Model railway scale calculator
Convert between the real world and the layout.
In the real world
0.87
from 1 cm at 1:87
At 1:87 (HO), standard gauge (1435 mm) scales to 16.49 mm, against the 16.5 mm track the scale is sold on. Metre gauge works out at 11.49 mm, the reason Swiss narrow gauge at this scale runs on 12 mm (HOm) track.