7 mm scale
O gauge layout at the Trains and Boats exhibition
Scale7 mm to 1 ft
Scale ratio1:43.5
Model gaugemultiple

7 mm scale, also known as British 0 scale is a model railway scale of 1:43.5 (or 7 mm to 1 ft; hence its name). The scale is thus different from American 0 scale (1:48) and European 0 scale (1:45) For standard gauge railways, 32mm gauge, or 0 gauge is most commonly used. ScaleSeven (S7) standard however specifies 33 mm gauge, which is closer to scale. For narrow gauge modelling, 16.5 mm gauge

NameModel gaugeScaled gaugePrototype gauge
Prototype standard gauges
British 0 gauge32 mm (0 gauge)4' 6¾"Standard gauge
ScaleSeven (standard)33 mm4' 8½"4 ft 8+12 in (1,435 mm) standard gauge
Prototype broad gauges
ScaleSeven (Irish)36.75 mm5' 3"5 ft 3 in (1,600 mm) Irish gauge
ScaleSeven (Great Western)49.2 mm7' 0¼"7 ft (2,134 mm) Great Western broad gauge
Prototype narrow gauges
O2121 mm3'3 ft (914 mm)
O16.516.5 mm (H0 gauge)2' 4¼"2' - 2'6"
O1414 mm2'2 ft (610 mm)
O99 mm (N gauge)15½"15 in (381 mm)


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