A rounded hem curves smoothly instead of folding at sharp corners
A rounded hem is a gentle curve sewn into the bottom edge of fabric—most often on circular skirts, tablecloths, or garments where a sharp corner would look stiff or catch on things. Instead of folding the fabric at a 90-degree angle the way you would at a square corner, you gradually curve the fold as you sew, so the hem follows the natural shape of the fabric edge.
The technique works on both a sewing machine and by hand. Machine sewing is faster; hand sewing gives you more control over the curve and is gentler on delicate fabrics. Either way, the fold itself is the hardest part—getting the curve smooth and even before you stitch takes patience, but once it is pinned correctly, the actual sewing is straightforward.
Key Takeaways
- A rounded hem requires you to fold and press a gentle curve into the fabric edge, not a sharp corner, which takes practice to keep even.
- Bias tape or a curved hem foot on a sewing machine makes the curve easier to control than folding raw fabric by hand.
- Hand sewing a rounded hem with a slip stitch or whip stitch is slower but gives you the most control and works on any fabric weight.
- The fold must be pinned and pressed before you sew, or the curve will pucker or ripple as you stitch.
- Test your curve on scrap fabric first, especially if you are using a machine—a curve that is too tight will bunch, and one that is too loose will sag.
Prepare the fabric edge and mark your hem depth
Start by deciding how deep your hem will be. A rounded hem on a skirt or dress is usually between 1 and 1.5 inches deep; a tablecloth or curtain can be deeper. Measure from the finished edge of the fabric (where you want the hem to end) and mark a line that distance inward all the way around. Use tailor's chalk, a fabric pencil, or a water-soluble pen—something you can see clearly and that will wash out later.
If the fabric is very stretchy or loosely woven, trim the raw edge first with pinking shears or a rotary cutter. This reduces fraying and makes the fold easier to control. For most other fabrics, leave the raw edge as is; you will fold it under as part of the hem.
Press the fabric flat with an iron before you begin. Wrinkles will make it harder to see where your curve is and will get locked in when you press the fold.
Fold and pin the curve gradually, working in sections
This is where rounded hems differ from straight ones. Instead of folding the entire hem up at once, you fold it in small sections, curving as you go. Start at one point on the fabric—a seam line is easiest to find again if you need to—and fold up about 2 to 3 inches of fabric along your marked line. The fold should curve gently, not bend sharply.
Pin that section in place with the pins perpendicular to the fold, spacing them about 1 inch apart. Move to the next section, fold another 2 to 3 inches, and pin. Keep the curve consistent—it should look like a smooth arc, not a series of bumps or flat spots. If you see a pucker or a gap between the fold and the marked line, unpin that section and refold it.
Work your way all the way around the fabric. On a circular garment, you will come back to where you started; make sure the curve matches smoothly where the two ends meet, or the seam will be visible.
Press the fold with steam to set the curve
Once the entire hem is pinned, press it with a steam iron set to the temperature appropriate for your fabric. Use the tip of the iron to press along the fold line, following the curve. The steam helps the fabric hold the shape and makes it easier to sew without the fold shifting.
Press gently—do not flatten the curve by pressing too hard. You want the fold to stay rounded, not become a sharp crease. Let the fabric cool completely before you remove the pins, or the curve may spring back out of shape.
If you are working with a very stiff fabric or one that does not hold a crease well, you can use a spray starch or fabric stiffener before pressing. This helps the curve stay in place while you sew.
Sew the hem by machine using a curved presser foot or bias tape
A curved presser foot (also called a roller foot or walking foot with a curve guide) is the easiest machine method. This foot is shaped to follow a gentle curve and keeps the fabric feeding evenly so the hem does not bunch or pucker. Thread your machine with thread that matches the fabric, set the stitch length to 2.0 to 2.5 mm, and sew about 1/4 inch from the fold, catching the raw edge underneath.
If you do not have a curved foot, bias tape is the next best option. Fold the raw edge of the hem under by about 1/4 inch and press. Then unfold it, lay a strip of bias tape along the raw edge (the tape should cover the edge on both sides), and sew through all layers with a straight stitch. Bias tape is stretchy and follows curves without puckering, and it also finishes the raw edge so the hem will not fray.
