The three ways to join in the round, and which one works best for your project
Joining in the round means connecting your cast-on stitches into a circle so you can knit continuously without turning your work. The three main methods are the slip-stitch join (the most common), the invisible join (leaves almost no seam), and the provisional cast-on join (works best if you plan ahead). Which one you use depends on whether you care about a visible join line, how much time you want to spend, and whether your pattern calls for a specific method.
Most knitters start with the slip-stitch join because it is fast and works on any project. The invisible join takes a few extra minutes but produces a nearly seamless result. The provisional method requires you to cast on differently at the start, so it is mainly useful if you are knitting a hat, cowl, or sweater where a perfect join matters and you have planned for it.
Key Takeaways
- The slip-stitch join is the fastest method: knit to the end of your cast-on row, then slip the first stitch of the round onto your right needle and pass the last stitch over it.
- The invisible join (also called the Kitchener join) uses a tapestry needle to thread through live stitches and creates a join with no visible seam line.
- The provisional cast-on join requires you to cast on with waste yarn at the start, then graft the live stitches together at the end for a completely seamless circle.
- Tension matters at the join: pull your yarn firmly on the first few stitches after joining to prevent a loose gap where the round begins.
- Practice the slip-stitch join first, since it works on any project and teaches you the basic motion before moving to more advanced methods.
The slip-stitch join: fast and visible
The slip-stitch join is the standard method taught in most knitting books. You cast on your stitches as usual, then on the first row you knit all the way around until you reach the stitch you cast on first. At that point, you slip the first stitch of the round onto your right needle without knitting it, then pass the last stitch you just knitted over it (the same motion as binding off one stitch). This closes the circle.
The join creates a small visible line where the round closes, but it is barely noticeable once you have knitted a few rounds above it. The advantage is speed: you do not need to set up anything special or use a tapestry needle. The disadvantage is that the join is there if you look for it, which matters most on projects like sweater yokes or the tops of hats where people might see it.
To prevent a loose gap at the join, pull your working yarn firmly when you knit the first stitch of the next round. Many knitters pull extra hard on the first two or three stitches to tighten the join. If you still see a gap after the first round, you can tighten it by threading your tapestry needle through those stitches and pulling gently from the inside.
The invisible join: seamless but slower
The invisible join (sometimes called the Kitchener join or grafting join) produces a seam so faint that most people will not see it. It takes longer than the slip-stitch method, but the result is worth it for visible projects like the crown of a hat or the top of a sweater yoke.
To do the invisible join, cast on your stitches and knit one full round, ending where you started. Do not join yet. Instead, cut your yarn, leaving a tail about 6 inches long. Thread that tail onto a tapestry needle. Now you will use the Kitchener stitch (also called grafting) to join the live stitches at the end of your round to the cast-on stitches at the beginning. Insert the tapestry needle through the first cast-on stitch from front to back, then through the first live stitch (the one on your needle) from back to front. Continue alternating: front to back through the cast-on row, back to front through the live stitches, moving one stitch forward each time. When you reach the end, pull the tail snug and weave it in.
This method works best on stockinette stitch (knit stitch) because the Kitchener stitch mimics the look of knit rows. On textured stitches like ribbing or garter stitch, the join can be harder to hide. Practice the Kitchener stitch on a swatch first if you have not done it before.
The provisional cast-on join: seamless from the start
The provisional cast-on join requires you to plan ahead. Instead of casting on with your working yarn, you cast on with waste yarn (a scrap of yarn in a contrasting color that you will remove later). You then knit your entire project, and at the end you remove the waste yarn to expose the live stitches from your cast-on row. You graft those live stitches to the live stitches at the end of your project using the Kitchener stitch, creating a completely seamless join.
This method is most common for hats, cowls, and sweaters where the join will be visible and you want it to be perfect. It takes the most time because you have to graft at the end, but the result is a circle with no seam at all. The join looks exactly like any other row of knitting.
To cast on provisionally, use a crochet hook or needle in a larger size and your waste yarn to create a chain. Then pick up stitches from that chain with your working yarn and your regular needles. When you are done knitting, carefully pull the waste yarn out (usually by pulling one end of the chain), and the live stitches will come free. Graft them to your final stitches using Kitchener stitch.
Fixing a loose join and tension problems
The most common problem at the join is a loose gap where the round closes. This happens because the yarn between the last stitch and the first stitch has to travel a little farther than a normal stitch, so it pulls looser if you do not compensate. The fix is straightforward: pull your working yarn firmly on the first stitch of the next round, and again on the second stitch if needed.
If you have already finished a few rounds and the gap is still visible, you can tighten it after the fact. Thread your tapestry needle with the same yarn you used for the project (or a matching color). From the inside of your work, weave the needle through the loose stitches at the join, pulling gently to tighten them. This works best if the gap is small. If the gap is large, you may need to rip back and rejoin.
Another common problem is a twisted join, where your cast-on row is twisted around your needles. Before you join, lay your work flat and make sure the cast-on edge is not twisted. This is especially important with the slip-stitch join because once you slip-stitch, you cannot untwist without ripping back.
Choosing the right join for your project
Use the slip-stitch join for everyday projects like socks, sleeves, and the body of sweaters where the join will not be highly visible. It is fast and reliable, and the small seam line disappears into the fabric once you have knitted a few rounds.
Use the invisible join for projects where the join will be seen, such as the crown of a hat, the top of a sweater yoke, or a cowl worn close to the face. The extra time is worth it because the join is nearly invisible.
Use the provisional cast-on join if you are knitting a hat, cowl, or circular sweater and you want a completely seamless join and you are willing to plan ahead. This method requires the most setup and the most finishing work, but the result is perfect.
Frequently Asked Questions
What if I forget to join and I knit a few stitches flat by accident?
Rip back to your cast-on row and start over. Joining after you have already knitted flat stitches creates a twisted mess that is harder to fix than straightforward starting again. It only takes a few minutes to recast and rejoin.
Can I use the slip-stitch join on ribbing or other textured stitches?
Yes, but the join will be more visible because the texture makes it harder to hide. If the join matters on a ribbed project, use the invisible join or the provisional cast-on join instead. Both work on any stitch pattern.
How tight should I pull the yarn when I join?
Pull firmly enough that the join does not gap, but not so hard that you distort the stitches. The first stitch after the join should be about the same size as the stitches around it. If you pull too hard, the join will pucker. If you do not pull hard enough, it will be loose.
Do I need special needles to join in the round?
No. You can join in the round on circular needles, double-pointed needles, or even two straight needles if you are working a small project. The join method does not change based on your needle type.
What is waste yarn and where do I get it?
Waste yarn is any scrap yarn you do not mind throwing away. It should be a different color from your project yarn so you can see it easily. You can use leftover yarn from another project, or buy a small ball of inexpensive yarn. It does not need to match your project yarn at all.