What you need to start a beanie on circular needles

A beanie on circular needles starts the same way as any other project: you cast on stitches around the needle, then knit in the round without seaming. The main difference from straight needles is that you work continuously in a spiral, which means no purling on the return row and no seam to close at the end. Most beanies use needles between US 6 and US 9, depending on your yarn weight and how tight you knit.

You will need circular needles in a size that matches your yarn—check the yarn label for the recommended needle size. For a typical adult beanie, you need needles that are 16 inches long (the distance between the two needle tips). You also need yarn in a weight that suits the needle size, a yarn needle to weave in ends, and stitch markers to track where each round begins. Many knitters use a removable stitch marker or a piece of contrasting yarn tied around the first stitch.

Before you cast on, measure around the head where the beanie will sit—usually 18 to 22 inches for an adult. Your finished beanie should be about 1 to 2 inches smaller than that measurement so it fits snugly without sliding. Divide your target circumference by the stitch gauge (the number of stitches per inch in your yarn and needle size) to find how many stitches to cast on. If your gauge is 5 stitches per inch and you want a 20-inch beanie, cast on 100 stitches.

Key Takeaways

  • Cast on your stitches using a long-tail cast-on or another method that creates a flexible edge, then join them in a circle without twisting.
  • Knit in stockinette stitch (knit every round) until the beanie reaches the desired length, usually 7 to 8 inches for an adult.
  • Decrease stitches evenly over several rounds once you reach the crown, using either k2tog or ssk decreases spaced around the needle.
  • Cut the yarn, thread it through the remaining stitches, and pull tight to close the top of the beanie.
  • Weave in loose ends with a yarn needle and block the beanie if desired to even out the stitches.

Casting on and joining in the round

The long-tail cast-on is the most common choice for beanies because it creates a stretchy, finished-looking edge. Measure out a tail about three times the length of your finished circumference—for a 20-inch beanie, that is roughly 60 inches. Hold the needle in your right hand and the yarn tail in your left, then follow the standard long-tail method: bring the needle under the thumb loop, over the index finger loop, and back through the thumb loop. Repeat until you have cast on the number of stitches you calculated.

Once all stitches are on the needle, the next step is to join them in a circle. Lay the needle flat and make sure the cast-on edge is not twisted around the needle—the stitches should form a ring, not a spiral. Place a stitch marker on the right needle tip to mark the beginning of the round. Knit the first stitch with the working yarn (the yarn attached to the ball), pulling gently so the join is snug. You are now ready to knit in the round.

Knitting the body of the beanie in stockinette

The body of most beanies is worked in stockinette stitch in the round, which means you knit every stitch of every round. This is simpler than flat stockinette because you never purl—the knit stitches automatically create the smooth V pattern on the outside. Knit each round until the beanie measures about 7 to 8 inches from the cast-on edge. Check the length by trying it on or measuring against a ruler held vertically against the needle.

As you work, the beanie will form a tube around the circular needle. The working yarn will always be at the end of the round where you just finished knitting. When you reach the stitch marker at the start of each new round, slip it from the left needle to the right needle without knitting it, then continue knitting. This keeps the marker in place to show where each round begins.

If you want a ribbed cuff instead of a smooth stockinette edge, work the first 1 to 2 inches in a pattern like knit 2, purl 2 (k2p2 rib). After that, switch to stockinette for the body. Ribbing is stretchy and helps the beanie stay on the head without sliding.

Decreasing stitches for the crown

Once the beanie reaches the desired length, you need to decrease stitches to shape the crown and close the top. Most patterns decrease evenly over 4 to 6 rounds, removing about one-quarter of your stitches in each round. If you cast on 100 stitches, you might decrease 25 stitches in round 1, then 19 in round 2, then 15 in round 3, and so on until only 8 to 10 stitches remain.

