Half double crochet (abbreviated hdc in patterns) is the goldilocks stitch. It is taller than single crochet so your fabric grows faster, but shorter than double crochet so it stays dense and warm. Once you can do sc and hdc, you can read most beginner patterns without flinching.
Rachel from Knots & Kneedles works the stitch in under six minutes, sc swatch beside hdc.
What you need
- A 5mm (H/8) hook
- Worsted weight yarn, pale and smooth. Fuzzy yarn hides stitches
- Scissors, a yarn needle, a stitch marker
Ten stitches across is enough to practise on, worked into a foundation chain.
What makes a stitch a half double crochet
The hdc borrows a move from the stitch either side of it. Single crochet uses no yarn over; double crochet uses one and clears the loops in two pulls. Half double crochet takes the yarn over of the double and the one-pull finish of the single, which is where the "half" in the name comes from.
So the yarn wraps over the hook before the hook goes into the stitch, and at the end all three loops come off together. Miss the wrap and you have made an sc. Clear two loops and stop, and you have started a dc. Three loops on the hook halfway through is the checkpoint that says the stitch is on track.
Reading hdc in a pattern
Patterns run on abbreviations, and hdc is half double crochet every time. "Ch 2, hdc in next st, hdc in each st across" means chain two, then one half double crochet into every stitch to the end of the row. Around it sit yo for yarn over, st for stitch, ch for chain and hdc2tog for a decrease. No pattern stops to explain how to do the half double crochet, so how to read a crochet pattern covers the rest.
Half double crochet vs single and double crochet
Single crochet is the short, stiff one that amigurumi runs on. Double crochet is the tall, quick, drapey one behind most granny squares. The hdc sits between them, picked when a piece must grow fast and still hold its shape: beanies, washcloths, cowls, blankets.
The third loop and the camel stitch
Every hdc carries a third horizontal loop behind the usual V, left there by the way the yarn over lies down when all three loops come off at once. No other basic stitch has one. Tip the top of a finished row away from you and you will see it, a line of bars under the two loops you normally work into.
Put the hook under that bar instead and you get the camel stitch, sold in some patterns as the knit stitch look, because the ridges read like stockinette. Same five moves, different insertion point, and a soft rib that suits a beanie brim.
Common half double crochet problems
Edges pulling in. You are losing the last stitch of each row. The final hdc goes into the turning chain of the row below, or into the last true stitch if your pattern does not count that chain. Count until the number stops drifting.
Uneven row height. A chain 2 at the turn sits at about the height of an hdc; a chain 1 gives a tighter edge. Both are in use; rows go uneven when you change your mind halfway through.
Losing the turning chain. Drop a stitch marker into the top of it every row. It looks like a stitch from the front and nothing like one from the back.
Lock in single crochet, double crochet and fastening off next, put the stitch to work on a blanket, then weave in the ends.