Needles for Knitting Hats: 16-Inch Circulars, DPNs and Magic Loop

Most hats need two kinds of needle: something to carry the full circle of stitches for the brim and body, and something for the crown, where the circle shrinks to a few inches. The usual answer is a 16-inch circular needle plus a set of double-pointed needles (DPNs), or one long circular used for magic loop from start to finish. Here is how each option works, what it is good at, and how to pick the size.

The Three Main Options at a Glance

Needle	Best for	Strengths	Drawbacks
16-inch (40 cm) circular	Brim and body of child and adult hats	Simple and fast; stitches just go around	Cannot finish the crown; too long for baby hats
Double-pointed needles (DPNs)	Crowns and very small hats	Work at any small circumference	Several needles to manage; stitches can slide off the ends
Long circular, 32 to 40 in (80 to 100 cm), for magic loop	A whole hat on one needle, any size	One needle does everything; nothing to swap	Stopping to slide the cable twice per round

The 16-Inch Circular Needle

A circular needle is two short tips joined by a flexible cable. The stated length is measured from tip to tip. On a 16-inch needle the stitches need to reach all the way around without being stretched, so it suits hats with a finished circumference of roughly 17 in (43 cm) and up. That covers child and adult sizes: 88 stitches of worsted weight yarn make a 19.5 in (49.5 cm) hat and slide around comfortably.

Smaller hats are another matter. A baby hat of about 14 in (35.5 cm) will not span a 16-inch needle, so it needs DPNs or magic loop from the cast-on.

The tips on a 16-inch circular are shorter than on longer needles, which can feel cramped at first. Hands adjust after a few rounds. If you have never used one, your first hat on circular needles starts from the cast-on, and the guide to joining in the round covers the one step that needs care.

Double-Pointed Needles

DPNs are short, straight needles with a point at each end, sold in sets of four or five. The stitches are divided over three or four needles arranged in a triangle or square, and the spare needle does the knitting. When it has emptied a needle, that needle becomes the new spare.

To move a crown from the circular needle to DPNs, simply knit the next round onto them: about a third of the stitches onto each of three needles. Try to split the stitches at the boundaries between decrease sections, so that no k2tog straddles two needles.

For hats, DPNs of 6 to 8 in (15 to 20 cm) are a practical length. Shorter ones are nimble with fine yarn; thick yarn needs the longer ones so the stitches do not fall off.

Magic Loop on a Long Circular

Magic loop uses one long circular needle with a soft, flexible cable. The stitches are split into two halves, and the extra cable is pulled out between them in a loop on each side. You knit the front half with the two tips, turn the work, slide the cable so the other half sits on a tip, and knit that half.

Because the loops absorb the extra length, the same needle works for 88 stitches or for the final 8. A knitter who owns one 32-inch circular in the right size can make a complete hat with nothing else. A stiff cable fights back, so choose one that bends easily.

Which crown method should a beginner choose?

Either works, and neither is more “correct”. DPNs are easier to understand at a glance and cost little to try. Magic loop has fewer points to poke out and fewer needles to drop. If the crown is the part you are nervous about, read through how crown decreases work first; the knitting itself is the same on both.

What About Straight Needles?

Straight needles cannot knit a tube, but they can knit a hat. The piece is worked flat and sewn up the back, as in the easy flat-knit hat on straight needles. A flat hat needs no DPNs at all, because the crown rows simply get shorter.

Choosing the Needle Size

Needle size means the thickness of the needle, and it is matched to the yarn weight. The pairs below are common starting points for hats. The middle column is for the hat body; the brim is usually worked on a needle about 0.5 to 1 mm thinner so the ribbing grips.

Yarn weight	Body needle	Brim needle	Typical gauge over 4 in (10 cm)
DK (3)	US 6 (4 mm)	US 4 (3.5 mm)	22 stitches
Worsted (4)	US 8 (5 mm)	US 6 (4 mm)	18 stitches
Bulky (5)	US 10.5 (6.5 mm)	US 9 (5.5 mm)	14 stitches
Super bulky (6)	US 13 (9 mm)	US 11 (8 mm)	10 stitches

US numbers and metric sizes do not line up neatly, so check both on the package; the Craft Yarn Council needle size chart lists the equivalents. Yarn weights and their numbers are set out in the council’s standard yarn weight system.

Needle Materials

• Bamboo and wood have a slightly grippy surface. Stitches stay where they are put, which helps on DPNs and with slippery yarn. They are a comfortable first choice.
• Metal is smooth and fast, with sharper points. Stitches slide easily, sometimes too easily for a beginner holding four DPNs.
• Plastic and resin are light, which is pleasant in the large sizes used for super bulky yarn.

Your crown needles and your body needle must be the same thickness. They do not have to be the same material, although a switch from grippy to slick can change your tension a little.

A Sensible Starter Set

For a first adult hat in worsted weight yarn, this short list covers everything:

• One 16-inch circular needle, US 8 (5 mm), for the body
• One 16-inch circular needle, US 6 (4 mm), for the brim
• One set of US 8 (5 mm) double-pointed needles, or one 32-inch US 8 (5 mm) circular for magic loop
• A stitch marker and a tapestry needle

Knitters who would rather buy less can work the brim on the body needle. The brim will be slightly looser, but the hat will still fit.