The Basic Method: Knit Two Together

Knit two together (often written as K2tog) is a decrease that combines two stitches into one. You insert your right needle through two stitches at once instead of one, then knit them as a single stitch. The result is one fewer stitch on your needle, and the two stitches lean to the right.

This is the most common decrease in knitting. You will use it to shape sleeves, necklines, and the crown of hats. It is straightforward once you understand the needle angle, and it works the same way whether you are working flat or in the round.

Key Takeaways

  • Knit two together by inserting your right needle through two stitches from left to right, then knitting them as one stitch.
  • The decrease leans to the right, which matters when you are shaping symmetrical pieces like armholes or necklines.
  • You can work K2tog on any row or round, and it counts as one stitch in your stitch count after you complete it.
  • If you need a left-leaning decrease instead, use slip, slip, knit (SSK) or purl two together through the back loop (P2tog tbl).

Step-by-Step: Knit Two Together on a Knit Row

Start with your working yarn in the back, as you would for a normal knit stitch. Bring your right needle to the front of your work, between the two stitches you want to decrease.

Insert the right needle through the first stitch on the left needle from left to right, then through the second stitch the same way. Both stitches should now be on your right needle. Wrap your working yarn around the right needle as you would for a regular knit stitch, and pull the loop through both stitches at once. Slip the two original stitches off the left needle. You now have one new stitch on the right needle instead of two.

The key difference from a regular knit stitch is that you go through two stitches instead of one. The motion is identical after that.

Knit Two Together on a Purl Row

On a purl row, the setup is the same but the yarn starts in front. Insert your right needle through two stitches from right to left (the purl direction), wrap the yarn, and pull through both stitches at once. This is called purl two together (P2tog).

P2tog also leans to the right, just like K2tog does. If you are working stockinette stitch (knit on the right side, purl on the wrong side) and you want matching decreases on both sides of a neckline, you will pair K2tog on the knit rows with SSK on the knit rows, not with P2tog.

Why the Lean Direction Matters

K2tog leans to the right because the right needle passes through the stitches from left to right. This means the left stitch ends up on top of the right stitch in the finished fabric. When you shape a neckline or armhole, you usually want the decreases to lean toward the center of the piece, which creates a balanced look.

On the right side of a neckline, you would use K2tog (right-leaning). On the left side, you would use SSK or another left-leaning decrease so both sides mirror each other. Patterns will tell you which decrease to use and where.

Common Mistakes and How to Avoid Them

The most frequent error is inserting the needle through only one stitch by accident. Check that both stitches are actually on your right needle before you wrap the yarn. If you wrap and pull through and only one stitch comes off the left needle, you have made a yarn over instead of a decrease.

Another mistake is working too tightly. Decreases can pinch if you pull the yarn too hard on the stitch after the decrease. Keep your tension even, the same as the rest of your row. The stitch will settle into place as you work the next few rows.

If your decreases look twisted or uneven, check that you are inserting the needle in the correct direction. K2tog goes left to right. If you go right to left, you are twisting the stitches, and they will look wrong.

When to Use K2tog Versus Other Decreases

K2tog is the default decrease for most patterns. Use it whenever the pattern says "decrease" without specifying which type. It is fast, reliable, and creates a clean right-leaning line.

Use slip, slip, knit (SSK) when you need a left-leaning decrease. Slip two stitches knitwise one at a time, insert the left needle through both from left to right, and knit them together. SSK is slightly more fiddly than K2tog but creates a mirror-image lean.

Use purl two together through the back loop (P2tog tbl) on purl rows when you need a left-leaning decrease. This is less common but appears in some patterns, especially for symmetric shaping on the wrong side of the fabric.

Practicing the Motion

If you are new to decreases, practice on a swatch before you work them into a project. Cast on 20 stitches and knit a few rows in stockinette. On the next knit row, knit 5 stitches, then K2tog, knit 8, K2tog, knit 5. You should now have 18 stitches. Knit another row, then repeat the decrease row. This gives you a chance to feel the motion without worrying about a finished piece.

Once the motion feels natural, you can work decreases at full speed. Most knitters develop a rhythm where the decrease flows as smoothly as a regular stitch.

Frequently Asked Questions

Can I knit two together on the first stitch of a row?

Yes. K2tog works the same way whether it is the first stitch, the last stitch, or anywhere in between. Some patterns ask you to knit one stitch, then K2tog, to create a neat edge on shaped pieces like sleeves.

What if I accidentally knit two together when the pattern said to knit one?

You have one fewer stitch than you should. You can drop back and fix it with a crochet hook if you notice right away, or you can add a yarn over later to bring your stitch count back up. If you do not notice until several rows later, it is usually easier to keep going and adjust your next decrease row.

Does knit two together work the same in the round as it does flat?

Yes, the stitch itself is identical. The only difference is that you are always working on the right side of the fabric, so you never use P2tog in the round unless the pattern specifically calls for it.

Why does my K2tog look loose compared to the other stitches?

The stitch after a decrease often looks slightly larger because you are pulling yarn through two stitches instead of one. This evens out after a few rows. If it still looks loose after blocking, you may be pulling too hard on that stitch — try loosening your tension slightly on the stitch when ready after the decrease.