The two ways to knit a circle

You can knit a circle in two ways: by increasing stitches evenly around a center point, or by knitting in the round on circular needles and increasing at set intervals. The first method—called spiral increases—works best for small circles like coasters or the crown of a hat. The second method—radial increases—gives you more control and works for larger circles like blankets or shawls.

Both methods start the same way: cast on a small number of stitches (usually 4 to 8), then increase stitches in a pattern that keeps the circle flat instead of bunching or ruffling. The difference is in how you space those increases and which needles you use.

Key Takeaways

  • Spiral increases work on double-pointed needles or circular needles and are fastest for small circles, but require you to mark where each round begins.
  • Radial increases use circular needles and give you more even circles because you increase at the same spots in every round, making the pattern easier to follow.
  • Most circles need one increase round for every 6 to 8 rounds of stockinette stitch to stay flat and avoid ruffling or bunching.
  • Marking your increase points with stitch markers prevents mistakes and makes it clear where each new round starts.

Spiral increases on double-pointed needles

Cast on 4 stitches onto one double-pointed needle, then distribute them across three needles (about 1 or 2 stitches per needle). Knit the first round, then place a stitch marker on your working yarn to mark where the round begins. This marker stays in place for the entire circle and tells you when you have completed one full round.

In the second round, knit into the front and back of every stitch (a kfb increase). This doubles your stitch count to 8. In the third round, knit plain. In the fourth round, increase again—but this time, knit 1 stitch, then kfb, then knit 1, then kfb, and repeat. This spaces the increases evenly around the circle. Keep alternating plain rounds with increase rounds, and in each increase round, knit one more stitch between each increase than you did in the last increase round.

The pattern looks like this: Round 1 (increase): kfb in every stitch. Round 2 (plain): knit all. Round 3 (increase): k1, kfb, repeat. Round 4 (plain): knit all. Round 5 (increase): k2, kfb, repeat. Round 6 (plain): knit all. Continue until your circle is the size you want.

Radial increases on circular needles

Cast on 8 stitches onto a circular needle. Place a stitch marker after every 2 stitches (so you have 4 marked sections). Knit the first round plain. In the second round, knit into the front and back of the stitch right before each marker. This creates 4 evenly spaced increases around the circle.

Knit 2 plain rounds, then increase again in the same spots (right before each marker). Repeat this pattern—2 plain rounds, then 1 increase round—until your circle reaches the size you want. Because you always increase in the same spots, the circle stays balanced and flat, and the pattern is easier to remember.

If you want a tighter circle or a different look, you can change how many plain rounds you knit between increase rounds. Fewer plain rounds (like 1 round between increases) create a denser circle. More plain rounds (like 3 or 4) create a looser, more open circle.

Why circles bunch or ruffle

A circle bunches when you do not increase enough stitches. A circle ruffles when you increase too many. The key is matching your increase rate to your stitch gauge and yarn weight. Worsted-weight yarn on size 8 needles usually needs one increase round for every 6 to 8 rounds of stockinette stitch. Fingering-weight yarn on smaller needles may need increases every 4 to 6 rounds.

If your circle is bunching, add more increase rounds. If it is ruffling, space your increase rounds further apart. You can also adjust by increasing more stitches in each increase round (for example, kfb in every other stitch instead of every third stitch) or fewer stitches (kfb in every fourth stitch).

Marking increases so you do not lose track

Use a stitch marker in a contrasting color to mark where each increase happens. Place the marker right after the increased stitch, not before it. This way, when you come around to that marker in the next round, you know exactly where to increase again. Remove the marker as you knit past it, then place it again after the new increase.

If you are using the spiral method, place one marker at the start of the round and move it up as you go. If you are using the radial method, place markers after every increase point and leave them in place for the entire circle. This takes a few extra seconds but prevents the frustration of losing count halfway through.

Common mistakes and how to fix them

The most common mistake is increasing too fast or too slow. If you realize your circle is bunching halfway through, you can add an extra increase round right away—just knit one more increase round than planned, then go back to your normal pattern. If your circle is ruffling, you can skip the next increase round and resume the pattern after that.

Another mistake is losing track of where the round begins on double-pointed needles. If you forget to move your stitch marker, you will not know when you have completed a round and may accidentally knit into the same stitch twice. Always move your marker up as you go, and count your stitches at the end of each round to make sure the number is correct.

Finishing your circle

When your circle is the size you want, cut the yarn and thread it through a tapestry needle. Pull the needle through every stitch on the needle, then pull tight to close the center hole. Weave in the ends on the back side of the circle. If you want a softer edge, you can bind off normally instead of pulling the yarn through, but pulling tight gives a neater finish.

Block your circle on a flat surface with pins to shape it evenly. Wet blocking (pinning the wet circle to a blocking board and letting it dry) works best for wool and wool blends. Steam blocking works for acrylic and synthetic yarns. A blocked circle will be much more even and professional-looking than an unblocked one.

Frequently Asked Questions

Can I knit a circle on straight needles?

No. Straight needles only work for flat pieces. To knit in the round, you need either circular needles or a set of double-pointed needles. If you only have straight needles, you can knit a square and seam it into a circle, but that is not true circular knitting.

What size needles should I use for a circle?

Use the needle size recommended on your yarn label. If the label says size 6 to 8, start with size 7. The needle size affects how tight or loose your circle is, which affects how fast it ruffles or bunches. If your circle is ruffling, try going down a needle size. If it is bunching, try going up a size.

How many stitches should I cast on?

Cast on 4 to 8 stitches, depending on how tight you want the center. Fewer stitches (4) create a tighter center. More stitches (8) create a looser center. For most circles, 6 or 8 stitches is a good starting point. You will increase to many more stitches as you knit outward.

Do I have to use stitch markers?

You do not have to, but they make the work much easier and prevent mistakes. A stitch marker costs less than a dollar and saves you from having to count stitches or guess where to increase. If you do not have markers, you can use a piece of contrasting yarn or even a safety pin, but a real marker is worth buying.

Why does my circle have a hole in the middle?

The hole happens when you cast on too many stitches or do not pull tight when you close the center. Try casting on fewer stitches (4 instead of 8) and pulling the yarn very tight when you thread it through the final stitches. You can also weave the yarn through the center hole a second time to close it more completely.