The two most common decrease methods are knit 2 together (k2tog) and slip, slip, knit (ssk). K2tog is worked by inserting the needle through two stitches at once and knitting them as one. Ssk is worked by slipping two stitches one at a time, then inserting the left needle through both and knitting them together. Both decrease one stitch, but they lean in opposite directions—k2tog leans right, ssk leans left. Using both in the same round creates a balanced crown.

Space your decreases evenly around the needle. If you are decreasing 25 stitches in a round of 100, place a decrease every 4 stitches. You can mark these positions with stitch markers before you start, or count as you go. After each decrease round, knit one or two plain rounds before decreasing again. This creates a gradual taper instead of a sudden pinch.

Closing the top and finishing

When you have 8 to 10 stitches left on the needle, cut the yarn, leaving a tail about 6 inches long. Thread the tail through a yarn needle, then pass the yarn needle through each remaining stitch on the circular needle, slipping them off as you go. Pull the yarn tight to gather the stitches and close the hole at the top of the beanie. Weave the yarn needle through the stitches a second time for extra security, then pull tight again.

Weave in any loose ends—the cast-on tail and the closing tail—by threading them through nearby stitches on the inside of the beanie. Use the yarn needle to hide the ends inside the fabric so they do not show or come loose. If the beanie looks uneven or the stitches are loose in places, you can block it by wetting it gently, shaping it over a bowl or head form, and letting it dry flat.

Troubleshooting common problems

If your beanie is too tight or too loose, the problem is usually the gauge or the cast-on count. Measure your finished beanie's circumference and compare it to your target. If it is too small, you either cast on too few stitches or your gauge is tighter than expected. If it is too large, you cast on too many stitches or your gauge is looser. Make a note for the next beanie and adjust the cast-on number accordingly.

If you see a gap or hole where you joined the cast-on in the round, this is normal and usually closes up after blocking. If it remains visible, you can use the cast-on tail to tighten the join by weaving it through the first few stitches and pulling gently. If the crown looks bunched or uneven, you may have decreased too quickly. Spread the decreases over more rounds next time, or decrease fewer stitches per round.

If the beanie is too long or too short, measure the body length before you start decreasing and compare it to your pattern or to a beanie you like. Most adult beanies are 7 to 8 inches from cast-on to the start of the crown decreases. Adjust this measurement for your next project based on how the finished beanie fits.

Frequently Asked Questions

Do I have to use a 16-inch circular needle?

No. You can use any length circular needle as long as the circumference of your cast-on stitches fits comfortably on it. Many knitters prefer 16-inch needles for beanies because they are the right size for an adult head circumference. If your cast-on is smaller, you can use a shorter needle or switch to double-pointed needles for the crown when the stitches become too few for the circular needle.

What if I twist the stitches when I join them in the round?

If you knit one round and notice the cast-on edge is twisted, you will have to rip back and rejoin. Twisted stitches create a spiral instead of a ring and are hard to fix once you have knitted past them. Before you knit the first stitch, lay the needle flat and check that the cast-on edge forms a circle, not a twist.

Can I make a beanie with a different stitch pattern instead of stockinette?

Yes. Ribbing, garter stitch, seed stitch, and cable patterns all work on circular needles. Keep in mind that some patterns are denser than stockinette and may require a larger needle size or more stitches to reach the same circumference. Check the gauge for your chosen stitch before you cast on.

How do I know when to start decreasing for the crown?

Most beanies reach the crown when they are 7 to 8 inches long from the cast-on edge. You can measure this by holding a ruler against the needle or by trying the beanie on—it should cover your ears and sit just above your eyebrows. Start decreasing when the beanie reaches this length.

What happens if I run out of yarn before the beanie is finished?

If you are running low on yarn, you can switch to a thinner yarn of a similar color for the crown decreases, or you can cut the beanie shorter and start decreasing earlier. Weigh your yarn as you work—most patterns tell you how much yarn the finished beanie uses, so you can check your progress against the total.