How to Knit a Hat

Knitting a hat is one of the most rewarding beginner projects you can choose. It's small enough to finish quickly, practical enough to wear or gift, and the techniques you learn — casting on, knitting in the round, ribbing, and decreasing — form the foundation of almost every other knitting project you'll ever make.

This guide walks you through every stage, from choosing your yarn and needles to closing the crown and adding a pompom. Follow the steps in order and you'll have a finished hat in just a few sessions.

Choosing Your Yarn

For a first hat, worsted weight yarn (also called medium weight or weight 4) is the ideal choice. It's not too thin or too thick, works up at a manageable pace, and is easy to see your stitches. Most hats require between 100 and 200 yards. Popular options include:

• Caron Simply Soft 4-ply Worsted — smooth, easy to work with, wide colour range
• Patons Canadiana — classic, durable, great stitch definition
• Any medium weight (4) yarn listed on the label

Pro tip: Always save your ball band. It contains the fibre content, washing instructions, and dye lot number — all essential if you need to buy a second skein.

Choosing Your Needles

Hat knitting is done in the round, so you'll need circular needles — two needle tips joined by a flexible cable. For most worsted weight hats, use US size 8 (5.0 mm) or US size 9 (5.5 mm) needles, as recommended on your yarn label.

• 16" (40 cm) circular needle — ideal for adult hats
• 12" (30 cm) circular needle — for children's or baby hats
• Set of double-pointed needles (DPNs) — needed when the stitch count gets too small for circular needles during crown shaping

Pro tip: If you tend to knit tightly, go up one needle size. If your stitches are loose, go down one. Your gauge determines how your hat fits.

Understanding Gauge & Sizing

Gauge tells you how many stitches per inch your knitting produces. Before casting on, knit a small swatch and count the stitches. This matters more for hats than for scarves because a hat needs to stretch comfortably over your head.

For a good fit, knit your ribbing slightly smaller than your actual head circumference — this is called negative ease, and it's what keeps the hat snug. A common approach is to calculate 80–85% of your head circumference as your target ribbing measurement.

Note: Stitch counts above are approximate for k2p2 ribbing at 3 sts/inch with US size 10 (6 mm) needles and bulky yarn. Always check your own gauge.

What You'll Need

• Worsted weight yarn — 100–200 yards
• 16" circular needles in the size recommended on your yarn label (commonly US 8 or 9)
• Set of double-pointed needles (same size) for crown shaping
• Stitch marker (to mark the start of each round)
• Yarn needle (tapestry needle) for weaving in ends
• Scissors
• Measuring tape

Step-by-Step: Knitting Your Hat

Step 1:  Cast On

The long-tail cast-on is the recommended method for hats. It creates a firm, slightly elastic edge that sits neatly at the brim. To begin, pull out enough yarn for the cast-on tail — a safe estimate is about 1 inch of tail per stitch plus 6 extra inches. Make a slip knot and place it on your needle.

Drape both strands over your hand: the working yarn over your index finger, the tail over your thumb. Use the needle tip to scoop under the thumb loop, then over and through the index loop. Slide the thumb loop off to tighten the stitch. Repeat until you have the required number of stitches.

Pro tip: If you tend to cast on too tightly (a very common beginner habit), cast on using a needle one size larger than the one you'll use to knit. Then switch to your regular needle for the first row.

Step 2:  Join to Knit in the Round

Spread your cast-on stitches evenly around the needle. Before joining, check carefully that no stitches are twisted — this is the most common beginner mistake and can't be fixed later. All the stitches should sit with their bases below the needle, not wrapped around it.

Place a stitch marker on the right needle to mark the beginning of the round. To join, simply knit the first cast-on stitch, pulling the yarn snug to close the gap. You are now knitting in the round.

Pro tip: If joining confuses you, try knitting one or two flat rows first, then join. The small seam is easy to sew closed at the end and can be much easier for beginners.

Step 3:  Knit the Ribbing (Brim)

Ribbing creates the stretchy, fitted brim that holds the hat in place. There are two common options:

• K1P1 ribbing (knit 1, purl 1): the stretchiest combination — great for a snug fit
• K2P2 ribbing (knit 2, purl 2): slightly less stretchy but more visually appealing and very popular for hats

Continue the ribbing pattern for 2–3 inches, depending on your preferred brim depth. A deeper brim can be folded up for a classic beanie look.

Pro tip: If your finished ribbing doesn't stretch enough to fit over your head comfortably, it will be too tight to wear. Try your work on as you go by slipping the stitches onto a length of spare yarn and stretching it gently around your head.

Step 4:  Knit the Crown Body

Once your ribbing is complete, switch to stockinette stitch: knit every stitch, every round. This is the main body of the hat. The crown body should measure from the start of the ribbing (not from the cast-on edge) to your needles — so ribbing height counts toward your total length.

Measure the total length you need based on your hat size:

Stop adding length when you're about 1–1.5 inches shy of your target — that space will be used by the crown decreases.

Pro tip: Try the hat on before beginning your decreases. Slip the stitches onto a long piece of spare yarn, pull it snug, and place it on your head. This is the best way to judge if you need more or fewer rounds.

Step 5:  Shape the Crown (Decreasing)

Decreasing narrows the top of the hat to close it neatly. The most common approach is to divide your stitches into equal groups and work a k2tog (knit two together) decrease at the end of each group every other round.

A practical formula: choose a number that divides evenly into your stitch count (6 and 8 are common). That becomes your number of decrease points. For example, with 72 stitches and 6 decrease points: knit 10, k2tog, repeat 6 times around.

Continue decreasing every other round, reducing the stitch count between each k2tog by one each time (knit 9, k2tog → knit 8, k2tog → and so on). When you have too few stitches to comfortably work on circular needles, switch to double-pointed needles.

Keep decreasing until you have 6–8 stitches remaining.

Pro tip: More decrease points (e.g. 8 or 9) create a rounder, more domed crown. Fewer decrease points (4 or 5) create a flatter top. Choose based on the style you want.

Step 6:  Close the Top

Cut the yarn, leaving a tail of about 8 inches. Thread the tail onto your yarn needle. Slip the remaining stitches off the knitting needle one by one, threading the yarn needle through each stitch as you go. Pull the yarn snug to draw the crown closed, then pass the needle through to the inside of the hat.

Weave in this end securely on the wrong side by running it through several stitches in different directions. Trim any excess.

Step 7:  Weave in All Ends & Finish

Thread your yarn needle with the cast-on tail and weave it through the stitches at the brim on the wrong side. Weave at least 2–3 cm in two directions to prevent unravelling, then trim.

Give your hat a gentle steam block or hand-wash if needed to even out the stitches and set the shape. Lay flat to dry.

Optional: Adding a Pompom

A pompom is a classic finishing touch. You can make one from your remaining yarn, use faux fur, or attach a store-bought pompom.

How to Attach a Pompom

1. Make or purchase your pompom.
2. Cut two lengths of yarn about 12" long and thread both through the centre of the pompom.
3. Insert your yarn needle down through the top of the hat to the inside.
4. Tie the two yarn ends securely in a double knot on the inside of the hat.
5. Trim the ends and weave them in.

Pro tip: Sewing through the top of the hat a second time in a perpendicular direction before knotting will make the pompom much more secure — it'll survive washing and enthusiastic wearing.

Quick Reference: Common Mistakes & Fixes