How to Join Rounds in Crochet & Knitting

Joining a round is how you close the circle — in crochet, with a neat slip stitch into the first stitch of the round; in knitting, by connecting your cast-on row into a loop so the work can travel round and round without a seam. It’s the quiet move behind the angel comforter’s joined half-double rounds, the cushion cover’s big joining round, and the baby beanie earflaps that get joined into the round before the crown even begins.

Step by step

First, know which kind of round you’re working. A joined round is closed at the end of every circuit with a slip stitch, then you chain up and start the next one; a spiral round (most amigurumi) is never closed at all — you just keep going. The two are not interchangeable, so follow the one your pattern names.
To join a crochet round, work the last stitch of the round, then insert your hook into the top of the first stitch of that same round, yarn over, and pull the yarn straight through the stitch and through the loop already on your hook. That single smooth pull-through is the slip stitch join — no extra loop, no knot.
Chain up to the height of the next round’s stitch: chain 1 for single crochet, chain 2 for half double, chain 3 for double crochet. Patterns differ on whether that chain counts as a stitch, and ours always say — if the chain counts, your last stitch of the next round lands in its top; if it doesn’t, it doesn’t exist for counting purposes.
Work the first stitch of the new round into the same stitch you joined into, unless your pattern says otherwise. Starting in the *next* stitch instead is the classic beginner slip — it walks the seam sideways and quietly steals a stitch from every round.
Mark the first stitch of every round with a stitch marker or a scrap of contrast yarn. Joined rounds keep their counts honest only if you can see exactly where each round begins, especially in half double crochet, where the join is easy to lose.
Keep the joins stacked in one invisible line: because every round closes in the same place, joined rounds leave a faint seam, so let that seam live at the back, the side, or under an arm. Our angel comforter’s joined half-double rounds place theirs where it never shows.
Changing colour? Finish the last stitch of the old colour with the new colour *before* you slip stitch the join, and the seam stays crisp instead of wearing a fuzzy two-tone stitch (see our How to Change Colours Cleanly page for the full method).
In knitting, joining happens once, at the very start: spread your cast-on stitches around the needle, check stitch by stitch that none of them is twisted around it — a twist can never be fixed later, only unpicked — then place a marker and knit the first stitch firmly. Many knitters cast on one extra stitch and knit it together with the first stitch on round one to close the little gap at the join.
Count your stitches at the end of every joined round against the pattern’s number. A joined round that ends one stitch out will lean, flare or narrow from there on, and the round where it happened is the cheapest place to fix it.

Patterns that use it

Angel Baby Comforters Crochet Pattern | 3 Lovey Blanket Rattle & Cuddle Cloth PDF, Embroidered Faces

Cushion Covers Crochet Patterns Vol 1 | Aussie Flora Wattle Blossom & Bottlebrush Pillow Cover PDF

Aussie Fauna Tea Cozy Crochet Patterns | Koala, Kangaroo & Joey, Kookaburra | 3 Cozies in 2 Sizes PDF

Aussie Christmas Tea Cozy Crochet Patterns | Pudding, Santa & Gumnut Wreath | 3 Cozies in 2 Sizes PDF

Aussie Baby Beanies Vol 1 | 12 Knitted Baby Beanie Patterns PDF

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Common mistakes

Working the first stitch of the new round into the next stitch instead of the stitch you joined into. The seam walks sideways a step at a time and a stitch quietly vanishes from every round.
Joining into the top of the starting chain rather than the top of the first real stitch, when the chain doesn’t count. Your count drifts by one and the round ends in the wrong place from then on.
In knitting, joining the cast-on into a circle without checking every stitch sits untwisted on the needle. A twist can never be unpicked later — the only fix is starting again, so the check is worth the minute.

Tina’s tips

Mark the first stitch of every round even when you’re sure you can see it — double it in half double crochet, where the join genuinely hides. A marker is cheaper than a recount.
Decide where the seam will live before you start, and keep it there: the back, the side, under an arm. Joined rounds always leave a faint line, so park it somewhere it never has to be looked at.