Once you have cut your fabric lay the ride side of your drapery fabric down on top of your lining.
Box pleat curtain tutorial.
My window is 46 wide.
If you are mounting your curtain on a 1 4 board you need to add 5 for the ends of the board and 8 for the pleat in the middle.
So this is how i did my math.
We factored in 8 per pleat an additional 3 on each side for the depth of the board to wrap around the return or the side of the board 1 2 for the 1 4 hem on each side and about a 1 2 for each end to wrap around the back of the board equaling 65 5 total in length.
3 5 3 5 4 11.
As a starting place for the amount of fabric needed for the pleats you can multiply the distance you want the curtain panel to cover by about 2 or 3 depending on how full you want the curtains.
I altered her tutorial just a bit and made my own box pleat curtain.
6 30 it should say lining width face fabric width 6 inches instead of 3 inches.
For each pleat you need to add 8 inches of fabric.
For the box pleat curtain example the window measured 50.
Get the fabric supplies you need at onlinefabricstore.
She does a great job describing how to measure how much fabric you will need with the addition of the pleats hems etc.
Pin your pleats so they measure 8 inches and top stitch 8 inches down on both sides of each pleat making sure to back tack at the bottom.
We decided on 2 pleats so 3 sections of flat fabric.
Return leading edge 4 for sewing the sides.