How to Hem Pants With a Sewing Machine
A machine makes a hem faster only when the setup matches the fabric and the fold is measured, pressed, and controlled before sewing.
Interested in Paid Sewing Work?Test the machine setup
Choose a needle for the fabric type and weight, thread the machine correctly, and test stitch length and tension on matching scrap or hidden allowance. Replace a dull or bent needle.
Prepare an even allowance
Mark the finished line and cutting line separately. Fold and press the allowance according to the chosen finish, checking that the leg opening is not twisted.
Sew without stretching
Start near an inconspicuous seam, keep the fold aligned with a guide, and support the garment so its weight does not pull. Backstitch briefly where appropriate or secure thread ends according to the stitch.
Handle thick seams carefully
Slow down at intersections and keep the presser foot level. Do not pull the fabric or force the handwheel against resistance. Heavy denim may require a jeans needle and a setup designed for multiple layers.
Press and inspect
Press the completed hem with suitable heat, then check for puckering, tunneling, skipped stitches, uneven topstitching, loose threads, and matching leg lengths.
Frequently asked questions
What stitch length should I use?
It depends on fabric, thread, and the appearance you want. Test on matching layers; heavier topstitching often uses a longer stitch than fine fabric.
Do I have to backstitch?
A short backstitch is common for a straight machine hem, but some decorative, chain, or specialty stitches use different methods for securing thread.
Why is the hem puckering?
Possible causes include tension, stitch length, needle choice, thread, fabric stretch, or pressing. Test and correct the setup before continuing.