Always use a metal measuring tape, flexible cloth tapes will not be accurate.

Curtains and drapes come in different widths, keep in mind that 1 ½ to 2 times the width of a window will provide good window coverage. Pinch-pleated drapes have their fullness sewn into them, there is no need to double the width.

The length of curtains and drapes is a matter of taste. They may go to the window sill or fall anywhere below. Allow at least 4 inches above a baseboard heater or radiator.