S Scale Calculator

S scale (1:64) sits neatly between HO and O, with a loyal following rooted in American Flyer trains. At S scale, an 64 cm real measurement becomes 1 cm on the model.

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What fits at 1:64 (1:64)

Model railroads, scratch-building and layouts that want more heft than HO without the space O scale needs.

Real subjectReal size1:64 model
40 ft boxcar 12.2 m 19.1 cm
EMD F7 locomotive 15.4 m 24.1 cm
Two-storey house (height) 8 m 12.5 cm
Person 1.8 m 2.8 cm

Size comparison at 1:64

Relative model sizes at 1:64 (longest bar = largest model):

1:64 in mm, cm and inches

How common real-world sizes convert to 1:64 model size:

Real sizeModel (mm)Model (cm)Model (inches)
1 m 15.6 mm 1.56 cm 0.615 in
2 m 31.3 mm 3.13 cm 1.23 in
5 m 78.1 mm 7.81 cm 3.08 in
10 m 156 mm 15.6 cm 6.15 in
1 ft 4.76 mm 0.476 cm 0.188 in
6 ft (person) 28.6 mm 2.86 cm 1.13 in

Frequently asked questions

What scale is S?

S scale is 1:64, running on 22.5 mm gauge track — larger than HO (1:87) but smaller than O (1:48).

How tall is an S-scale figure?

A 1.8 m person is about 28 mm tall in S scale (1800 mm ÷ 64).

Related scales

→ See all scales