The basic method: pick up stitches and join on circular needles

To join in the round after knitting flat, you pick up the live stitches from your flat piece, transfer them to circular needles, and knit continuously in a spiral instead of turning your work back and forth. The most common approach is to knit to the end of your flat section, then use a circular needle or set of double-pointed needles to continue without seaming later.

The exact steps depend on whether your flat piece is complete (like a finished rectangle you want to turn into a tube) or whether you're switching mid-project. Most knitters do this when converting a flat cardigan body into a seamless yoke, or when finishing the top of a hat that was started flat.

Key Takeaways

  • You can join in the round by picking up live stitches from a flat piece and transferring them to circular needles, then knitting continuously without turning.
  • If your flat piece is finished, you'll need to pick up stitches along the edges or bind off and graft the sides together before joining in the round.
  • Circular needles work best for most projects, but double-pointed needles or the magic loop method are options if your stitch count is small.
  • The join creates a visible seam line where the flat and round sections meet, which you can hide by placing it at a side seam or center back.
  • Tension often changes when switching from flat to round knitting, so knit a few rounds and check your gauge before committing to the pattern.

Picking up stitches along the edges of a finished flat piece

If you've already finished knitting flat and want to add a ribbed cuff, collar, or border by knitting in the round, you'll pick up stitches along the edge. Use a circular needle one or two sizes smaller than your main needle, and work from the right side of your fabric. Insert the needle under the edge stitch, wrap yarn around, and pull through — one stitch per row along the edge.

The number of stitches you pick up matters. A common rule is to pick up three stitches for every four rows, which prevents puckering and keeps the edge flat. If you're picking up along a bound-off edge instead, pick up one stitch in each stitch across. Once you've picked up all stitches, place a marker at the join point and knit the first round to close the loop.

Grafting the sides and joining live stitches

If you want to switch from flat to round mid-project — for example, finishing a sweater body without side seams — you'll graft the two side edges together using Kitchener stitch, then join the live stitches on your needle to knit in the round. Kitchener stitch creates an invisible seam by threading yarn through the edge stitches of both sides in a specific pattern.

After grafting, your stitches are live and ready on the needle. Place a marker at the graft line (this marks the start of your round), and begin knitting in the round. The graft itself becomes your "seam," and because you're knitting continuously, you won't have a second seam to sew later. This method is cleaner for seamless sweaters and saves finishing time.

Choosing needles: circular, double-pointed, or magic loop

Circular needles are the easiest choice for most stitch counts. They distribute weight evenly, reduce hand strain, and work for any number of stitches above about 40. The cable connecting the two needle tips should be slightly shorter than your stitch count when laid flat, so the stitches don't stretch.

Double-pointed needles (usually sold in sets of four or five) work well for smaller circumferences like sleeves, hats, or socks. You distribute stitches across three or four needles and knit with the fifth, moving the working needle to the back as you complete each section. They're fiddly at first but give you precise control.

The magic loop method uses one long circular needle and a single loop of cable to work small circumferences. You pull a loop of cable through the middle of your stitches, knit half the stitches, then pull the loop again and knit the other half. It takes practice but uses only one needle and works for any stitch count.

Avoiding and fixing the jog at the join

When you knit in the round, the first stitch of each round sits slightly higher than the last stitch of the previous round, creating a visible step or "jog" at the join. This is most noticeable in stockinette stitch and stripes. To minimize it, knit the first stitch of the first round through the back loop, which twists it slightly and helps it sit level with the last stitch.

Another method is to slip the first stitch of the first round, then go back and pick up the loop you slipped and knit it on the next round. This spreads the jog across two rounds and makes it less obvious. If the jog bothers you after you've finished, you can use a tapestry needle to adjust the tension of the stitches at the join, pulling them tighter or looser to blend the step.

Adjusting tension when switching from flat to round

Many knitters find their tension changes when they switch from knitting flat to knitting in the round. Flat knitting involves turning your work and purling every other row, while round knitting means you're always knitting on the right side. Some knitters knit tighter in the round because they're not turning the work; others knit looser because they're not managing the yarn tension across a purl row.

Before you commit to a large section in the round, knit at least four to six rounds and measure your gauge. If it's off by more than half a stitch per inch, adjust your needle size up or down by one size and knit another few rounds to check. It's easier to fix tension early than to rip back after you've knitted several inches.

Placing the join strategically to hide the seam

The join between your flat and round sections creates a visible line, especially if there's a graft or picked-up edge. To make it less noticeable, place the join at a location where a seam would naturally go — usually at a side seam of a sweater or the center back of a hat. If you're working a striped or patterned piece, try to place the join where a color change or pattern repeat happens, which breaks up the line visually.

For a cardigan or jacket, the join often sits at the underarm, where it's hidden by the arm itself. For a pullover, center back is traditional. For a hat, the join can go anywhere, but many knitters put it at the back where it won't be as visible when worn. Think about the finished garment's structure before you pick up stitches or graft, so the join lands in the right spot.

Frequently Asked Questions

Can I join in the round if I've already bound off my flat piece?

Yes, but you'll pick up stitches along the bound-off edge rather than working with live stitches. Pick up one stitch in each bound-off stitch across, then knit in the round as usual. The bound-off edge becomes part of the finished fabric, so this works best for borders or ribbing where you want a finished edge visible.

What if my stitch count is too small for circular needles?

Use double-pointed needles or the magic loop method instead. Both work for any stitch count, including very small circumferences like sock cuffs or the crown of a hat. Double-pointed needles are more traditional; magic loop is faster once you learn the technique.

How do I know if I picked up the right number of stitches?

Lay your work flat and look at the picked-up edge. It should lie flat without puckering or stretching. If it puckers, you picked up too many stitches; if it stretches, you picked up too few. You can adjust by dropping a stitch and re-picking it up, or by increasing or decreasing a few stitches on the first round if the difference is small.

Will the join show in the finished garment?

Yes, there will be a visible line where the flat and round sections meet, especially in solid colors. You can minimize it by placing the join at a natural seam line, adjusting tension at the join, or using a tapestry needle to blend the stitches. Stripes and patterns help hide the join as well.

Do I need to change needle size when I switch to circular needles?

Not necessarily, but check your gauge after knitting a few rounds. Many knitters find their tension shifts slightly when switching from flat to round, so you may need to go up or down one needle size to match your original gauge. Knit a swatch in the round before committing to the full project.