Appendix F - Text & Scale Factors
CADD Standards • Version 1.0


Text Heights

Dwg Scale

Scale Factor

3/32"

1/8"

3/16"

1/4"

1"=50’

600

56.25

75

112.5

150

1"=20’

240

22.5

30

45

60

1/16"

192

18

24

36

48

3/32"

128

12

16

24

32

1/8"

96

9

12

18

24

3/16"

64

6

8

12

16

1/4"

48

4.5

6

9

12

3/8"

32

3

4

6

8

1/2"

24

2.25

3

4.5

6

1"

12

1.125

1.5

2.25

3

3/4"

16

1.5

2

3

4

1-1/2"

8

0.75

1

1.5

2

3"

4

0.375

0.5

0.75

1

FULL

1

0.09375

0.125

0.1875

0.25

For normal annotation use 3/32" text.
For Title blocks use a combination of 3/32", 1/8" and 1/4" text.
For small labels use 3/16" text.

Scale Factors

.

1/50

1/20

1/16

3/32

1/8

3/16

1/4

3/8

1/2

3/4

1

1-1/2

3

FULL

1/50

1

2.5

3.125

4.6875

6.25

9.375

12.5

18.75

25

37.5

50

75

150

600

1/20

0.4

1

1.25

1.875

2.5

3.75

5

7.5

10

15

20

30

60

240

1/16

0.32

0.8

1

1.5

2

3

4

6

8

12

16

24

48

192

3/32

0.213

0.533

0.667

1

1.333

2

2.667

4

5.33

8

10.67

16

32

128

1/8

0.16

0.4

0.5

.75

1

1.5

2

3

4

6

8

12

24

96

3/16

0.107

0.267

0.333

0.5

0.667

1

1.333

2

2.667

4

5.33

8

16

64

1/4

0.08

0.2

0.25

0.375

0.5

0.75

1

1.5

2

3

4

6

12

48

3/8

0.053

0.133

0.167

0.25

0.333

0.5

0.667

1

1.333

2

2.667

4

8

32

1/2

0.04

0.1

0.125

0.1875

0.25

0.375

0.5

0.75

1

1.5

2

3

6

24

3/4

0.027

0.0667

0.083

0.125

0.167

0.25

0.333

0.5

0.667

1

1.333

2

4

16

1

0.02

0.05

0.063

0.094

0.125

0.1875

0.25

0.375

0.5

0.75

1

1.5

3

12

1-1/2

0.013

0.033

0.042

0.0625

0.083

0.125

0.167

0.25

0.333

0.5

0.667

1

2

8

3

0.006

0.0167

0.021

0.313

0.042

0.0625

0.0833

0.125

0.167

0.25

0.333

0.5

1

4

FULL

0.0017

0.0042

0.0052

0.0078

0.0109

0.0156

0.0208

0.0313

0.0417

0.0625

0.0833

0.125

0.25

1


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Last updated: Saturday, May 23, 1998