A raglan sweater is built from the neck down in one piece, with increases that create diagonal seams from shoulder to underarm

A raglan sweater starts at the neckline and grows downward. You cast on stitches around the neck opening, then increase stitches at four fixed points — two on each side of the front and back — as you knit each round. These increases create the diagonal lines that run from your shoulder to your underarm, which is what makes a raglan a raglan. The body and sleeves are all one continuous piece until you bind off.

This construction method means you never have to seam the sweater together, and you can try it on as you work to check the fit. You also finish the sleeves last, so you can adjust their length without ripping back and starting over. Most raglan patterns use circular needles and work in the round, though some work flat and seam one side seam at the end.

Key Takeaways

  • A raglan sweater increases at four points (two front, two back) every few rounds to shape the sleeves and body simultaneously.
  • You cast on at the neck, work in rounds down the body, then divide the stitches to finish the sleeves separately.
  • Circular needles in the correct size for your yarn are essential, along with stitch markers to track your increase points.
  • Measuring your finished gauge (stitches and rows per inch) before you start determines whether your sweater will fit.
  • Most raglan patterns take 20 to 40 hours depending on yarn weight and your knitting speed.

Gather your yarn, needles, and pattern before you cast on

You need a knitting pattern written for a raglan sweater. Patterns are sold as printed booklets, PDF downloads, or free patterns on sites like Ravelry, PetiteKnit, or individual designer websites. Choose a pattern in your size — most patterns list finished bust measurements so you can pick the size that matches your desired fit, not your body measurement.

Buy the yarn weight and yardage the pattern calls for. A typical adult raglan in worsted weight needs 1,200 to 1,800 yards depending on size. Check the pattern's yardage range and buy slightly more than the minimum — leftover yarn is useful for seaming or repairs. You will also need circular needles in the size the pattern specifies (usually US 4 to 8 for worsted weight), stitch markers, a yarn needle for weaving in ends, and a measuring tape.

Read the entire pattern before you cast on. Highlight or note the increase rounds, the point where you divide for sleeves, and any special stitches or techniques. If the pattern uses a stitch you have not done before — like a yarn over or a lifted increase — practice it on scrap yarn first.

Knit a gauge swatch and measure it wet and dry

Gauge is the number of stitches and rows you knit per inch. If your gauge does not match the pattern's gauge, your sweater will be the wrong size. Cast on 20 to 24 stitches in the yarn and needles you plan to use, then knit in stockinette stitch (or the stitch pattern the sweater uses) for at least 4 inches. Bind off loosely.

Measure your swatch in three places across the width and three places down the height, then average those numbers. Count how many stitches and rows fall within a 4-inch span. If the pattern says "20 stitches = 4 inches" and you have 22 stitches in 4 inches, your gauge is too tight — you need larger needles. If you have 18 stitches in 4 inches, your gauge is too loose — you need smaller needles. Wet-block your swatch (soak it, squeeze out water, lay it flat to dry) and measure again, because many yarns change slightly when blocked.

Do not skip this step. A half-stitch difference per inch adds up to a sweater that is two sizes off by the time you reach the underarm.

Cast on at the neckline and place your stitch markers

Most raglan patterns tell you to cast on between 80 and 120 stitches around the neck opening using a long-tail cast-on or the method the pattern specifies. Use a circular needle at least 16 inches long so the stitches fit comfortably. Join to work in the round, being careful not to twist the cast-on.

Place stitch markers to divide your stitches into four sections: front, right sleeve, back, and left sleeve. The pattern will tell you how many stitches go in each section. For example, a pattern might say: cast on 100 stitches, place marker, knit 20 (right sleeve), place marker, knit 30 (back), place marker, knit 20 (left sleeve), place marker, knit 30 (front). The markers stay in place throughout the sweater so you know where to increase.

Knit a few rounds in ribbing (usually 1x1 or 2x2 rib) to create a stretchy neckband. The pattern specifies how many rounds — usually 6 to 10. This ribbing keeps the neckline from stretching out over time.

