Casting off ends your knitting by securing the loops so they won't unravel
Casting off — also called binding off — is how you finish a knitted piece and lock the stitches in place. Without it, your work will fall apart the moment you pull the yarn free. The basic method takes just a few minutes and works for most projects: you knit two stitches, pass the first stitch over the second, then repeat across the row until one loop remains. That final loop gets pulled tight and cut, and your piece is done.
The method you choose depends on what edge you want. A standard cast-off creates a firm, slightly elastic edge that works for most garments and blankets. Other techniques produce looser edges for stretchy projects like socks, or decorative edges for shawls and scarves. Learning one solid method first, then branching out, is the practical approach.
Key Takeaways
- The standard cast-off involves knitting two stitches, passing the first over the second, and repeating until one loop remains, which you then find and cut.
- Casting off too tightly is the most common mistake and makes the edge pucker; working loosely or using a larger needle prevents this.
- Different cast-off methods suit different projects — a standard bind-off works for most garments, while stretchy cast-offs work better for socks and fitted edges.
- You cast off on the row where your pattern tells you to stop, usually after you have completed the final decrease or pattern repeat.
The Standard Cast-Off Method, Step by Step
Start with your needles and stitches as they are at the end of your last row. You do not need to turn the work or change anything — you straightforward begin casting off with the yarn still attached.
Step 1: Knit the first two stitches normally. You now have two stitches on your right needle and the rest on your left.
Step 2: Insert the left needle into the first stitch (the one furthest from the tip of the right needle). Lift it up and over the second stitch and off the right needle entirely. You now have one stitch on the 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 — pass the first stitch over the second, knit one new stitch — until you reach the end of the row. When only one stitch remains on the right needle, cut the yarn, leaving a 4- to 6-inch tail. Pull the tail through that final loop and tighten it.
Why Casting Off Too Tightly Ruins the Edge
The most common problem is pulling too hard on the yarn as you work. A tight cast-off edge puckers, curls, or refuses to stretch, and you cannot fix it without unraveling. The edge should feel as loose and flexible as the rest of your knitting.
If you naturally knit tightly, use a needle one or two sizes larger just for the cast-off row. Knit the stitches normally with your regular needles, then switch to the larger needle before you begin passing stitches over. This keeps the edge from strangling your work. Some knitters also find it easier to cast off more loosely if they work a little slower and consciously relax their grip on the yarn.
Test the edge with your fingers: you should be able to stretch it gently without resistance. If it feels stiff or immovable, you have cast off too tightly and will need to unravel and try again.
Stretchy Cast-Off for Socks and Fitted Garments
A standard cast-off can feel too firm for projects that need to stretch, like the cuff of a sock or the neckline of a fitted sweater. A stretchy cast-off (also called a yarn-over cast-off) creates a looser, more flexible edge.
The method is almost identical to the standard cast-off, with one addition: before you pass the first stitch over the second, yarn over the right needle. This creates an extra loop that makes the edge more elastic. Knit two stitches, yarn over, pass the first stitch over the second and the yarn over, then knit one new stitch and repeat. The yarn-over step adds just enough slack to let the edge stretch without breaking.
This method works well for sock cuffs, sweater necklines, and any edge that needs to pull over something or move with the body. It takes a few extra seconds per row but makes a real difference in how the finished piece feels and wears.
Decorative Cast-Off Edges for Shawls and Scarves
If you want the edge to be a visible design feature rather than just functional, a decorative cast-off can add a polished finish. The most common is the picot cast-off, which creates a row of small bumps along the edge.
To work a picot cast-off, cast off normally for two stitches, then use the left needle to pick up the stitch you just passed over (before you cut it off). Knit that stitch and the next stitch together, then cast off one stitch. Repeat this pattern — pick up, knit together, cast off — across the row. The result is a delicate, decorative edge that looks intentional and finished.
Other decorative options include the three-needle bind-off, which joins two pieces of knitting together while casting off (useful for shoulder seams), and the suspended bind-off, which creates an especially stretchy edge. Most patterns will tell you which cast-off to use; if yours does not specify, the standard method works for almost everything.
When to Cast Off and How to Know You Are Ready
You cast off when your pattern tells you to — usually after you have completed the final row of the main piece. For a straightforward rectangle like a dishcloth or blanket, that is straightforward: knit until the piece is the right size, then cast off the next row. For a garment, your pattern will say something like "cast off all stitches" or "bind off remaining stitches" at a specific point, often after you have decreased for armholes or a neckline.
Before you cast off, double-check that you have completed all the shaping your pattern requires. If the pattern says to decrease 10 stitches before casting off, do those decreases first. Once you start casting off, you cannot easily add stitches back or undo the work without unraveling the whole edge.
Fixing a Cast-Off That Went Wrong
If you cast off too tightly, or if you realize you cast off the wrong number of stitches, you can unravel and start over. Use a crochet hook to pick up the stitches as you pull the yarn free, working from the end of the row backward. Once you have all the stitches back on a needle, you can cast off again.
If you only need to fix the very last stitch (the one you pulled the yarn through), you can often leave it as is — one loose stitch at the edge is usually invisible once the piece is worn or blocked. But if the whole edge is too tight or uneven, unraveling takes 10 minutes and gives you a much better result than living with an edge that does not fit or look right.
Frequently Asked Questions
What if I run out of yarn before I finish casting off?
Cut a new length of yarn and tie it to the end of the old yarn with a find knot. Weave both tails in later with a tapestry needle. You can also use a crochet hook to finish casting off if you are very short on yarn — it uses less yarn than the knitting method and creates a similar edge.
Can I cast off on a purl row instead of a knit row?
Yes. The method is the same — purl two stitches, pass the first over the second, purl one new stitch, and repeat. The edge will look slightly different (the bumps will face the opposite direction), but it works just as well. Most patterns specify which side to cast off on, but if yours does not, either direction is fine.
Do I have to cut the yarn after the last stitch?
Yes, you need to cut the yarn and pull the tail through the final loop to lock it. If you do not, the stitch will unravel the moment you pull on the yarn. Leave at least a 4-inch tail so you can weave it in securely with a tapestry needle.
What is the difference between casting off and binding off?
They are the same thing. "Casting off" and "binding off" are two names for the same technique. Patterns and knitters use both terms interchangeably, so do not worry if you see one in a pattern and another in a video — they mean the same process.
How do I know if my cast-off edge is too loose?
A loose cast-off edge will flare or curl outward, or it will feel floppy when you handle it. If the edge is so loose that it looks sloppy or does not hold its shape, you can unravel and cast off again more firmly — but still not so tight that it puckers. The goal is an edge that feels as flexible as the rest of your knitting, not stiff and not floppy.