The amount of fabric needed for the curtains have a perfect fall, it is very simple to calculate, and one need only consider the following steps.
When we wish to make ourselves a curtain, the first difficulty that appears, is how to know how much fabric we should buy, not to be shy if there is little and for not wasting money, in the case of to buy a larger quantity than what is required.
Calculate how much fabric is needed for shade
Width: Measure the width of the window or door more what you want to give to both sides, such as multiplication by 3, so that the folds have enough fabric.
Height: Measure the height from the rail or rod to the ground at least 2 cm, this measure add 25 cm for the hem and 15 cm to the top flange.
With these measures, calculate the amount of cloth required according to the width of the fabric, and then add them. There are fabrics which are not added, come in different widths for cutting to taste, save a lot of work, but tend to be a little more expensive.
When you need to add cloths, trim the edge to not throw and join them with double-stitched (first sew the right and after the reverse).
Mark the bottom hems on a table, either straight. To that fit perfect, a good trick is to pull a string and hemming around. The upper flange is a hem in the case of choosing a barral.
If you have chosen by rails, apply the tape upside down of frowning over the entire width of the curtain; attach the tape with a quilting on the shore and other between two strands of the frowns. Pull on the threads of tape, until you achieve the desired width. Tie a knot with the threads and cut the excess.
Distribute the gathers evenly and can set them with a stitch.