Knitting Sleeve Increases in the Round

The exact count, placement, and interval come from your pattern’s sleeve-shaping instruction. When you knit a sleeve in the round, you usually add one stitch on each side of the underarm area so the sleeve widens gradually from cuff to upper arm. The key is to use the increase method your pattern names, place it consistently, and keep an accurate round count.

What Sleeve Increases Do

Sleeve increases create a tapered sleeve: narrow at the cuff and wider at the upper arm. In a bottom-up sleeve, you begin with fewer stitches, work increase rounds as directed, and stop increasing when you reach the stitch count needed for the upper arm.

An increase round is different from simply adding stitches wherever the sleeve feels tight. Its placement affects the shape of the sleeve, the look of the fabric, and whether stitch patterns stay centered.

Patterns do not use every increase term interchangeably. The Utah State University Extension knitting handbook distinguishes among Knit Increases, Increasing 1 Stitch, Eyelet Increase or Yarn Overs, and Make 1 Stitch. Read the abbreviation key before beginning, especially if the pattern uses an unfamiliar term.

A sleeve pattern may tell you to:

“Increase 1 stitch each side of marker”
“Work M1L, knit to last stitch, M1R”
“Kfb at each edge”
“Increase in pattern”
“Increase every specified number of rounds”

The method, location, and timing all matter. Use the increase method named in your pattern.

How to Work Sleeve Increases in the Round

Use this chart to identify what your pattern is asking for before you start the shaping round.

Pattern Wording	What It Means	Where the New Stitch Comes From
KFB or K1FB	Knit into the front and back of one stitch	One existing stitch becomes two
M1, M1L, or M1R	Make a stitch, often with a left- or right-leaning direction	The horizontal strand between two stitches
Eyelet Increase or Yarn Over	A decorative increase that leaves a hole	Yarn wrapped over the needle
Knit Increases or Increasing 1 Stitch	A general instruction that needs the pattern’s definition	Depends on the pattern key

Step 1: Read the Entire Sleeve-Shaping Instruction

Before working the first increase round, identify four things:

The named increase method.
The two locations where increases belong.
The rounds on which increases occur.
The final stitch count or point at which the pattern tells you to stop increasing.

Put a removable marker at the beginning of the round, usually at the underarm. If your sleeve has cables, lace, colorwork, or a centered texture panel, add markers around that panel too. Those markers help you keep the sleeve design centered while the plain side sections grow.

Step 2: Mark the Increase Positions

Most plain sleeves use paired increases near the underarm. One increase is worked shortly after the beginning-of-round marker and the other shortly before it.

For a simple self-designed stockinette sleeve, you can:

Work the first stitch after the beginning-of-round marker.
Make the first increase.
Knit around until one stitch remains before the marker.
Make the second increase.
Knit the final stitch and slip the marker.

This produces a balanced widening line. If your pattern gives different placement instructions, such as increases beside a cable panel, use the pattern’s positions instead.

Step 3: Work the Increase Your Pattern Names

Use the exact method called for in the pattern.

To work KFB:

Knit into the front of the next stitch, but leave the stitch on the left needle.
Knit into the back loop of that same stitch.
Slide the original stitch off the needle.

KFB is straightforward and secure, but it leaves a small horizontal bump. It works well in casual stockinette sleeves and textured garments where that detail will not stand out.

To work M1L:

Lift the horizontal strand between the last stitch worked and the next stitch from front to back.
Knit through the back loop of that lifted strand.

To work M1R:

Lift the horizontal strand from back to front.
Knit through the front loop of that lifted strand.

M1 increases are usually less noticeable than KFB increases. The left- and right-leaning versions are often paired so the shaping looks balanced.

To work a yarn over:

Bring the yarn forward between the needles as if to purl.
Take the yarn over the top of the right needle.
Knit the next stitch.

A yarn over creates an eyelet. Use it only when the pattern calls for an Eyelet Increase or Yarn Over; it is decorative rather than invisible.

Step 4: Recount the Stitches Before Continuing

Count your stitches immediately after every increase round. If the instruction calls for a paired increase round that adds +2 stitches, your new count should equal the old count plus two.

KFB is worked into an existing stitch, whereas M1 is made between stitches; work the remaining stitches from the new count.

With KFB, the original stitch has become two stitches, so do not count it again as though it were still a separate unworked stitch. With M1, the lifted bar is the new stitch; knit it once and continue with the next original stitch.

Finding an extra or missing stitch several inches later is much harder.

Step 5: Knit the Plain Rounds and Repeat on Schedule

Use a row counter, tally marks, or a note in your pattern to track shaping rounds. Follow your sleeve instruction’s schedule for increase rounds.

Step 6: Stop Increasing at the Pattern’s Target

Stop increasing when you reach the stitch count or point named in the pattern, then work even or continue with the next sleeve instructions. Continue with any plain sleeve length, upper-arm shaping, cuff, or joining instructions that follow.

