The Number Of Fabric Widths
First, you need to calculate how many widths of fabric you will need to cover the width of your window. Measure the length of the track or pole you’re using and multiply this figure by 1.5 if you plan to use standard heading tape, or by 2.5 for pencil pleat tape. Now add on 20cm overall for side hems. Divide this figure by the width of your fabric. Round up the result to the next whole number. For example, if your pole measures 200cm, multiply by 1.5 (for standard heading tape), and add on 20cm for hems, which equals 320cm. If your fabric measures 122cm wide, the sum is 320 divided by 122, which equals 2.6. The next whole number is 3. So, three widths of fabric, when gathered, will cover the window, and each curtain will be made of 1½ widths of fabric.
The Cutting Length
Decide on the length of your finished curtains. If you’re using a curtain pole, start measuring from the base of the rings from which the curtains will hang. If you’re using a curtain track, measure from 1cm above the top edge, so the curtain heading will hide the track. For floor-length curtains, allow 1.5cm clearance between the lower edge of the curtain and the floor. If you want your curtains to touch the floor, add 5cm to your measurement and if you want your curtains to puddle on the floor, add 51cm. Finally, add on 3cm for the turning at the top and 12cm for the hem. This measurement is the cutting length for your fabric.
How Much Curtain Fabric To Buy
To calculate how much patterned fabric to buy, take the cutting length and add the length of the pattern repeat. Multiply this new cutting length measurement by the number of fabric widths and add 10cm per curtain. This is the amount of patterned fabric you need to buy.
Drop Length = 135cm
Pattern repeat 27cm
New drop with pattern: 135 + 27 = 162cm
162 x 4 widths = 648cm or 6.48 meters
PLEASE NOTE THAT THE ALL OUR FABRIC OUR SOLD IN LENGTHS OF FULL METER