Make curtains for any size window

These curtains look a little funny here since this is my kitchen. My sister-in-law's window is a bit shorter and wider than my window, but you get the idea.

My sister-in-law moved to a new apartment a few months ago, and I told her I’d make her some curtains. Store-bought curtains can be sooooo expensive and sometimes it’s really hard to find some to match. Well, I finally got around to doing it and here’s what I came up with.

To cut down on costs (and help with matching in bedrooms) I sometimes buy cotton bed sheets instead of purchasing fabric by the yard. You end up with a wide cut often times and that helps avoid having to piece together cuts.

Well, I finally got around to doing making her curtains after all this time and here’s what I came up with.

It’s really not that hard to make your own curtains, but it does involve a little math and a lot of measuring. I’ve done most of the calculations for you, but you have to do your own measuring.

Because you’re doing your own measurements, you’ll need to figure out much fabric you’ll need on your own. You’ll only need some cotton fabric and thread to make basic curtains, but I also bought felt to make insulated/blackout curtains. For tools, you’ll need an iron, a ruler, lots of pins and your sewing machine/needle and thread.


Explanation of measurements

Start by measuring your window – including the casing. To give the curtain some floof, you’ll want to multiply by 1.5, then if you plan to have two panels, divide in half. For the height, just add 3 inches to hang down past the bottom of the frame a little (or you could add more if you wanted). This will be the finished size of your curtain (and if you’re planning to make lined curtains, you’ll want to cut your felt or fleece this size.

Then you’ll need to add seam allowance: Add 3 inches to the width for the side seams. Add 12 inches to height for bottom seam and top ruffle.

Condensed measurements

Measure the height and width of window and casing. Multiply the width by 0.75 and add 3 inches. Add 15 inches to the height. Cut two panels of this size. Repeat for each window.


Start by folding the edge in a half inch on all four sides of each panel. Press the fold with the iron to keep firm.

On the bottom and sides of the curtain, fold and press a 1-inch section on those three sides. on the top, fold down five inches.

Then, unfold and sew mitered corners on the two bottom corners. For a refresher on how to do this, read the tutorial on making receiving blankets or napkins.

Refold and iron again if needed. If you are lining your curtains, place the liner on the back side of the cotton fabric and under the ironed hems on the side.

Pin around the perimeter of the folds and sew along the inside of folds on all four sides.

On the back side of the curtain, measure 1.5 inches up from the top edge seam. Draw a line across the top sew along it parallel to make a pocket for the curtain rod. If you have a large diameter curtain rod, you made to measure 2 to 2.5 inches.

Repeat with the second panel. Trim all threads, then hang.

These curtains look a little funny here since this is my kitchen. My sister-in-law’s window is a bit shorter and wider than my window, but you get the idea.

This post contains affiliate links, which means that if you click on one of the product links, I’ll receive a percentage of the charge if you decide to purchase it. (There’s no additional cost to you, either!) I only recommend things I  really use.