Before moving on, inspect the underarm area.

Using Circular Needles or Double-Pointed Needles

The increase itself is the same whether you use a short circular needle, magic loop, two circular needles, or double-pointed needles. Your beginning-of-round marker, not the needle break, determines where the round begins.

With double-pointed needles, an underarm increase pair may fall near the first and last needles. That is fine. Finish the round before redistributing stitches between needles if the needles become unevenly loaded.

With magic loop, avoid treating the looped cable sections as shaping markers. Keep a separate beginning-of-round marker in the knitting, and use additional locking markers for cable or colorwork boundaries.

If an increase falls exactly at the end of one needle, complete the stitch before shifting to the next needle. Do not move an unworked stitch simply to make the increase feel more convenient; that can shift the shaping line.

Working Increases in Patterned Sleeves

Patterned sleeve increases belong where they preserve rib columns, cable boundaries, and lace stitch balance.

Ribbed Sleeves

In ribbing, new stitches need to join the established knit-and-purl columns. A random KFB can interrupt the rib sequence, so follow the pattern’s instruction for whether the increase should be knitwise or purlwise.

If you are designing the sleeve yourself, place increases in a less conspicuous side section rather than inside a prominent rib column. Keep checking that the added stitches can settle into the intended rib pattern as the sleeve widens.

Cable and Texture Panels

Keep cable panels centered by placing increases outside their marked boundaries unless the pattern specifically tells you otherwise. In one cable-sleeve example, paired increases are worked on both sides of the cable pattern at rounds 6 and 12.

The example illustrates placement around a cable panel. Motif boundaries affect increase placement.

Lace and Eyelet Patterns

Lace often balances yarn overs with decreases to preserve the stitch count. A sleeve increase added inside a lace repeat can disrupt that balance.

Look for a designated side panel, stockinette section, or shaping column. If the pattern says to “increase in pattern,” make sure the new stitch is incorporated into the lace repeat exactly as instructed rather than added as an unrelated plain stitch.

Picked-Up, Top-Down, and Set-In Sleeve Shaping

A cuff-up sleeve normally needs increases because it grows from a narrow cuff toward a wider upper arm. A sleeve knit downward from an armhole usually starts wider and may need decreases as it approaches the cuff.

This matters when you pick up stitches around an armhole. A pattern may tell you to decrease at regular intervals even if another sleeve pattern uses increases at a similar interval. The garment construction, not a universal sleeve rule, decides which shaping direction you need.

A traditional set-in sleeve also has a sleeve cap shaped to fit the armhole. Many patterns knit the lower sleeve in the round, then divide the work and shape the cap flat. Others use short rows or a different construction method. Follow the sleeve-cap instructions separately from the lower-sleeve increases; they solve different fitting problems.

Check the Sleeve Before You Continue

Pause after a few shaping repeats and check the work while it is still easy to adjust.

Inspect the shaping for irregularities.
Check cable, lace, rib, or colorwork for disruptions.
Compare the sleeve width and length with the pattern schematic, using your own gauge.
Look for accidental eyelets, twisted Make 1 stitches, or an increase worked twice.

An unexpected hole beside an M1 usually means the lifted strand was knitted through the wrong loop. A hole where no eyelet belongs is worth fixing immediately, especially in smooth yarn where it will be noticeable.

Frequently Asked Questions

How Do I Do Sleeve Increases on Circular Needles?

Work the increase exactly as you would on straight needles, using a beginning-of-round marker to show the underarm position. A common layout places one increase just after that marker and a second just before it. The circular needle, magic loop, and double-pointed needles change how the stitches are held, not how the increase is formed.

Which Increase Is Best for Sleeves on Circular Needles?

Use the increase specified by the pattern. M1L and M1R are often chosen for smooth, subtle shaping, while KFB is easy to work but leaves a visible bar. Yarn overs are best when the sleeve design intentionally includes eyelets.

How Often Should I Increase a Knitted Sleeve?

One example sleeve increases every 6 rounds. Use the interval in your sleeve-shaping instruction, because gauge, sleeve length, stitch count, and garment style all affect how quickly the sleeve should widen.

How Can I Tell Whether I Added the Right Number of Stitches?

Count immediately after the shaping round. When the pattern calls for a paired increase of +2 stitches, the total should be exactly two higher than it was before the round. If the count is wrong, check the increase locations before knitting further.

Can I Knit a Set-In Sleeve in the Round?

You can often knit the lower portion in the round, but a classic set-in sleeve cap usually needs separate armhole shaping. The pattern may have you divide the sleeve and work the cap flat, use short rows, or follow another sleeve-cap construction. Keep the lower-sleeve increase instructions separate from the cap shaping.