Increase at the raglan lines every few rounds until you reach the underarm

After you finish the ribbing, you begin the increase rounds. The pattern tells you how often to increase — usually every other round or every third round, depending on how steep the designer wants the raglan line to be. On an increase round, you add one stitch on each side of each marker. The most common method is a yarn over (which creates a decorative hole) or a lifted increase (which is invisible).

If the pattern says "increase round: knit to 1 stitch before marker, yarn over, slip marker, yarn over, knit to 1 stitch before next marker, yarn over, slip marker, yarn over," you repeat this sequence four times (once for each marker). This adds 8 stitches per increase round — 2 at each raglan line.

Continue increasing on the scheduled rounds until the pattern tells you to divide for the sleeves. This usually happens when the front and back sections have grown to roughly your shoulder width. You will knit 20 to 40 rounds of increases, depending on your size and the pattern's design. Try the sweater on every 10 rounds or so — it should fit loosely across the shoulders and chest.

Divide the stitches and knit the body and sleeves separately

When you reach the divide point, you cut the yarn and move the sleeve stitches to a holder (a spare circular needle, stitch holder, or even a piece of yarn threaded through the stitches). The pattern tells you exactly which stitches to move. Typically you move the right sleeve stitches to a holder, then the left sleeve stitches to another holder, leaving the front and back stitches on your working needle.

Rejoin the yarn at the underarm and knit the body in the round until it reaches your desired length — usually to the hip or just below. You do not increase anymore; you knit straight down. Try it on frequently to check the length. When the body is long enough, bind off all stitches.

Pick up the sleeve stitches from the holder and knit them in the round on smaller needles (the pattern specifies the size). Most sleeves taper slightly toward the wrist, so you decrease a few stitches every 10 to 15 rounds. Knit until the sleeve reaches your wrist, then bind off. Repeat for the second sleeve.

Weave in ends and block the finished sweater

Thread the yarn needle with each loose end and weave it through the bumps on the back of the stitches for about 2 inches, then trim. Do this for every end — the neckline cast-on, the bind-offs, and any color changes.

Wet-block the sweater to even out the stitches and set the shape. Fill a sink or basin with cool water and a small amount of wool wash (or gentle shampoo). Submerge the sweater for 15 to 20 minutes, then gently squeeze out the water without wringing. Lay it flat on a towel, smooth it to the correct measurements, and let it dry completely — usually 24 to 48 hours. Blocking makes a huge difference in how polished the finished sweater looks.

Frequently Asked Questions

What if my sweater is too big or too small after I finish?

If it is too big, you can wet-block it to a smaller size by pinning it to tighter measurements. If it is too small, blocking can stretch it slightly, but not much. The best fix is to measure your gauge carefully before you start the next sweater. If you made a gauge error, you now know what size needles to use next time.

Can I knit a raglan flat instead of in the round?

Yes. Some patterns are written to knit flat on straight needles, with increases on both sides of each raglan line. You seam one underarm and side seam at the end. Flat knitting takes longer because you have to purl every other row, but it works if you do not have circular needles or prefer flat knitting.

How do I adjust the sleeve length if the pattern is too long or short?

Measure from your shoulder bone to your wrist before you start. When you reach the divide and pick up the sleeve stitches, count how many rounds the pattern says to knit, then adjust. If the pattern says 60 rounds and you need 50, knit 50 instead. The sweater will still fit — you are just changing one measurement, not the overall construction.

What happens if I drop a stitch in the middle of the sweater?

Pick it up with a crochet hook as soon as you notice it. Insert the hook through the dropped loop from front to back, catch the horizontal strand above it, and pull the strand through the loop. Repeat for each row the stitch dropped. If you do not notice until several rows later, you may need to rip back to that point and reknit.

Do I have to use yarn overs for the raglan increases?

No. Yarn overs create a decorative line, but you can use a lifted increase or a make-one increase instead if you prefer an invisible seam. The pattern usually specifies which increase to use, but you can substitute as long as you increase by the same number of stitches on the same rounds.