Game Design Ideas Measurements Metrics in Drafting

Metrics affects all aspects of drafting, from paper and pen sizes, to dimensioning practices.

This section is intended to give an overall understanding of modern metric practices when it comes to drafting.

Whether the drawings are the product of manual drafting techniques or CAD, the standards are still the same.

Metrics in Drafting

Paper Sizes Click here for information on metric and non-metric paper sizes. Drawing Sheet Layout Click here for information on standard drawing sheet layouts. Pen Sizes and Line Types Click here for information on metric pen sizes and line types. Scales Click here for information on the scales used under the metric system. Dimensioning Click here for information on how to correctly label dimensions on your drawings.

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Paper Sizes

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The ISO 'A' Series

The ISO 'A' series of sheet sizes is based on a constant width to length ratio of 1:square root2.

The A0 size is defined as having an area of one square meter. This allows paper weights to be expressed in grams per square meter.

Each smaller sheet size is exactly half the area of the previous size. ie. 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 ...

This relationship of 1:square root2 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.

Dimensions of Regular Sheets

Designation Dimensions A0 841 mm x 1189 mm A1 594 mm x 841 mm A2 420 mm x 594 mm A3 297 mm x 420 mm A4 210 mm x 297 mm A5 149 mm x 210 mm

Oversize Sheets

Oversize sheets are used when it is desirable to give extra protection to the drawing sheets by providing a binding or trimming margin.

Dimensions of Oversize Sheets Designation Dimensions RA0 860 mm x 1220 mm RA1 610 mm x 860 mm RA2 430 mm x 610 mm RA3 305 mm x 430 mm RA4 215 mm x 305 mm RA5 153 mm x 215 mm

Rolls

The standard widths for rolls is 860 mm and 610 mm. The length of the drawing sheet can be cut as required to suit each individual drawing.

The ISO 'B' Series

The ISO 'B' series is defined to satisfy the requirements of drawing offices when the differences between the 'A' series sizes is too great.

In practice they are not commonly used.

Dimensions of Regular Sheets Designation Dimensions B0 1000 mm x 1414 mm B1 707 mm x 1000 mm B2 500 mm x 707 mm B3 354 mm x 500 mm B4 250 mm x 354 mm B5 177 mm x 250 mm

Non-Metric Paper Sizes

For reference purposes the following table lists non-metric paper sizes still in use in some parts of the world.

Designation Dimensions (mm) Dimensions (in) US Engineering: ANSI A 215.9 mm x 279.4 mm 8.5" x 11" ANSI B 279.4 mm x 431.8 mm 11" x 17" ANSI C 431.8 mm x 558.8 mm 17" x 22" ANSI D 558.8 mm x 863.6 mm 22" x 34" ANSI E 863.6 mm x 1117.6 mm 34" x 44"

US Architectural: ARCH A 228.6 mm x 304.8 mm 9" X 12" ARCH B 304.8 mm x 457.2 mm 12" X 18" ARCH C 457.2 mm x 609.6 mm 18" X 24" ARCH D 609.6 mm x 914.4 mm 24" X 36" ARCH E 914.4 mm x 1219.2 mm 36" X 48"

Miscellaneous: Letter 215.9 mm x 279.4 mm 8.5" x 11" Legal 215.9 mm x 355.6 mm 8.5" x 14" US Government 203.2 mm x 279.4 mm 8" x 11" Statement 139.7 mm x 215.9 mm 5.5" x 8.5" Executive 184.2 mm x 266.7 mm 7.25" x 10.5" Folio 215.9 mm x 330.2 mm 8.5" x 13" Quarto 215.0 mm x 275.0 mm Tabloid 279.4 mm x 431.8 mm 11" x 17" Ledger 279.4 mm x 431.8 mm 11" x 17"

Paper Sizes

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Paper Sizes

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Paper Sizes

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Paper Sizes

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Paper Sizes

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Further Paper Sizes

• Hârn Paper Scale

North American paper sizes

Size	in × in	mm × mm	Aspect ratio
Letter	Template:Frac × 11	216 × 279	1.2941…
Legal	Template:Frac × 14	216 × 356	1.6470…
Tabloid	11 × 17	279 × 432	1.Template:Overline
Ledger<ref name="PPD">Template:Cite webTemplate:Better source</ref>	17 × 11	432 × 279	0.6470…
Junior Legal	5 × 8	127 × 203	1.6
Half Letter, Memo	Template:Frac × Template:Frac	140 × 216	1.Template:Overline
Government Letter	8 × Template:Frac	203 × 267	1.3125
Government Legal	Template:Frac × 13	216 × 330	1.5294…

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