by spider » Mon Jul 18, 2011 10:41 pm
1 to 50 means that the scale is fifty (50) times smaller than the actual or physical measurements regardless of the measurement unit.
Often, the blueprints explicitly identify the measurement units, e.g.: SCALE 1/8" = 1'-0", which means that one eighth (1/8 or 0.125) of each inch on the blueprint corresponds to one (1) foot of an actual object the blueprint represents.
Take another look at the your architect's blueprint to make sure that the scale reads 1=50 without any measurement unit.
If indeed, there are no measurement units listed on both sides of the 1=50 equation, then:
1cm=50cm
1/2"=50/2"=25"=2'1"