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7 mm scale
O gauge layout at the Trains and Boats exhibition
Scale	7 mm to 1 ft
Scale ratio	1:43.5
Model gauge	multiple

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

References

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