_Blinds Avenue How To Measure Your Windows And How To Choose Your Shades « Decide to install the shade with inside mount or outside mount. # Use.a metal tape Width CENTER jay Inside Mount Outside Morita + Width Take 3 measurements; = Width = Measure the exact width of including top, center; and bottom. the area to be covered. The overlap is Order the shade width "+ 1%” usually 1.52" on seaside. smaller'than the narrowest * Height« Measure the height that to measurement.