Imperial CAD Scales
Architectural
Scale
Factor
Decimal
1'=1'-0"
1:1
1.0
6"=1'-0"
1:6
0.5
1-1/2"=1'-0"
1:8
0.125
1"=1'-0"
1:12
0.08333
3/4"=1'-0"
1:16
0.06250
1/2"=1'-0"
1:24
0.41667
3/8"=1'-0"
1:32
0.031250
1/4"=1'-0"
1:48
0.020833
3/16"=1'-0"
1:64
0.015625
1/8"=1'-0"
1:96
0.010417
3/32"=1'-0"
1:128
0.007813
1/16"=1'-0"
1:192
0.005208
1/32"=1'-0"
1:384
0.002604
1/64"=1'-0"
1:768
0.001302
1/128"=1'-0"
1:1536
0.000651
Engineering
Scale
Factor
Decimal
1"=10'
1:120
0.008333
1"=20'
1:240
0.004167
1"=30'
1:360
0.002778
1"=40'
1:480
0.002083
1"=50'
1:600
0.001667
1"=60'
1:720
0.001389
1"=70'
1:840
0.001190
1"=80'
1:960
0.001042
1"=90'
1:1080
0.000926
1"=100'
1:1200
0.000833
1"=150'
1:1800
0.000555
1"=200'
1:2400
0.000416
1"=300'
1:3600
0.000277
1"=400'
1:4800
0.000208
1"=500'
1:6000
0.000166