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Job:02-30056 Title: RP-Interior Design Reference and Speciﬁcation
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THE INTERIOR DESIGN REFERENCE + SPECIFICATION BOOK
Text
Chapter 3: Drawing Basics
The ability to draw is essential to the design process. In the interior deign profes-
sion, the meaning of “to draw” takes many forms: It can refer to hand drafting, to
computational drawing, or even to photography and other methods of communica-
tion. A number of standards have been established to facilitate the transmission of
visual data and ideas about a design, and it is important to understand how they
function within the world of the interior designer.
MEASUREMENT IN INTERIOR DESIGN
Before the rst line is drawn, the interior designer must grasp the language of measurement.
The worldwide system of measurement collectively known as the International System of
Units, or SI, is the most widely used standard for determining the length, weight, or volume of
an object and its relation to other objects. It comprises a decimal system whose the base unit
is the meter, which when increased or decreased by a power of 10, generates all other units
of measure. Designers working in the United Sates should be familiar with both the metric
system and the U.S. customary units system. Derived from a method originally developed in
the United Kingdom, the latter is an irregular system that combines several unrelated base
measurementsinches and feet (and their fractioned derivatives), for example—for linear
measurement. Although all federal commissions require projects to be in SI units, the con-
struction industry in North America continues to refer to measurements in customary units (a
2" × 4" piece of wood, a 4' × 8' sheet of plywood), as do many architectural and engineering
practices.
CONVERTING UNITS OF MEASURE
Often, dimensional units are interchanged freely, and it is helpful to know how to translate
between units. Designers will find a range of publications and websites with extensive con-
version tables for length, area, and volume, among other measurements. Numerous online
calculators also allow for swift conversions of specific dimensions. Interior designers will most
frequently turn to the following formulas.
USEFUL CONVERSION FORMULAS
Multiply by to obtain
inches
25.4
millimeters
feet
304.8
millimeters
feet
0.304 8
meters
yards
914.4
millimeters
yards
0.914
meters
Multiply by to obtain
millimeters
0.039 370
inches
millimeters
0.003 281
feet
meters
3.280 8
feet
millimeters
0.001 093 6
yards
meters
1.093 613 3
yards
Multiply by to obtain
square inches
square feet
square feet
square yards
square yards
LINEAR CONVERSIONS
Inches Millimeters (mm) Centimeters (cm) Meters (m)
0.25 6.35 0.635 0.00635
0.5 12.7 1.27 0.0127
0.75 19.1 1.91 0.0191
1 25.4 2.54 0.0254
1.25 31.8 3.18 0.032
1.5 38.1 3.81 0.038
1.75 44.5 4.45 0.045
2 50.8 5.08 0.051
3 76.2 7.62 0.076
4 101.6 10.16 0.102
5 127.0 12.7 0.127
6 152.4 15.24 0.152
7 177.8 17.78 0.178
8 203.2 20.32 0.203
9 228.6 22.86 0.229
10 254.0 25.4 0.254
11 279.4 27.94 0.279
12 304.8 30.48 0.305
24 610.0 61.0 0.610
36 914.5 91.45 0.915
48 1 219.2 121.92 1.219
60 1 524.0 152.4 1.524
72 1 828.8 182.88 1.829
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Job:02-30056 Title: RP-Interior Design Reference and Speciﬁcation
#175 Dtp:216 Page:25
(RAY)
Job:02-30056 Title: RP-Interior Design Reference and Speciﬁcation
#175 Dtp:216 Page:24
024-057_30056.indd 25 3/4/13 7:22 PM
25
Text
tion. A number of standards have been established to facilitate the transmission of
Units, or SI, is the most widely used standard for determining the length, weight, or volume of
an object and its relation to other objects. It comprises a decimal system whose the base unit
struction industry in North America continues to refer to measurements in customary units (a
calculators also allow for swift conversions of specific dimensions. Interior designers will most
Multiply by to obtain
Multiply by to obtain
square inches
645.16
square
millimeters
square feet
92 903.04
square
millimeters
square feet
0.092 903 04
square
millimeters
square yards
836 127.36
square
millimeters
square yards
0.836 127 36
square
millimeters
Multiply by to obtain
square
millimeters
0.001 550 0
square inches
square
millimeters
1.076 391
×
10
-5
square feet
square
millimeters
10.763 910
square feet
square
millimeters
1.195 990×10
-6
square yards
square
millimeters
1.195 990
square yards
LINEAR CONVERSIONS
Inches Millimeters (mm) Centimeters (cm) Meters (m)
0.25 6.35 0.635 0.00635
0.5 12.7 1.27 0.0127
0.75 19.1 1.91 0.0191
1 25.4 2.54 0.0254
1.25 31.8 3.18 0.032
1.5 38.1 3.81 0.038
1.75 44.5 4.45 0.045
2 50.8 5.08 0.051
3 76.2 7.62 0.076
4 101.6 10.16 0.102
5 127.0 12.7 0.127
6 152.4 15.24 0.152
7 177.8 17.78 0.178
8 203.2 20.32 0.203
9 228.6 22.86 0.229
10 254.0 25.4 0.254
11 279.4 27.94 0.279
12 304.8 30.48 0.305
24 610.0 61.0 0.610
36 914.5 91.45 0.915
48 1 219.2 121.92 1.219
60 1 524.0 152.4 1.524
72 1 828.8 182.88 1.829
Job:02-30056 Title: RP-Interior Design Reference and Speciﬁcation
#175 Dtp:216 Page:25
(RAY)
Job:02-30056 Title: RP-Interior Design Reference and Speciﬁcation
#175 Dtp:216 Page:24
024-057_30056.indd 25 3/4/13 8:10 PM

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