Measuring a window for a pole

A = length of pole required = width of window plus 30cm

B = Drop of curtains = distance from bottom of rings to floor or below sill..

Measuring a window for a rail


A = length of rail required= width of window plus 30cm

B = Drop of curtains = distance from top of rail to floor or below sill.

Measuring a window for an inside roman blind


A = length of blind required= inside to inside of window reveals

B = drop of blind= top to bottom of window reveals

Measuring a window for an outside roman blind


A = length of blind required= inside to inside of window reveals + 40 cm

B = drop of blind = top to bottom of window reveals +20cm