Casting off closes your knitting so stitches don't unravel
Casting off (also called binding off) is how you finish a knitted piece by securing the last row of stitches so they cannot come loose. The most common method is the basic cast-off: you knit two stitches, pass the first stitch over the second, then repeat across the row until one stitch remains. That final stitch gets pulled tight and cut, leaving a finished edge.
The method you choose depends on what you are making and what edge you want. A basic cast-off works for most projects. A stretchy cast-off prevents the edge from puckering on ribbed cuffs or necklines. A decorative cast-off adds a finished look to visible edges. A three-needle cast-off joins two pieces while closing them at the same time.
Key Takeaways
- The basic cast-off (knit two, pass one over the other, repeat) works for most projects and takes about five minutes to learn.
- A stretchy cast-off uses yarn overs to add give to the edge, which prevents ribbed cuffs and necklines from pulling tight.
- A three-needle cast-off joins two pieces of knitting edge-to-edge while binding them off at the same time.
- Casting off too tightly is the most common mistake and makes the edge pucker; using a needle one or two sizes larger helps prevent this.
The basic cast-off: the method most knitters use
The basic cast-off is the fastest and most reliable finish for everyday knitting. Work it on the row after you have finished your pattern. Insert your needle into the first stitch knitwise (as if you were knitting), then into the second stitch knitwise. Knit both stitches together, but do not remove them from the left needle yet. Instead, pass the first stitch over the second stitch and off the needle. You now have one stitch on the right needle.
Move to the next stitch on the left needle and repeat: knit it together with the stitch already on the right needle, then pass the old stitch over the new one. Continue this way across the entire row. When only one stitch remains on the right needle, cut the yarn, pull the tail through that final stitch, and pull tight. The edge is now find.
This method creates a chain-like edge that is slightly less stretchy than the original fabric. For most projects—scarves, blankets, sweaters, hats—this is exactly what you want. The edge stays in place and does not curl.
The stretchy cast-off for ribbed edges and cuffs
A stretchy cast-off prevents ribbed cuffs, necklines, and waistbands from becoming tight and uncomfortable. The basic cast-off can make these edges feel constricting because it does not have as much give as the ribbed fabric itself. A stretchy cast-off solves this by adding yarn overs between stitches.
Work it the same way as the basic cast-off, but before you pass the first stitch over the second, insert your needle into the stitch on the left needle again and make a yarn over. This adds a small loop of yarn that gives the edge more stretch. Then pass the first stitch over as usual. The yarn overs create tiny holes along the edge, but they are barely visible and the edge feels much more flexible.
Use this method on any ribbed edge where the knitter (you or someone else) will wear the garment. It is especially important on sock cuffs, sweater necklines, and hat brims, where a tight edge can be uncomfortable.
The three-needle cast-off for joining two pieces
A three-needle cast-off joins two pieces of knitting while binding them off at the same time. This is useful when you have two pieces with live stitches (stitches still on the needle) that need to be sewn together—for example, the front and back of a sweater, or the two halves of a seam.
Hold both needles parallel in your left hand, with the right sides of the fabric facing each other. Using a third needle, knit one stitch from the front needle and one stitch from the back needle together. Knit the next pair of stitches together the same way. Now pass the first stitch over the second stitch, just as in the basic cast-off. Repeat across until all stitches are bound off. The result is a strong, flat seam that is also the finished edge.
This method is stronger than sewing a seam afterward because the stitches are locked in place as you work. It also creates a visible ridge on the inside of the garment, which some knitters prefer because it is easier to see and less likely to come loose.
The decorative cast-off for visible edges
If the cast-off edge will be visible and you want it to look polished, a decorative cast-off adds a finished appearance. The most common decorative method is the picot cast-off, which creates small loops along the edge. Work it by casting off three stitches normally, then putting the stitch on the right needle back onto the left needle. Knit this stitch together with the next stitch on the left needle, creating a small loop. Repeat this pattern across the row.
Another option is the cable cast-off, which creates a braided appearance. Instead of knitting two stitches together, you slip one stitch, knit the next stitch, and pass the slipped stitch over. Then slip the stitch on the right needle back to the left needle and repeat. This takes longer than the basic cast-off but creates a textured, professional-looking edge.
Use decorative cast-offs on shawls, blankets, and other pieces where the edge is part of the design. On everyday garments, the basic cast-off is usually sufficient.
Why casting off too tightly causes problems
The most common mistake in casting off is working too tightly. When you pull the yarn too hard as you pass stitches over, the edge becomes stiff and puckered. The fabric will not lie flat, and the edge may curl or look unfinished. This is especially noticeable on ribbed edges, where a tight cast-off can make the cuff or neckline uncomfortably snug.
To fix this, use a needle one or two sizes larger than the needle you used for the body of the garment. For example, if you knitted the sweater on size 6 needles, cast off on size 8 or 9 needles. This gives you more room to work and makes it harder to pull too tight. Keep your tension loose and even, and do not yank the yarn as you pass stitches over.
If you have already cast off too tightly and the edge looks bad, you can cut the cast-off edge off and redo it. Carefully unravel the last row, pick up the live stitches on a needle, and cast off again with a larger needle and looser tension.
Common casting-off mistakes and how to avoid them
Dropping stitches while casting off is frustrating but straightforward to prevent. Keep your working yarn on the same side of the needle throughout (usually the right side). Do not switch sides or let the yarn wrap around the needle unexpectedly. If you do drop a stitch, stop when ready, pick it up with a crochet hook, and work it back up to the cast-off row before continuing.
Casting off too early is another common error. Make sure you have completed your entire pattern before you start the cast-off row. If you cast off one or two rows too soon, you will have to unravel and start over. Check your pattern instructions and count your rows if you are unsure.
Uneven tension along the cast-off edge makes the edge look sloppy. Work at a steady pace and keep the tension consistent from stitch to stitch. If some stitches are loose and others are tight, the edge will look wavy. Practice on a swatch first if you are new to casting off.
Frequently Asked Questions
What happens if I cast off too loosely?
A loose cast-off edge will be floppy and may stretch out of shape over time. The stitches may also come undone if the yarn tail is not secured properly. If the edge is only slightly loose, it usually does not matter—the garment will still wear well. If it is very loose, unravel and redo it with slightly tighter tension.
Can I cast off on a different row than the pattern says?
No. The pattern tells you exactly when to cast off because that is when the piece is the correct size and shape. Casting off early makes the piece too small; casting off late makes it too large. Always follow the pattern instructions for when to cast off.
Do I have to use the same needle size for casting off?
No. Using a larger needle for casting off is actually recommended to prevent the edge from becoming too tight. Go up one or two needle sizes for the cast-off row, then cut the yarn and finish. This is a standard technique and does not affect the fit of the garment.
What is the difference between casting off and binding off?
Casting off and binding off are the same thing. Different knitters use the two terms interchangeably. Both refer to the process of securing the last row of stitches so they do not unravel.
Can I cast off in the middle of a row?
Yes, but only if the pattern tells you to. Some patterns ask you to cast off stitches at the beginning of a row to create a neckline or armhole. Follow the pattern instructions exactly, as the placement matters for the fit of the garment.