7 Steps on How to Make Curtains for Half-Moon Windows

Windows can typically come in any shape and size. Arched or half-moon windows are intriguing architectural designs that also add a bit of spice to any interior. Unfortunately, not everyone knows how to make curtains for half-moon windows.


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Some even think it is a bit of a challenge to find a window treatment that suits these odd-shaped panels. However, you can still make a rectangular-shaped curtain for an easy way window treatment. 


Luckily, you can buy a flexible curtain rod or some inexpensive drawer knobs to install your curtains and frame those half-moon windows perfectly. Tailor your curtain and adjust the hemming to accommodate the window’s curve, and you should be good to go. Here are a few window treatments you can choose from

Curved curtains

This might be a bit challenging and requires excessive measuring compared to our other options. However, a curved curtain that perfectly suits your half-moon windows is an excellent, customized, and budget-friendly window treatment.

Step 1: Measuring

Like regular-shaped windows, you also need to measure the height and width of the curtain. You can also decide if you want floor-length drapes or those ending just below the window’s edge. For now, get your measuring tools ready. 


Start by measuring the width of the window since it is the easiest one to take. Run your tape measure from left to right of the window’s edge. Please take note of the measurement because we will need it later.


Get the height of the top of the arch down to your desired curtain length. Whether you want fabric ending above or at the floor itself, it is up to you. Take note of the height from the desired curtain length up to the highest point of the arch. 


From the desired curtain length, run your measuring tape along the outside edge of the window frame and end at the beginning of the arch. Subtract the value from the finished curtain length. This is your arch length. 


Step 2: Compute for curtain’s dimension.

If you already know how to compute the curtain’s dimensions, then this will be an easy step. The process is relatively similar for regular-shaped curtains. Multiply the width by a fullness factor of either 2 or 3. 


Step 3: Make the arch.

For the upper part of the curtain, you might want to get back the arch length measurement. Get a piece of paper that covers the exact size of the arch. You can tape smaller pieces of paper together if a larger one is unavailable. 


Make the paper three inches longer than the arch’s original length. Next, lay it over the window and trace the outline of the arch onto the paper. Mark the entire arc from its beginning at one side and ending at the other. 


Cut along the traced line to form the arch. Draw straight perpendicular lines from the bottom edge until it reaches the arch. Put them an inch apart for the entire pattern–once you have finished drawing the lines, cut along the vertical lines. 


Step 4: Width of panels

To determine the width of panels, get the value you got in step two, and divide it by 2. For a regular-sized half moon window, you only need two panels. Since you already computed for the curtain’s fullness, all you need is to divide that number by two and acquire the width for each panel. 


Finalize the dimensions of the fabric, and don’t forget to add ½ inch of extra material for the hems on all sides. For the curtain rod pockets, add length to cover the rod’s circumference. 


Step 5: Marking the fabric

Using your paper cutouts, lay them across the top of the fabric and draw a new arch line following the tape pieces. Try to draw as smooth a curve as possible. Draw another ½ inch line above the arch and indicate that as your cutting line. This will serve as your ½ inch seam allowance. 


Step 6: Cutting and sewing

Cut the arch of the fabric and lining it to accommodate the pattern piece. Don’t forget to add the additional length for the hemming and crown of the curtain. Sew the side and bottom hems of the curtain together by folding and ironing the edges. Run the fabric under a sewing machine to secure the folds. Do the rod pocket and sew the fabric in place.


Step 7: Hanging

We are at the last step in learning how to make curtains for half moon windows. Slip your rod pocket curtains through the rod and hang them onto the bracket. Adjust the curtain so that it fits the rod perfectly. There should be instructions on how to hang the rod, depending on the manufacturer.



This is a simple rod pocket curtain that can frame those half-moon windows perfectly. However, you don’t always have to go for curved curtains. In fact, you can also experiment with curved blinds and shutters or curtain swags to spice up the look. 


Overall knowing how to make curtains for half moon windows is a stepping stone to figuring out all kinds of window treatments. These are crucial in completing your home’s interior aesthetics. After all, windows and curtains can really put the finishing touches on a particular design.