Circular needles let you knit tubes without seaming
Circular needles are two needle tips connected by a flexible cable. They let you knit in a continuous spiral—called knitting in the round—so you can make seamless socks, hats, sleeves, and sweaters without joining pieces later. The cable holds stitches on both sides while you work, and you rotate your work instead of turning it back and forth like you do with straight needles.
The main difference from flat knitting is that you never turn your work. You cast on, join the stitches into a circle, and then knit every row from the same side. Your right side always faces you. This takes a little practice to get used to, but once you understand the rhythm, many knitters find it faster and more comfortable than flat knitting.
Key Takeaways
- Circular needles come in different lengths (16 inches to 60 inches) and you choose the length based on how many stitches you have, not the finished size of your project.
- You must join your cast-on stitches into a circle before you knit the first row, and a common mistake is accidentally twisting the stitches around the cable.
- The first row after joining is the hardest because stitches are loose and want to fall off; knit the first few stitches tightly and use stitch markers to mark the beginning of each round.
- You knit every round from the same side, so stockinette stitch (knit every stitch) looks smooth instead of bumpy, and purl stitches create texture instead of appearing as the back of your work.
Choose the right needle length for your stitch count
Circular needle length is measured from tip to tip and ranges from 16 inches (for small projects like hat crowns) to 60 inches (for large flat pieces). The length you need depends on how many stitches you are casting on, not on the finished size of your project.
A general rule: your stitches should fit comfortably around the cable with a little slack, but not so much slack that they bunch up. If your stitches are too crowded, they stretch and become loose. If the cable is too long, stitches bunch and are hard to work. For a hat with 100 stitches, a 16-inch needle works well. For a sweater body with 200 stitches, you need a 24-inch or 32-inch needle. Many knitters own needles in several lengths so they can match the project.
If you have only one circular needle and your stitch count is too small for it, you can use the magic loop method—a technique where you pull the cable through the middle of your stitches to create two working sections. This is useful but slower, so most knitters eventually buy a smaller needle rather than rely on it.
Cast on and join your stitches without twisting
Cast on the number of stitches your pattern calls for using both needle tips, just as you would with straight needles. Lay the needle flat on a table after you finish casting on and look at the stitches. The cast-on edge should form a straight line around the cable, not spiral or twist around it. This is the most common mistake: a twisted cast-on is almost impossible to fix once you start knitting.
To join, hold the needle so the working yarn is attached to the right needle tip. Knit the first stitch of the left needle tip with the working yarn. This connects the last cast-on stitch to the first cast-on stitch and closes the circle. You are now knitting in the round. Some knitters slip the first stitch of the first round to make the join neater, but this is optional.
Place a stitch marker on the right needle tip after you knit the first stitch. This marks the beginning of each round so you know when you have completed one full circle. As you knit, the marker will move around the cable with your working stitches.
Knit the first round tightly to find the join
The first round after joining is the hardest because your cast-on stitches are loose and want to slip off the needle. Knit the first 5 to 10 stitches as tightly as you can manage. Pull the working yarn snug after each stitch. This tightens the join and anchors the stitches so they do not unravel.
After the first round, the tension becomes easier. The stitches are now anchored by the round below them, and you can relax into your normal knitting rhythm. If your first round looks uneven or loose, do not worry—the tension usually evens out by the third or fourth round as the stitches settle.
Understand how stockinette and purl stitches look in the round
In flat knitting, you knit one row and purl the next to create stockinette stitch (the smooth V-pattern). In the round, you knit every stitch of every round to create stockinette. You never purl. This is because you are always looking at the right side of your work, so knit stitches create the smooth V and purl stitches would create bumps.
If your pattern calls for purl stitches in the round, you purl those stitches while knitting the rest. Purl stitches create a textured line or pattern. Ribbing (alternating knit and purl stitches) works the same way in the round as in flat knitting—you knit some stitches and purl others in the same round, and the pattern repeats.
This is why many knitters prefer knitting in the round: stockinette is faster because you only knit, never purl. Flat knitting requires purling every other row, which is slower and harder on the hands.
Rotate your work at the end of each round, not after each row
In flat knitting, you turn your work after every row so the working yarn is always at the right. In the round, you never turn. You knit around the circle, and when you reach the stitch marker again, you have completed one round. straightforward keep knitting the next round without turning.
This takes mental adjustment. Your brain expects to turn the needle, but you do not. Instead, you rotate the cable so the working stitches are in front of you and the empty cable is behind. This is a small movement—just shifting the needle slightly—not a full turn. After a few rounds, this becomes automatic.
Watch for laddering between needle tips if using double-pointed needles
Some knitters use double-pointed needles (four or five short needles with points on both ends) instead of circular needles to knit in the round. The technique is the same, but there is one extra step: you must pull the working yarn snug when you move from one needle to the next, or you will see loose strands called laddering running up your work.
Circular needles avoid this problem because you are always working with the same two tips, so there is no transition between needles. This is one reason many knitters prefer circular needles to double-pointed needles, especially for beginners.
Frequently Asked Questions
What size circular needles do I need for a hat?
Most hats use a 16-inch circular needle because the stitch count is usually 80 to 120 stitches. Check your pattern for the cast-on number, then choose a needle length where the stitches fit snugly around the cable. If your pattern says to use size 7 needles, that refers to the needle thickness, not the length.
Can I use a circular needle for flat knitting?
Yes. You can knit flat on a circular needle by turning your work at the end of each row, just as you would with straight needles. The cable straightforward holds the stitches you are not working on. Many knitters do this because circular needles are more comfortable to hold for long periods.
Why do my stitches look loose at the beginning of each round?
This is normal and usually caused by loose tension when you knit the first stitch after the marker. Knit that stitch tightly and pull the working yarn snug. The looseness evens out by the third or fourth round. If it persists, you may be pulling the yarn too hard between rounds, which stretches the stitches.
What is the magic loop method?
The magic loop method lets you knit small circumferences (like hat crowns) on a long circular needle by pulling the cable through the middle of your stitches to create two working sections. It is useful if you own only one needle size, but it is slower than using the correct needle length. Most knitters learn it as a backup, not a primary method.
Do I need to buy multiple circular needle sizes?
Not at the start. One 24-inch needle in your preferred size works for most projects. As you knit more, you will find that owning needles in 16-inch, 24-inch, and 32-inch lengths makes projects faster and more comfortable. Many knitters build their collection gradually.