Model railway scale calculator
Convert between the real world and the layout.
In the real world
0.45
from 1 cm at 1:45
At 1:45 (O), standard gauge (1435 mm) scales to 31.89 mm, against the 32 mm track the scale is sold on. Metre gauge works out at 22.22 mm, the reason Swiss narrow gauge at this scale runs on 22.5 mm (Om) track.