When building Ho model buildings what measurement would equal one foot
In HO scale, 3.5 millimetres represents 1 real foot; this awkward ratio works out to about 1:87.086. In HO, rails are usually spaced 16.5 millimeters apart which models the standard railroad gauge of 4′ 8.5″ or 1435mm.


In HO scale, 3.5 millimetres represents 1 real foot; this awkward ratio works out to about 1:87.086. In HO, rails are usually spaced 16.5 millimeters apart which models the standard railroad gauge of 4' 8.5" or 1435mm.
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I strongly suggest you purchase a 1/87th scale ruler from your hobby shop. They are invaluable. I model in N-scale (1/60th) and O scale (1/48th) as well as HO. These rulers are inexpensive — you can buy them in either metal or plastic. I reccommend the metal ones.