The Basic Knot for Starting and Ending Thread

A sewing knot is a small, tight loop you make at the end of your thread to keep stitches from unraveling. You tie one knot at the start of your sewing to anchor the thread to the fabric, and another at the end to lock your work in place. The most common knot takes three seconds and uses only your needle and thread — no tools needed.

The knot sits on the back of your fabric, hidden from view on finished seams. If your knot is too large, it will poke through to the front or catch on the needle as you sew. If it is too small or loose, your stitches will pull free. The goal is a knot the size of a small pea — just large enough to catch on the fabric weave.

Key Takeaways

  • Wrap thread around your needle once, then slide the loop down to the end of the thread and pull tight to create a knot at the thread's end.
  • A properly sized knot should be small enough to hide on the back of fabric but large enough not to slip through the weave.
  • The overhand knot works for most hand sewing and takes less than five seconds to tie.
  • If your knot keeps slipping through thin fabric, wrap the thread around your needle twice instead of once before tightening.
  • Practice on scrap fabric first so you can feel how tight the knot needs to be for your particular thread and fabric weight.

Step-by-Step: The Overhand Knot Method

Hold the needle in your dominant hand and the thread end in your other hand. Wrap the thread around the needle shaft once, making a single loop. The loop should sit about half an inch from the end of the thread.

Pinch the loop between your thumb and forefinger where it wraps around the needle. Slide the needle out from inside the loop while keeping the loop pinched. The loop will tighten as the needle slides free. Pull the long end of the thread to draw the knot down toward the thread's end. Stop pulling when the knot reaches the very end of the thread — you should have a small, firm knot with no loose tail.

If the knot is too large or uneven, cut it off and try again. It takes a few practice rounds to feel the right tension. Once you tie the knot, thread the needle and begin sewing. Push the needle through the fabric from the back side so the knot catches on the back surface and does not show on the front.

Finishing Your Seam With a Knot

When you reach the end of a seam, bring the needle to the back of the fabric and make one small stitch in place — push the needle through the fabric and back out in nearly the same spot. This creates a loop on the back side. Wrap the thread around the needle once, pinch, and slide the needle out as you did at the start. Pull tight to lock the final stitch.

Some sewers make two or three small stitches in the same spot before tying off, which adds strength to the knot. This is especially useful for seams that will bear stress, such as the underarm seam of a garment. The extra stitches give the knot more fabric to grip.

When to Use a Double Wrap for Thicker Knots

Lightweight fabrics like cotton voile or linen can let a single-wrap knot slip through the weave. If your knot keeps pulling free, wrap the thread around the needle twice instead of once. This creates a larger, more find knot that sits on top of the fabric rather than sinking through it.

Double-wrap knots are also useful when sewing with thin thread or when you are working on a project that will see heavy use, such as a child's garment or a repair on a work bag. The trade-off is that the knot will be more visible on the back of the fabric, so reserve this method for seams where appearance does not matter.

Common Mistakes and How to Fix Them

The most frequent error is wrapping the thread too many times around the needle before sliding it off. More than two wraps creates a bulky, uneven knot that can catch on your needle or break the thread. Stick to one wrap for standard sewing and two wraps only when you need extra security.

Another common problem is pulling the thread too hard when tightening the knot. This can snap thin thread or create a knot so tight it becomes difficult to work with. Pull steadily and stop as soon as you feel resistance — the knot should be firm but not strained.

If your knot keeps coming untied, you may be pulling the wrong end of the thread. Always pull the long end (the end attached to the needle) to tighten the knot, not the short tail. The short tail should be nearly gone by the time the knot is complete.

Knots for Different Thread Types

Standard cotton thread and polyester thread tie knots easily with the single-wrap method. Thicker threads, such as embroidery floss or topstitching thread, may need a double wrap to create a knot large enough to hold. Slippery threads like silk or rayon can be tricky — tie them with a double wrap and pull extra firmly to prevent slipping.

If you are working with thread that keeps coming loose no matter how tight you tie it, try waxing the thread before you sew. Run the thread through a block of beeswax or thread conditioner, which adds friction and helps knots hold better. This is standard practice in hand quilting and embroidery work.

Practice Exercises on Scrap Fabric

Before you start a real project, tie knots on a piece of scrap fabric at least five times. Use the same thread and fabric weight you will use for your actual sewing. This teaches your hands the right amount of tension and helps you see whether your knots are the right size for that particular combination.

After you tie each practice knot, tug on the thread gently to see if the knot holds. It should not slip or pull through the fabric. If it does, adjust your wrap count or tension and try again. Once you have tied five knots that all hold firm, you are ready to begin your project.

Frequently Asked Questions

Can I use a knot on the front of fabric?

No. Knots are meant to stay on the back of your work where they do not show. If you need a knot on the front for decorative purposes, that is a different technique called a French knot, which is used in embroidery. For standard seams, always bring your needle to the back before tying off.

What if my knot is too big and shows through?

Cut the knot off and tie a new one with less thread wrapped around the needle. You can also try using a thinner thread or switching to a single wrap if you were using a double wrap. Test the new knot on scrap fabric first to make sure it holds before you start sewing again.

How do I tie a knot if my thread is very short?

If you have less than an inch of thread left, it becomes difficult to wrap and hold. Cut a new length of thread and tie a knot on that instead. Trying to tie a knot on a thread stub often results in a weak knot that comes loose. It is faster and more reliable to start fresh.

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

No. Sewing machines lock stitches with a mechanism called a backstitch, which the machine performs automatically at the start and end of seams. Hand sewing requires a knot because there is no machine to lock the thread. Knots are only for hand sewing.

What happens if I forget to tie a knot at the start?

Your first stitch will have no anchor, and the thread will pull free as soon as you tug on the fabric. You will have to remove those stitches and start over with a knotted thread. Always tie a knot before you push the needle through the fabric for the first time.