Pick Up Stitches Along the Armhole Edge

To add sleeves to a sweater body, you pick up stitches along the armhole opening—the edge where the sleeve will attach. You do this by inserting your needle through the fabric edge and pulling yarn through to create new loops. The goal is to pick up roughly one stitch for every row-end stitch along the armhole, though the exact count depends on your pattern and the yarn weight you are using.

Start at the underarm corner where the body meets the armhole. Use a needle one or two sizes smaller than your main needles, and use the same yarn you used for the body. Insert the needle from front to back, one stitch in from the edge, then wrap the working yarn around the needle and pull it through to the front. You now have one new stitch on your needle. Move up the armhole edge and repeat this motion along the entire opening until you reach the opposite underarm corner.

Key Takeaways

  • Pick up stitches by inserting your needle through the armhole edge and pulling yarn through to create new loops on your needle.
  • Aim to pick up roughly one stitch per row-end stitch along the armhole, but your pattern will tell you the exact number to pick up.
  • Use a needle one or two sizes smaller than your main needles to keep picked-up stitches tight and prevent gaps at the armhole.
  • Work your first round or row after picking up stitches in the same stitch pattern as the body to blend the sleeve smoothly into the armhole.

Count the Rows and Plan Your Pickup

Before you pick up a single stitch, count the rows along one armhole edge. This tells you how many stitches you need to pick up. If your armhole is 40 rows tall, you will pick up roughly 40 stitches—though this varies based on your stitch pattern and yarn. Stockinette stitch (knit on the right side, purl on the wrong side) typically uses a one-to-one ratio: one picked-up stitch per row-end stitch.

Your pattern will specify exactly how many stitches to pick up. If it says "pick up 36 stitches," that is your target. If your armhole is 40 rows but the pattern calls for 36 stitches, you will skip some rows as you go up the edge. A straightforward way to space them evenly is to divide the total rows by the number of stitches you need to pick up, then pick up a stitch at regular intervals. For example, if you have 40 rows and need 36 stitches, pick up a stitch roughly every 1.1 rows.

Work the First Round or Row After Pickup

Once you have picked up all your stitches, you are ready to knit the sleeve. If you are working in the round (the most common method for sleeves), join to the beginning of the round and knit the first round in stockinette stitch or whatever stitch pattern matches your body. This first round is crucial: it locks the picked-up stitches in place and prevents gaps from forming between the armhole and the sleeve.

If your pattern calls for ribbing at the cuff, do not start ribbing when ready. Knit at least one full round in stockinette first, then switch to ribbing. This gives the picked-up stitches time to settle and prevents the ribbing from pulling the armhole too tight. After that first round, you can begin decreasing stitches if your pattern requires it, or continue straight up the sleeve depending on the design.

Avoid Common Gaps and Loose Stitches

The most common mistake is picking up stitches too loosely, which creates visible holes along the armhole. To prevent this, keep tension consistent as you pull the yarn through each stitch. The picked-up stitches should be snug but not so tight that they distort the armhole edge. If you find your tension is naturally loose, use a needle one size smaller for picking up, then switch to your regular needle size for the first round.

Another frequent problem is picking up stitches too far from the edge. If you insert your needle more than one stitch in from the edge, you create a gap between the body and the sleeve. Always pick up one stitch in from the very edge. Also avoid picking up stitches in the cast-off row itself—start one row below the cast-off edge and work your way up.

Pick Up Stitches on Different Armhole Shapes

Straight armholes are the easiest: you straightforward pick up stitches along a vertical line. Curved armholes (like those on a fitted garment) require slightly more care. As you approach the curve, you may need to pick up two stitches from the same row in the tightest part of the curve to avoid puckering. Your pattern will usually note where these double pickups occur.

For drop-shoulder designs, the armhole is often a straightforward horizontal line, and you pick up stitches along that line just as you would a straight armhole. For cap sleeves or other variations, follow your pattern's instructions for where to begin and end your pickup. The principle remains the same: insert the needle through the edge, pull yarn through, and move to the next position.

Adjust Stitch Count if Your Armhole Does Not Match the Pattern

Sometimes your armhole is slightly larger or smaller than the pattern assumes, especially if you modified the body length or changed yarn. If your armhole is 2 or 3 stitches off from what the pattern calls for, pick up the number your armhole actually needs rather than forcing the pattern number. A sleeve that is 2 stitches wider will not ruin the fit.

If the difference is larger—say, 5 or more stitches—you have two options. You can pick up the actual number and adjust your decreases as you knit the sleeve to reach the correct cap width. Or you can pick up the pattern number and accept that the armhole will be slightly snug. Most knitters choose the first option because it preserves the overall fit of the garment.

Frequently Asked Questions

Should I pick up stitches on the right side or wrong side of the fabric?

Always pick up from the right side (the side that faces outward). Insert your needle from front to back so the working yarn is on the wrong side as you pull it through. This keeps the picked-up stitches neat and visible on the outside of the garment.

What if I pick up too many or too few stitches?

If you pick up too many, the sleeve will be too wide at the armhole and may bunch. If you pick up too few, the armhole will be tight and uncomfortable. If you notice the error before you knit the first round, rip back and pick up again. If you discover it after a few rounds, you can decrease extra stitches in the first round or two to correct the count.

Can I pick up stitches with the same needle size I used for the body?

You can, but using a needle one or two sizes smaller keeps the picked-up stitches tighter and prevents gaps. After you pick up all the stitches, switch to your regular needle size for the first round. This two-needle method is standard practice and takes only a moment.

Do I need to pick up stitches differently for circular needles versus straight needles?

The picking-up motion is identical. The difference is what you do after: with circular needles, you join to the beginning of the round and knit in the round. With straight needles, you work back and forth in rows. The actual pickup technique does not change.

What if my armhole edge is very curved or shaped?

Follow your pattern closely for curved armholes. You may pick up two stitches from the same row in the tightest curves to avoid puckering, and you might skip a row in gentler curves. Your pattern will specify where these adjustments occur. If you are working without a pattern, pick up roughly one stitch per row and adjust as needed in the first round if the sleeve cap does not sit smoothly.