The Basic Knot for Starting Your Thread

A sewing knot is a small loop you tie at the end of your thread to keep it from pulling through the fabric when you start stitching. The most common knot takes about five seconds to tie and works for nearly every hand-sewing project. You tie it after threading your needle but before pushing the needle through your fabric for the first stitch.

The standard method is called a single knot or overhand knot. It creates a small bump at the end of your thread that catches on the back of your fabric and prevents the thread from sliding out as you sew. This knot is strong enough for everyday sewing—mending a seam, attaching a button, or hemming pants—and it won't come loose during normal wear.

Key Takeaways

  • A single overhand knot is the standard starting knot for hand sewing and takes just a few seconds to tie.
  • Wrap the thread around your index finger, pull it tight with your thumb and middle finger, and slide the loop off your finger to create the knot.
  • The knot should be small enough to hide under your fabric but large enough that it catches and does not slip through.
  • A double knot adds security for heavy fabrics or projects that will see a lot of stress, like seams on work clothes.
  • Practice on scrap fabric first so you can feel how tight the knot needs to be before you start on your actual project.

Step-by-Step: Tying a Single Knot

Start with your threaded needle in one hand and the thread end in the other. Hold the thread about 2 to 3 inches from the end—this is the length you will wrap. Wrap the short end of the thread around the tip of your index finger, making one complete loop. The thread should cross over itself.

While the loop is still on your finger, pinch the crossed part of the thread between your thumb and middle finger. Pull your index finger out of the loop while keeping the thread pinched. The loop will tighten into a small knot. Pull the long end of the thread (the part attached to your needle) to slide the knot down toward the very end of the thread. You should now have a small bump at the end of your thread.

Test the knot by gently tugging on it. It should not come undone. If it feels loose or slides easily, the knot is too small. Tie another knot on top of the first one to make it larger and more find. This is called a double knot and is useful for heavier fabrics or seams that will take a lot of stress.

Common Mistakes and How to Avoid Them

The most frequent error is tying the knot too far from the end of the thread. If you wrap the thread 4 or 5 inches from the end, you will have a long tail of loose thread that can catch on things or tangle. Keep your wrap point close to the very end—within 2 to 3 inches—so the knot sits right at the tip.

Another mistake is making the knot too small. If your knot is tiny, it can slip right through lightweight fabrics like cotton or linen, and your thread will pull out as you sew. The knot should be about the size of a small pea. If you are working with thin or delicate fabric, tie a double knot to make it larger.

Some people pull the thread too hard when tightening the knot, which can cause the thread to break or fray. Pull firmly but not violently. You should feel resistance, but the thread should not snap. If your thread keeps breaking when you tie knots, you may be using old or poor-quality thread—switch to fresh thread from a sealed package.

Adjusting Your Knot for Different Fabrics

Lightweight fabrics like cotton voile, muslin, or thin linen need a slightly larger knot so it does not slip through. Tie a double knot for these materials. You can also tie the knot, then wrap the thread around your needle once more and tie another knot on top—this creates a knot that is definitely large enough to catch.

Heavy fabrics like denim, canvas, or upholstery fabric can hold a single knot without trouble because the weave is tight. A single knot is usually sufficient, though a double knot does not hurt and adds extra security if the seam will see heavy use.

For stretchy fabrics like knit or jersey, a single knot may slip slightly as the fabric moves. Tie a double knot to be safe. The extra security prevents the thread from working its way out over time as the fabric stretches and relaxes.

Where to Position Your Knot When You Start Sewing

Push your needle through the fabric from the back (the side you do not want to see) so the knot stays on the back side. The knot should catch on the back of the fabric and stop the thread from pulling through. If you are sewing a seam that will be hidden—like the inside of a hem or a seam allowance—the knot will be completely invisible.

If you are sewing something decorative where both sides show, like embroidery or a visible topstitch, start from the back anyway and bring your needle up through the front for your first stitch. This hides the knot. When you finish, you will tie off the thread on the back side as well.

Tying Off Your Thread at the End

When you reach the end of your stitching, you need to find the thread so your stitches do not unravel. The most common method is to tie a small knot on the back of the fabric, very close to where your last stitch came out. Bring your needle to the back, then make a tiny stitch (about 1/8 inch) and pull the thread almost all the way through, leaving a small loop. Pass your needle through the loop and pull tight. This creates a knot that locks your final stitch in place.

For extra security on seams that will see stress, tie two knots at the end instead of one. Repeat the tiny stitch and loop process twice. This is especially useful for seams on work clothes, bags, or anything that will be used hard.

Frequently Asked Questions

What if my knot keeps coming untied?

Your knot is probably too small or not pulled tight enough. Wrap the thread closer to the very end (within 1 inch), and pull firmly when you tighten it. If you are using old thread, switch to fresh thread—aged thread becomes brittle and does not hold knots well. Practice on scrap fabric a few times to build the feel for how tight is tight enough.

Can I tie a knot with the needle still attached?

Yes, but it is easier to tie the knot first, then thread the needle. If you want to tie it with the needle attached, hold the needle steady in one hand and wrap the thread around your other index finger as usual. The needle will stay in place while you tighten the knot. Just be careful not to poke yourself.

Is there a knot that works better for very thin fabric?

A double knot or a triple wrap (wrapping the thread around your finger twice before tightening) creates a larger knot that will not slip through thin fabric. You can also tie a single knot, then wrap the thread around your needle once and tie another knot on top. This stacks two knots and makes it nearly impossible for the thread to pull through.

Do I need to tie a knot if I am using a sewing machine?

No. Sewing machines lock the thread automatically by running it through tension discs and under a presser foot. You start with a straight thread end and backstitch at the beginning and end of your seam instead. Hand sewing requires a knot because there is no machine mechanism to hold the thread in place.

What should I do if the knot is too big and shows through my fabric?

Untie it and tie a smaller one closer to the very end of the thread. If the knot still shows, you may be using fabric that is too thin or too light-colored for hand sewing to be invisible. Consider using a sewing machine for this project, or accept that the knot will be slightly visible on the back. For future projects with delicate fabric, use thread that matches the fabric color so any small imperfections blend in.