Scale conversion chart.

Here are the decimal conversions for the most common large scale train sizes. All so called G scale trains run on #1 gauge track, 1.75″ (45mm) track gauge. O scale trains run on 1.25″ track gauge.

Large Scale Train Supply scale standard lumber is cut to 1:24 scale. We will gladly cut Western Red Cedar, Red Oak and Cherry to any scale you need on a special order basis. Most special orders can be cut and shipped within five working days.

Scale conversion of inches to decimal
Scale 01:20.3 01:22.5 1:24 1:29 1:32 1:48 1:87
Name
Gn3
 
G Scale
Standard
Standard
O Scale
HO Scale
Prototype
Inches
1 0.049 0.044 0.042 0.034 0.031 0.021 0.011
2 0.099 0.089 0.083 0.069 0.063 0.042 0.023
3 0.148 0.133 0.125 0.103 0.094 0.063 0.034
4 0.197 0.178 0.167 0.138 0.125 0.083 0.046
5 0.246 0.222 0.208 0.172 0.156 0.104 0.057
6 0.296 0.267 0.250 0.207 0.188 0.125 0.069
7 0.345 0.311 0.292 0.241 0.219 0.146 0.080
8 0.394 0.356 0.333 0.276 0.250 0.167 0.092
9 0.443 0.400 0.375 0.310 0.281 0.188 0.103
10 0.493 0.444 0.417 0.345 0.313 0.208 0.115
11 0.542 0.489 0.458 0.379 0.344 0.229 0.126
12 0.591 0.533 0.500 0.414 0.375 0.250 0.138
13 0.640 0.578 0.542 0.448 0.406 0.271 0.149
14 0.690 0.622 0.583 0.483 0.438 0.292 0.161
15 0.739 0.667 0.625 0.517 0.469 0.313 0.172
16 0.788 0.711 0.667 0.552 0.500 0.333 0.184
24 1.182 1.067 1.000 0.828 0.750 0.500 0.276
36 1.773 1.600 1.500 1.241 1.125 0.750 0.414
48 2.365 2.133 2.000 1.655 1.500 1.000 0.552
60 2.956 2.667 2.500 2.069 1.875 1.250 0.690
72 3.547 3.200 3.000 2.483 2.250 1.500 0.828
84 4.138 3.733 3.500 2.897 2.625 1.750 0.966
96 4.729 4.267 4.000 3.310 3.000 2.000 1.103
               
Scale conversion of feet to decimal
Scale 01:20.3 01:22.5 1:24 0.062 1:32 1:48 1:87
Name
Gn3
 
G Scale
Standard
Standard
O Scale
HO Scale
Prototype
Feet
1 0.591 0.533 0.5 0.414 0.375 0.250 0.138
2 1.182 1.067 1 0.828 0.75 0.500 0.276
3 1.773 1.600 1.5 1.241 1.125 0.750 0.414
4 2.365 2.133 2 1.655 1.5 1.000 0.552
5 2.956 2.667 2.5 2.069 1.875 1.250 0.690
6 3.547 3.200 3 2.483 2.25 1.500 0.828
7 4.138 3.733 3.5 2.897 2.625 1.750 0.966
8 4.729 4.267 4 3.310 3 2.000 1.103
9 5.320 4.800 4.5 3.724 3.375 2.250 1.241
10 5.911 5.333 5 4.138 3.75 2.500 1.379
11 6.502 5.867 5.5 4.552 4.125 2.750 1.517
12 7.094 6.400 6 4.966 4.5 3.000 1.655
13 7.685 6.933 6.5 5.379 4.875 3.250 1.793
14 8.276 7.467 7 5.793 5.25 3.500 1.931
15 8.867 8.000 7.5 6.207 5.625 3.750 2.069
16 9.458 8.533 8 6.621 6 4.000 2.207
17 10.049 9.067 8.5 7.034 6.375 4.250 2.345
18 10.640 9.600 9 7.448 6.75 4.500 2.483
19 11.232 10.133 9.5 7.862 7.125 4.750 2.621
20 11.823 10.667 10 8.276 7.5 5.000 2.759
21 12.414 11.200 10.5 8.690 7.875 5.250 2.897
22 13.005 11.733 11 9.103 8.25 5.500 3.034
23 13.596 12.267 11.5 9.517 8.625 5.750 3.172
24 14.187 12.800 12 9.931 9 6.000 3.310
25 14.778 13.333 12.5 10.345 9.375 6.250 3.448
26 15.369 13.867 13 10.759 9.75 6.500 3.586
27 15.961 14.400 13.5 11.172 10.125 6.750 3.724
28 16.552 14.933 14 11.586 10.5 7.000 3.862
29 17.143 15.467 14.5 12.000 10.875 7.250 4.000
30 17.734 16.000 15 12.414 11.25 7.500 4.138

This chart was calculated with Excel and their may be some mistakes. If you find some please let me know. E-mail:rpace@largescaletrainsupply.com

 


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