Carl’s Guide to Scales and Gauges Commonly Used for Small Layouts

I’ve received a number of questions recently about the scales and gauges
used in model railroading around the world. So I’m repeating here a table
that first appeared in my book, Creating Micro Layouts. I’ve added 
a few
more scale/gauge combinations and welcome your additional suggestions.

Gauge Name Scale Proto-
type
Propor-
tion
Comments
1.75in (45mm)
7/8 7/8in = 1ft 24 in 1:13.7 Very large trains; for scratchbuilders
Fn3 15mm = 1ft 36 in 1:20.3 Variant of G, mainly Bachmann
Gm 45mm = 1m 1000mm 1:22.5 Metre gauge – LGB and others
Hn42 1/2in = 1 ft 42in 1:24 Mainly in New Zealand/Australia
1 3/8in = 1ft 56.5in 1:32 Standard gauge – Märklin and others
1.25in (32mm) 7/8 7/8in = 1ft 18in 1:13.7 For scratchbuilders
SM32 16mm = 1ft 24in 1:19 Mainly in garden railways
Hn30 1/2in = 1 ft 30in 1:24 For scratchbuilders
1m 3/8in = 1ft 1000mm 1:32 European metre gauge
9 Mil 9mm = 1 ft 42in 1:32 Used mainly in NZ 
O (U.K.) 7mm = 1ft 56.5in 1:43.5 Standard gauge – many mfgrs
O(Europe) 1435mm 1:45 Standard (normal) gauge – many mfgrs
O (U.S.) 1/4in = 1ft 56.5in 1:48 Standard gauge – many mfgrs
7/8in  S 3/16in = 1ft 56..5in 1:64 Standard gauge
3/4in 1n2 3/8in = 1ft 24in 1:32 For scratchbuilders
On3 1/4in = 1ft 36in 1:48 Primarily in U.S.
16.5mm Gn15 13.5mm = 1ft 15in 1:22.5 A few mfgrs
Hn18 1/2in = 1ft 18in 1:24 A few mfgrs
1n21 3/8in = 1ft 20-22in 1:32 For scratchbuilders
1/36 8.5mm = 1ft 24in 1:36 For scratchbuilders
O16.5 7mm = 1ft ~28in 1:43.5 Popular in U.K.
On30 1/4in = 1ft 30in 1:48 Popular – Bachmann and others
OO 4mm = 1ft 56.5in 1:76 U.K. Standard gauge, very popular
HO 3.5mm = 1ft 56.5in 1:87 Standard gauge, very popular
14mm On2, O14 7mm = 1ft 24in 1:43.5 Mainly for scratchbuilders – Roy C. Link
12mm OOn3 4mm = 1ft 36in 1:76 U.K. three-foot gauge
HOm 3.5mm = 1 ft 1000mm 1:87 European metre gauge
TT 2.5mm = 1ft 1435mm 1:120 Standard (normal) gauge
10.5mm Sn2 3/16in = 1ft 24in 1:64 Mainly in U.S.
HOn3 3.5mm = 1ft 36in 1:87 Popular in U.S.
9mm O9 7mm = 1ft 15in 1:43.5 Some U.K. mfgrs – Avalon and others
On18 1/4in = 1ft 18in 1:48 A few mfgrs
Sn2 3/16in = 1ft 24in 1:64 Popular in U.S.
OO9 4mm = 1ft 27in 1:76 Popular in U.K.
HOn30 3.5mm = 1ft 30in 1:87 Popular, a number of mfgrs
HOe 3.5mm = 1ft 650-850mm 1:87 Popular in Europe
NZ120 2.5mm = 1ft 42in 1:120 New Zealand TTn42
N .075in = 1ft 56.5in 1:160 Standard gauge, very popular
6.5mm HOn2,
HOi
3.5mm = 1ft 22-24in,400-650mm 1:87 For scratchbuilders
Nn3, Nm .075in = 1ft 36in, 1m 1:160 U.S. three-foot, Europe metre gauge
Z 56.5in 1:220 Standard gauge – Märklin and other

 



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