |
ANSI D |
22" |
34" |
ANSI C |
17" |
22" |
ANSI B/Tabloid |
11" |
17" |
ANSI A/Letter |
8.5" |
11" |
|
|
Cut Sizes of USA Architectural Sheets
Designation |
Width (inches) |
Length (inches) |
ARCH F |
30" |
42" |
ARHC E |
36" |
48" |
ARCH D |
24" |
36" |
ARCH C |
18" |
24" |
ARCH B |
12" |
18" |
ARCH A |
9" |
12" |
|
|
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