Cast off means binding off your stitches so they don't unravel
Casting off (also called binding off) is how you finish a knitted piece and find your stitches so they won't come loose. Without it, your work will unravel the moment you remove the needles. The basic idea is straightforward: you loop each stitch over the one next to it, working across the row until one stitch remains, then pull the yarn through that final loop and tighten it.
The method you choose depends on what you're making and what edge you want. A standard cast-off works for most projects. A stretchy cast-off gives you more give in the edge, which matters for ribbed cuffs or necklines. A decorative cast-off creates a finished look. A three-needle cast-off joins two pieces while binding them off at the same time.
Key Takeaways
- Standard cast-off works for most projects and takes about as long as a regular knit row.
- Stretchy cast-off (yarn over method) prevents tight edges on ribbed sections like cuffs and necklines.
- Three-needle cast-off joins two pieces of knitting while binding them off, useful for shoulder seams.
- Always cast off in the pattern you've been working — knit stitches as knit, purl stitches as purl — unless the pattern says otherwise.
Standard cast-off: the method most patterns assume
Standard cast-off is the most common finish and the one most patterns refer to when they say "cast off." Work it on a knit row unless your pattern specifies otherwise. Knit two stitches normally. Then insert your left needle through the first stitch (the one closest to the tip of your right needle) and pull it over the second stitch and off the needle. You now have one stitch on your right needle again. Knit one more stitch, then repeat the pull-over motion.
Keep going across the entire row. When you reach the end and have one stitch left on your right needle, cut your yarn, leaving a tail about 4 inches long. Pull the tail through that final stitch and tighten it. The edge will be firm and neat. This cast-off works well for stockinette stitch, garter stitch, and most other patterns. It does create a slightly tight edge, which is fine for most projects but can feel restrictive on ribbed sections.
Stretchy cast-off: for ribbed edges and necklines
A stretchy cast-off prevents the edge from pulling tight, which matters when you're finishing a ribbed cuff, a neckline, or any edge that needs to stretch. The yarn-over method is the simplest stretchy cast-off. Knit two stitches. Bring your yarn to the front of your work (between the needles). Insert your left needle through the first stitch on your right needle and pull it over the second stitch and off the needle. Bring your yarn to the back. Knit one stitch. Repeat the yarn-forward, pull-over, yarn-back sequence across the row.
The yarn overs create extra slack in each loop, so the edge stretches more easily. This is especially useful on 1×1 ribbing (knit one, purl one) or 2×2 ribbing, where a tight cast-off can make the edge feel strangled. You'll notice the difference when ready when you try to pull the edge — it gives instead of resisting. Cut the yarn and pull through the final stitch the same way you would with standard cast-off.
Three-needle cast-off: joining two pieces while binding off
Three-needle cast-off joins two pieces of knitting and binds them off in one step. It's the standard way to close shoulder seams on sweaters. Hold both pieces with the right sides facing each other and the needles parallel. Insert a third needle (usually the same size or one size larger) through the first stitch on the front needle and the first stitch on the back needle, as if you're going to knit them together. Knit them together as one stitch.
Repeat with the next stitch on each needle, so you have two stitches on your right needle. Pull the first stitch over the second and off the needle, just like standard cast-off. Keep going until all stitches are bound off. When you're done, you'll have a seam that's both joined and finished. The edge sits flat and is less bulky than a seam sewn afterward. This method works best when both pieces have the same number of stitches.
Decorative cast-off: for visible edges you want to showcase
A decorative cast-off creates a finished, intentional look on edges that will be visible and admired — like the edge of a shawl, a blanket, or a garment where the cast-off edge frames the piece. The picot cast-off is one popular choice. Knit two stitches, then use your left needle to pull the stitch closest to the tip of your right needle over the second stitch and off. Knit one stitch. Now cast on one new stitch using the cable cast-on method (insert your needle between the last two stitches on your right needle, wrap yarn, and pull through). Pull the first stitch over this new stitch and off.
Repeat the knit-one, cast-on-one, pull-over sequence across the row. The result is a scalloped, picot edge with small loops. Other decorative options include the sewn cast-off (which uses a tapestry needle and yarn to bind off after removing stitches from the needle) and the crochet cast-off (which uses a crochet hook instead of a knitting needle). These take longer but create a polished, professional finish that draws the eye.
Common mistakes to avoid when casting off
The most common mistake is casting off too tightly. If your cast-off edge looks puckered or pulls the fabric, you're pulling too hard on the yarn as you loop stitches over. Loosen your tension slightly — the loops should slide smoothly. Another mistake is casting off in the wrong stitch. If you're working stockinette stitch (knit on the right side, purl on the wrong side), cast off on a knit row, knitting each stitch as you go. If you cast off on a purl row, the edge will look bumpy.
A third mistake is casting off too quickly and losing track of where you are. Count your stitches before you start, and count again as you go. If you accidentally skip a stitch or pull one over twice, you'll end up with a hole or an uneven edge. Finally, don't cut your yarn too short. Leave at least 4 inches so you have enough tail to weave in later without the knot coming undone.
How to fix a cast-off that went wrong
If you notice a problem right away — a dropped stitch, a hole, or an uneven edge — you can usually fix it before moving on. If the problem is in the last few stitches, you can unravel back to that point, pick up the stitches on your needle, and cast off again. Use a crochet hook to pick up dropped stitches; insert the hook through the stitch and pull the loose yarn through.
If the cast-off edge is already cut and you notice a problem later, you have two options. For a small hole or loose stitch, you can use a tapestry needle and matching yarn to tighten the area by weaving through the stitches. For a larger problem, you can carefully unravel the cast-off row by pulling the yarn tail and picking up the stitches again on a needle, then casting off a second time. This takes patience but is faster than ripping back further into the piece.
Frequently Asked Questions
What's the difference between casting off and binding off?
They're the same thing. "Casting off" and "binding off" are two names for the same technique. British knitters tend to say "cast off," while American knitters often say "bind off," but the method is identical. Use whichever term feels natural to you.
Can I cast off on a purl row instead of a knit row?
Yes, if your pattern tells you to. Most patterns assume you'll cast off on a knit row, but some patterns (especially those ending on a purl row) will say to cast off on the purl side. If you cast off on a purl row, purl each stitch instead of knitting it. The edge will look different but will be equally find.
Why does my cast-off edge look tight and puckered?
You're likely pulling the yarn too tightly as you loop stitches over. Loosen your tension and let the loops slide smoothly over the needle. You can also try casting off on a needle one or two sizes larger than the needles you used for the body of the piece — this creates more slack in the loops and a more relaxed edge.
Do I have to use the standard cast-off method?
No. Standard cast-off works for most projects, but stretchy cast-off is better for ribbed edges, and three-needle cast-off is the standard for shoulder seams. If your pattern specifies a cast-off method, follow that. If it just says "cast off," standard cast-off will work fine.
What happens if I don't cast off?
Your stitches will unravel. The moment you remove the needles, the loops will come loose and your work will fall apart. Always cast off before removing your needles, even if you're just setting the piece down temporarily.