Without either tool, you can sew a straight stitch close to the fold, but you must sew slowly and watch constantly for puckering. Stop every few inches, lift the presser foot, and check that the curve is still smooth. If it is bunching, you may have folded the curve too tightly—the fabric on the inside of the curve has less room than the fabric on the outside, and too sharp a fold will cause it to bunch up as you sew.
Sew the hem by hand with a slip stitch or whip stitch
Hand sewing gives you the most control and is gentler on delicate fabrics. Thread a hand sewing needle with thread that matches the fabric, and knot the end. Fold the raw edge of the hem under by about 1/4 inch and press it flat.
A slip stitch is the most invisible method. Bring the needle up through the fold of the hem from the inside, then slide the needle through the fold for about 1/4 inch without coming out. Bring the needle out of the fold and insert it directly across into the main fabric, just above the fold. Slide the needle through the main fabric for about 1/4 inch, then bring it back out and insert it back into the fold. Repeat all the way around. The thread stays hidden inside the fold and the main fabric, so the stitch is nearly invisible from the outside.
A whip stitch is faster but slightly more visible. Bring the needle up through the fold, then insert it into the main fabric just above the fold at a slight angle. Bring the needle back out of the main fabric about 1/4 inch away, then insert it back into the fold at the same spot where it came out. The thread wraps around the edge of the fold. This stitch is stronger than a slip stitch and works well on heavier fabrics, but you will see a small line of thread on the outside.
Sew slowly and keep the stitches small and even. On a curve, the stitches on the inside of the curve will be closer together than those on the outside—this is normal and helps the curve lie flat. Tie off the thread when you reach the end, and press the finished hem gently with an iron.
Troubleshoot puckering, rippling, and uneven curves
If the hem puckers as you sew, the curve is too tight. This happens most often on the inside of a curve, where the fabric naturally has less room. Unpick the stitches, refold the curve a little less sharply, and try again. You can also try a longer stitch length (2.5 to 3.0 mm) to give the fabric more room to ease in.
If the hem ripples or waves, the curve is too loose or the fold is not pressed firmly enough. Press the hem again with steam, making sure the fold is smooth all the way around. If rippling continues, the fabric itself may be stretching—this is common on knits or bias-cut fabrics. In that case, use bias tape or a curved presser foot, which both stabilize the fabric as you sew.
If the curve is uneven—bumpy in some places and smooth in others—unpin and refold those sections. It is easier to fix before you sew. If you have already sewn, you can unpick the stitches and re-sew, or leave it as is if the unevenness is small. On a garment you wear, small imperfections are rarely noticeable once the item is on your body.
Frequently Asked Questions
Can I use a regular presser foot to sew a rounded hem on a machine?
Yes, but you must sew slowly and watch for puckering. A curved presser foot or bias tape makes it much easier because they are designed to follow the curve without bunching. If you use a regular foot, stop every few inches to check that the fold is still smooth.
What is the difference between a slip stitch and a whip stitch?
A slip stitch hides the thread inside the fold, so it is nearly invisible from the outside. A whip stitch wraps the thread around the edge of the fold, so you see a small line of thread on the outside. Slip stitch is slower but more invisible; whip stitch is faster and stronger.
Why does my rounded hem keep coming undone?
The stitches may be too far apart, or the thread may be too thin. Use a thread weight that matches your fabric, and keep stitches no more than 1/4 inch apart. If you are hand sewing, make sure you are catching both the fold and the main fabric with each stitch, not just the fold.
Do I have to press the fold before I sew?
Pressing is not strictly required, but it makes sewing much easier because the fold stays in place and does not shift as you work. Without pressing, the curve may move as you sew, causing puckers or an uneven hem. If you skip pressing, sew very slowly and check the curve frequently.
Can I sew a rounded hem on a stretchy fabric like jersey or knit?
Yes, but use bias tape or a curved presser foot because stretchy fabrics are prone to rippling. Hand sewing also works well on knits because you have full control over how much the fabric stretches as you sew. Avoid sewing too tightly, or the hem will pucker.