What knitting through the back loop means and when to use it

Knitting through the back loop (TBL) means inserting your needle into the back of the stitch instead of the front, then working it as normal. The result is a twisted stitch that sits differently on your needle and creates a tighter, denser fabric with a subtle texture change.

You use this technique when a pattern calls for it by name, or when you want to tighten loose stitches, fix a twisted stitch from a previous row, or create intentional texture. Some patterns use it throughout for a specific look; others use it only in certain rows or sections. Always check your pattern instructions first, because working through the back loop when the pattern does not call for it will change how your finished piece looks and fits.

The most common reason a beginner encounters this technique is to fix stitches that have twisted on the needle. If you notice a stitch sitting backwards, working through the back loop on the next row corrects it.

Key Takeaways

  • Knitting through the back loop means inserting your needle into the rear of the stitch rather than the front, creating a twisted stitch that tightens the fabric.
  • The technique is abbreviated as TBL in patterns and produces a noticeably denser, textured result compared to standard knitting.
  • You insert the needle from right to left through the back loop, then knit or purl the stitch exactly as you normally would.
  • Working through the back loop unintentionally changes your fabric, so only use it when your pattern specifically calls for it or when you are deliberately fixing a twisted stitch.

How to identify the back loop on your needle

Each stitch on your needle has two loops: the front loop (closer to you) and the back loop (farther from you). When you look at your needle straight on, the front loop is the one you normally insert your needle through. The back loop sits behind it, slightly recessed.

If you are holding your needle at eye level and looking down the row, the back loop is the one that appears to be behind the front loop. It helps to tilt your needle slightly toward you so you can see both loops clearly. On a knit stitch, the back loop will look like a small V shape sitting behind the main V of the front loop.

Practice identifying both loops on a few stitches before you start working. Hold your needle up to a light source and move it slowly along the row. The depth difference between front and back becomes obvious once you know what to look for.

The step-by-step process for knit stitches

Hold your working yarn in your right hand (or left, depending on your method) the same way you do for a regular knit stitch. Insert your right needle from right to left through the back loop only of the stitch on your left needle. This is the key difference: instead of going through the front, you go through the back.

Once your needle is through the back loop, wrap your working yarn around the needle exactly as you would for a regular knit stitch. Pull the new loop through the back loop and slide the old stitch off your left needle. You now have a twisted knit stitch on your right needle.

The motion feels almost identical to a regular knit stitch once you have the needle in the right place. The only real difference is the entry point. If you find yourself struggling, slow down and double-check that your needle is actually going through the back loop before you wrap the yarn.

The step-by-step process for purl stitches

Hold your working yarn in front of your needles, the same position as a regular purl stitch. Insert your right needle from left to right through the back loop only of the stitch on your left needle. Because you are purling, the needle goes in from the opposite direction compared to a knit stitch, but it still goes through the back loop.

Wrap your working yarn around the needle the way you normally would for a purl stitch, then pull the new loop through and slide the old stitch off your left needle. A twisted purl stitch sits on your right needle.

Purling through the back loop feels less natural to most knitters than knitting through the back loop, straightforward because the angle is less familiar. Take your time and make sure the needle is fully through the back loop before you wrap. If your stitch feels tight or stuck, you may have caught part of the front loop as well.

Common mistakes and how to fix them

The most frequent error is catching both loops at once instead of just the back loop. This happens when you do not insert the needle far enough back or when you angle it slightly forward. The result is a stitch that does not look twisted at all. To avoid this, push your needle all the way through the back loop before you wrap the yarn, and keep the needle tip pointing slightly away from you as you insert it.

Another common problem is accidentally dropping the front loop while you work. If you see a hole or a loose stitch where you worked through the back loop, you likely let the front loop slip off the needle. Make sure both loops are sitting on your left needle before you insert your right needle, and do not move your left needle until the old stitch is completely off.

If your stitches are coming out too tight, you may be pulling the working yarn too hard after you wrap it. Twisted stitches are naturally tighter than regular stitches, but they should not be so tight that they are hard to work into on the next row. Ease up slightly on your tension and see if that helps.

When to use this technique in your projects

Check your pattern first. If it says "knit through back loop" or "purl through back loop" (or uses the abbreviation TBL), work that stitch or row using this technique. Some patterns use it for an entire project to create a denser fabric; others use it only on certain rows for a specific visual effect.

Outside of pattern instructions, use this technique to fix a twisted stitch from a previous row. If you notice a stitch sitting backwards on your needle, work through the back loop on the next row to correct it. This is one of the most practical uses for a beginner.

You can also use it intentionally to tighten loose stitches in areas where your tension tends to be uneven, such as after a yarn over or in the first few rows of a project. However, do this sparingly and only if your pattern does not forbid it, because it changes the appearance of your fabric.

How twisted stitches look and feel in finished fabric

Stitches worked through the back loop create a noticeably tighter, denser fabric compared to regular stitches. The texture is slightly raised and has a subtle spiral or twist to it. If you work an entire project through the back loop, the finished piece will be stiffer and less drape-y than the same pattern worked normally.

In a pattern that uses TBL selectively, the twisted rows or sections stand out visually. They often appear darker or more defined than the surrounding fabric. This is intentional in many patterns and creates a decorative effect or adds structure to a specific area, such as a ribbed cuff or a textured border.

The twisted stitch also sits differently on your needle, which can take some getting used to. When you work into a twisted stitch on the next row, the loop orientation is reversed, so pay attention to which loop you are entering.

Frequently Asked Questions

What does TBL mean in a knitting pattern?

TBL is the abbreviation for "through back loop". When you see "K1 TBL" or "P2 TBL" in a pattern, it means knit or purl that stitch or those stitches by inserting your needle through the back loop instead of the front.

Will knitting through the back loop make my stitches too tight?

Twisted stitches are naturally tighter than regular stitches, but they should not be so tight that you cannot work into them on the next row. If your tension is very tight to begin with, this technique may make it worse. Practice on a swatch first to see how it affects your fabric.

Can I use this technique on every stitch?

Yes, you can work an entire project through the back loop if you want to, and some patterns are designed this way. However, it changes the look and feel of your fabric significantly, so only do this if your pattern calls for it or if you are deliberately experimenting.

What if I accidentally work through the back loop when I should not?

If you work through the back loop on a stitch where the pattern does not call for it, you will have one twisted stitch among regular stitches. It will be noticeable. You can either frog back to that point and redo it, or leave it if it is not too obvious. For future rows, just go back to working through the front loop normally.

How do I know if I am going through the back loop correctly?

The stitch on your needle should look visibly twisted or rotated compared to the stitches around it. If it looks the same as a regular stitch, you probably went through both loops or the front loop only. Slow down and check your needle placement before you wrap the yarn.