Calculating yardage for drapes and curtains can be tricky!
We found an awesome tutorial on the subject by Imagine Design Blog and want to share it.
HOW TO CALCULATE FABRIC YARDAGE FOR DRAPES AND CURTAINS
1. Measure from the top of your curtain rod to where you want your drapes to fall. Some people prefer drapes that end below the window, while others prefer floor-length window treatments. Write this length measurement onto your paper.
2. Measure from one end of your curtain rod to the other to determine the width of your window. This is more accurate than measuring the window itself because your rod likely extends a bit to the left and right of the actual window frame. Write the width measurement down.
3. Add 3-4 inches top & bottom (6-8″ total) to the length measurement to account for seams, a slightly stiffer header to be hung from rings and material used for sewing a rod pocket. For instance, if you need 90-inch drapes, your material will need to be 98 inches long.
4. Multiply the width measurement by 2.5 to account for the fullness needed in proper window treatments. Add 2 inches to this number to account for seams. For instance, if your width measurement is 80 inches, your lengths of material will need to add up to 202 inches wide.
5. Divide your final length measurement by 36 to determine the necessary yardage. There are 36 inches in a yard. If you need 98 inches of length, that is the same as 2.72 yards of fabric.
6. Divide your final width measurement by the width of the fabric you are purchasing. Since most upholstery material is 54 inches in width, you can estimate that you would need about four 2.72-yard lengths of it, or a total of 10.88 yards of material. Most fabric stores will simply round that up to 11 yards of material.
7. Multiply the length of each panel by the amount of panels to get your total yardage.
NOTE: It is imperative that you have the right sewing machine, thread and needles
for the project and type of material used!
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Products for those who sew, serge, quilt and machine embroider:
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