Knitting a circle means increasing stitches evenly so the fabric spreads outward instead of growing in a line
A knitted circle grows from the center outward by adding stitches at regular intervals around each row. Unlike a rectangle, where you cast on a fixed number of stitches and knit straight, a circle requires you to increase—add new stitches—in a pattern that keeps the edges flat and the shape round. The most common method is to space increases evenly around the circumference, doubling the number of stitches roughly every few rows as the circle expands.
You can knit a circle flat on straight needles or in the round on circular needles or double-pointed needles. Flat circles are easier for beginners because you work back and forth the way you would a scarf. In-the-round circles are faster and create a seamless fabric, but they require you to manage stitches on a needle that curves. Both methods use the same increase logic—you just explore it differently.
Key Takeaways
- A flat circle grows by increasing stitches evenly on every other row, with increases spaced to keep the edges from ruffling or puckering.
- The most reliable pattern is to double your stitch count every few rows: cast on 6 stitches, increase to 12, then 24, then 48, and so on.
- Yarn over increases and knit-front-and-back increases are the two simplest methods and work equally well for circles.
- Blocking—pinning the finished circle to shape and steaming or wetting it—is what makes an uneven circle look intentional and flat.
The math behind even increases
A circle stays round when you increase the same number of stitches at the same intervals on every increase row. If you have 12 stitches and want to double them, you increase 12 times in that row—once every stitch. If you have 24 stitches and want to increase 12 times, you increase once every 2 stitches. The pattern is: increase, knit some stitches, increase, knit some stitches, and repeat around.
The simplest approach for a beginner is to cast on 6 stitches, increase every stitch on row 2 (making 12 stitches), then increase every other stitch on row 4 (making 24 stitches), then increase every third stitch on row 6 (making 36 stitches), and continue. This creates a natural spiral that lies flat. You can stop whenever the circle is the size you want—there is no fixed endpoint.
Knitting a flat circle on straight needles
Cast on 6 stitches using the long-tail cast-on or any method you know. Knit the first row straight across. On row 2, increase in every stitch by working a knit-front-and-back increase: knit into the front of the stitch, then knit into the back of the same stitch without dropping it from the needle. This creates two stitches from one. You now have 12 stitches.
Row 3: knit all stitches straight. Row 4: increase every other stitch (knit 1, increase 1, knit 1, increase 1, and so on). You now have 18 stitches. Row 5: knit straight. Row 6: increase every third stitch (knit 2, increase 1, knit 2, increase 1, and so on). You now have 24 stitches. Continue this pattern—knit one row straight, then increase on the next row with the increases spaced one stitch further apart each time—until the circle is as wide as you want.
Bind off when you reach your target size. The edges may look wavy or uneven at this stage. This is normal and will flatten during blocking.
Knitting a circle in the round on circular needles
Cast on 6 stitches onto a circular needle (or use double-pointed needles if your circular needle is too large). Join to knit in the round by placing a stitch marker at the start and knitting the first stitch, being careful not to twist the stitches. Round 1: knit all stitches. Round 2: increase in every stitch using yarn overs or knit-front-and-back. You now have 12 stitches.
Round 3: knit straight. Round 4: increase every other stitch. You now have 18 stitches. Round 5: knit straight. Round 6: increase every third stitch. You now have 24 stitches. Continue until the circle is the size you want, then bind off. In-the-round circles are seamless and often lie flatter than flat circles, but they require you to manage stitches on a curved needle and to keep track of where each round begins.
Two increase methods that work equally well
Knit-front-and-back is the simplest increase. Insert your needle into the front of a stitch, knit it, then insert your needle into the back of the same stitch (without dropping it) and knit again. Two stitches now occupy the space of one. This increase is invisible on the back of the fabric and creates a small bump on the front, which is fine for circles because the increases are part of the design.
Yarn over is an increase that creates a small hole. Bring the yarn to the front of the work, then knit the next stitch normally. The yarn over counts as a new stitch and leaves a decorative eyelet. Yarn overs are faster than knit-front-and-back and create a lacy effect, which works well for doilies or shawls. Both methods produce the same number of stitches; choose whichever feels more natural to your hands.
Blocking makes an uneven circle look intentional
After you bind off, the circle may have wavy edges, uneven tension, or a slightly irregular shape. Blocking fixes this. Wet the circle in cool water, squeeze out excess water gently, then pin it to a blocking board or towel in a circular shape. Use rust-proof pins to anchor the edge stitches to the board, pulling gently so the circle spreads evenly. Let it dry completely—this usually takes 24 hours.
If you do not have a blocking board, you can pin the circle to a clean towel on a flat surface. The goal is to hold the shape while it dries so the fibers set into place. Once dry, the circle will be noticeably flatter and rounder than it was before blocking.
Common mistakes and how to avoid them
The most common mistake is increasing too slowly, which makes the edges ruffle instead of staying flat. If your circle is puckering or cupping, you are not increasing enough. The fix is to increase more often—every other stitch instead of every third stitch, for example. The opposite problem—increasing too fast—makes the edges flare outward like a ruffle. If this happens, space your increases further apart on the next circle.
Another mistake is losing track of where increases should go. Use a stitch marker to mark the start of each round (if knitting in the round) and place markers between each increase section. For example, if you are increasing every third stitch, place a marker after every third stitch so you can see the pattern at a glance. This takes a few extra seconds but saves you from frogging (ripping out) rows later.
Frequently Asked Questions
Can I knit a circle on straight needles or do I need circular needles?
You can knit a circle on straight needles by working flat and increasing on every other row. Circular needles are faster for in-the-round circles, but straight needles work fine and are often easier for beginners because the rhythm is more familiar. The finished circle will look the same either way.
What size should I cast on to start a circle?
Six stitches is the standard starting point and works for most projects. If you want a very large circle, you can start with 8 or 12 stitches, but 6 is the safest choice for your first circle. The starting size does not affect the final size—only how many rows you knit determines that.
How do I know when to stop increasing?
Measure the circle with a ruler or tape measure. When it reaches the width you want, knit one more straight row (without increases) and then bind off. There is no fixed rule—you stop when the circle is the size you need for your project.
Why does my circle have holes in it?
If you used yarn overs as your increase method, the holes are intentional and decorative. If you used knit-front-and-back and still see holes, you may have accidentally created yarn overs instead. Check that you are inserting the needle into the stitch itself, not over the needle.
Do I have to block my circle?
Blocking is not required, but it makes a big difference. An unblocked circle will be flatter and rounder after blocking, and the edges will be more even. If you are making a coaster or a small project, blocking takes 10 minutes and is worth doing.