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Model Railroad Gauge Calculators

Common Scale Conversion Calculator

Prototype
(feet)
G
(inches)
HO
(inches)
N
(inches)

Less Common Scale Conversion Calculator

Prototype
(feet)
O
(inches)
S
(inches)
TT
(inches)
Z
(inches)

Accepted Model Railroad Gauges
 Prototype 
Dimension
Scale Dimension
 GOSHOTTNZ
1"0.044"0.021"0.0156"0.0115"0.0083"0.0063"0.0045"
3"0.133"0.063"0.0469"0.0344"0.0250"0.0188"0.0136"
6"0.267"0.125"0.0938"0.0689"0.0500"0.0375"0.0273"
12"0.533"0.250"0.1875"0.1378"0.1000"0.0750"0.0545"
2'1.067"0.500"0.3750"0.2755"0.2000"0.1500"0.1091"
5'2.667"1.250"0.9375"0.6889"0.5000"0.3750"0.2727"
10'5.333"2.500"1.8750"1.3777"1.0000"0.7500"0.5455"
20'10.667"5.000"3.7500"2.7555"2.0000"1.5000"1.0909"
22.5'1.000'5.625"4.2188"3.0999"2.2500"1.6875"1.2273"
48'2.133'1.000'9.0000"6.6131"4.8000"3.6000"2.6182"
50'2.222'1.042'9.3750"6.8886"5.0000"3.7500"2.7273"
64'2.844'1.333'1.0000'8.8175"6.4000"4.8000"3.4909"
87.1'3.871'1.815'1.3609'1.0000'8.7100"6.5325"4.7509"
100'4.444'2.083'1.5625'1.1481'10.0000"7.5000"5.4545"
120'5.333'2.500'1.8750'1.3777'1.0000'9.0000"6.5455"
160'7.111'3.333'2.5000'1.8370'1.333'1.0000'8.7273"
200'8.889'4.167'3.1250'2.2962'1.667'1.2500'10.9091"
220'9.778'4.583'3.4375'2.5258'1.833'1.3750'1.0000'
1000'44.444'20.833'15.6250'11.4811'8.333'6.2500'4.5455'
5280'234.67'110.00'82.500'60.620'44.000'33.000'24.000'
        
Scale1:22.5 *1:481:641:87.11:1201:1601:220
 * (1:24 also commonly used)

This page was last updated on Dec 12, 2008


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