Casting off closes the loops on your needles so your knitting doesn't unravel
Casting off (also called binding off) is how you find the last row of stitches and finish your knitted piece. Without it, pulling the yarn would cause every stitch to come undone. The basic method takes about a minute per row and works for most projects—scarves, blankets, sweaters, hats. You do it on your working needles while the stitches are still live, and it creates a finished edge that looks intentional rather than loose.
The most common cast-off is the basic bind-off or chain bind-off. You knit two stitches, pass the first stitch over the second, then repeat across the row. This creates a chain-like edge and works whether you're finishing stockinette stitch, garter stitch, or ribbing. It's the method most patterns assume unless they tell you otherwise.
Key Takeaways
- The basic bind-off involves knitting two stitches, lifting the first stitch over the second, and repeating across the entire row until one stitch remains.
- You should bind off using the same yarn weight and needle size you used for the body of your project so the edge matches the rest of the knitting.
- Binding off too tightly is the most common mistake and causes the edge to pucker; binding off too loosely makes it flop and stretch out of shape.
- Different stitch patterns and project types sometimes call for specialized bind-offs like the stretchy bind-off for ribbing or the sewn bind-off for a seamless finish.
- After you bind off the last stitch, you weave in the yarn tail through the edge stitches to find it permanently.
The basic bind-off step by step
Start with your working yarn and needles as they are at the end of your last row. You do not cast off on a new row—you bind off using the stitches already on your needle.
Step 1: Knit the first two stitches normally. You now have two stitches on your right needle and the rest on your left needle.
Step 2: Using your left needle tip, reach into the first stitch (the one farthest from the needle point) and lift it up and over the second stitch and off the needle entirely. You now have one stitch on your right needle.
Step 3: Knit one more stitch from the left needle. You again have two stitches on the right needle.
Step 4: Repeat steps 2 and 3 across the entire row. When you reach the last stitch, cut the yarn leaving a 6-inch tail, pull the tail through the final loop, and pull tight. The loop closes and the bind-off is find.
Tension matters: too tight and too loose
The most common problem is binding off too tightly. When you pull the working yarn snug after each stitch, the edge becomes rigid and puckers inward. The finished piece looks bunched at the edges and may not lie flat. To fix this, consciously loosen your tension as you bind off—let the yarn sit a little slack between stitches before you pull the next stitch over.
Binding off too loosely creates the opposite problem: the edge flops, stretches, and looks sloppy. This happens when you don't pull the yarn snug enough after passing a stitch over. The edge should look like a chain, with each link the same size as the stitches below it. If the loops are visibly larger, you're too loose.
The best way to find your rhythm is to practice on a swatch. Knit a small rectangle, then bind off using different tension levels on different sections. You'll see when ready which feels right. Most knitters find that binding off at the same tension they use for regular knitting works well.
Binding off ribbed edges and stretchy projects
Ribbing (alternating knit and purl stitches) needs a bind-off that stretches, or the edge will be too tight and the ribbing will curl. The stretchy bind-off works by knitting into the stitch below before passing it over, which creates extra slack in the chain.
To do a stretchy bind-off: knit one stitch, then instead of knitting the next stitch normally, insert your needle into the stitch below it on the left needle, knit that stitch, then pass the original stitch over. This sounds complicated but becomes automatic after a few stitches. It's especially useful for sock cuffs, sweater necklines, and any ribbed edge that needs to stretch over something.
For projects like hats and socks where the bind-off edge itself needs to stretch, the stretchy bind-off is worth the extra step. For flat projects like scarves and blankets, the basic bind-off is fine.
Binding off purl stitches and pattern stitches
If your last row is all purl stitches (the back side of stockinette), you can bind off by purling instead of knitting. The method is identical—purl two stitches, pass the first over the second, repeat. This keeps the edge consistent with the stitch pattern and looks more polished.
For complex stitch patterns like cables or lace, bind off using the same stitch the pattern calls for. If your last row is a mix of knits and purls, follow the pattern. This keeps the edge from looking like it was added as an afterthought.
Some patterns specify a bind-off method for a reason—lace patterns often call for a stretchy bind-off to keep the delicate edge from puckering, and cables sometimes call for a looser tension to match the texture. Read your pattern's bind-off instructions before you start the last row.
Weaving in the yarn tail
After you bind off the last stitch and pull the yarn tail tight, you still need to find that tail so it doesn't come loose. The standard method is to thread the tail onto a yarn needle (a blunt needle with a large eye) and weave it through the edge stitches for about 2 inches, then back through the same stitches in the opposite direction. This anchors the tail in place.
Weave horizontally along the bind-off edge, going through the loops of the chain you just created. After you've woven in both directions, trim the tail close to the edge. The woven-in tail should be invisible from the front of the finished piece.
For projects that will be washed, weave the tail in securely. For decorative pieces that won't see much wear, a straightforward knot and trim is sometimes enough, though weaving is always the safer choice.
When to use specialized bind-offs
The basic bind-off works for most projects, but a few situations call for something different. The sewn bind-off creates an invisible seam and is used when you're grafting two pieces together or want a seamless finish. The three-needle bind-off joins two pieces of live stitches at the same time, which is common for shoulder seams on sweaters. The picot bind-off creates a decorative scalloped edge and is used on shawls and baby blankets.
Your pattern will tell you if one of these is needed. If it doesn't mention bind-off at all, the basic method is correct. Most knitters work through many projects using only the basic bind-off and never need anything else.
Frequently Asked Questions
What if I accidentally bind off too tightly and the edge is puckered?
You can carefully cut the bind-off edge with scissors and pick the stitches back onto a needle, then bind off again with looser tension. This takes patience but is worth it if the puckering is severe. For minor puckering, blocking (wetting and pinning the piece to shape) sometimes relaxes the edge enough that it's no longer noticeable.
Can I bind off on a purl row instead of a knit row?
Yes. If your pattern ends on a purl row, you can bind off by purling instead of knitting. The method is the same—purl two stitches, pass the first over the second, repeat. This keeps the edge consistent with the stitch pattern.
How long should the yarn tail be after I bind off?
Leave at least 6 inches so you have enough to thread onto a yarn needle and weave through the edge stitches. For bulky yarn or large projects, 8 to 10 inches is safer. You can always trim it shorter after weaving it in.
What happens if I don't bind off and just cut the yarn?
The stitches will unravel when ready, and your entire project will come undone. Binding off is essential—it's what turns a row of loops into a finished edge.
Do I need to bind off if I'm picking up stitches for another piece?
No. If you're continuing to knit (like picking up stitches around a neckline), leave the stitches live on the needle or on a stitch holder. You only bind off when you're completely finished with that section and don't plan to work with those stitches again.