The KFB is a basic increase used in tons of patterns.
This increase creates a little bump that looks like a purl bump.
The bump can actually be used as a decorative element in a pattern.
How to work a KFB (Knit Front and Back) stitch
Step 1: Knit into the front of the stitch (just like normal). But. DO NOT slip the stitch off the left needle.
Instead, work Step 2.
Step 2: Knit into the back of the same stitch.
This is the same action you would do if you were KTBLing.
NOW, slip the stitch off the left needle.
It’s often called a “bar increase” because, well, there’s a small bar that’s left behind. Technically, it’s from working the second part of the stitch (the KTBL part).
When working them in pairs, I work them so the bar part is in the same place for each side. Since the bar is created by the second part of the stitch, this means that I’ll often place them so the bars are in the same place for each stitch.
Here’s how I do it when working then for raglan increases.
In this example. I’ve marked just the center stitch. I work up until the marker, KFB, k1, KFB. This actually makes the bars TWO stitches apart.
Notice that they’re TWO stitches apart, even though I only work a single knit stitch between the two.
The same approach works for the toes of socks as well. In that case, I:
K1, kfb, work until TWO stitches rem, kfb, k1. This makes the bars 2 stitches from each edge.
Comparison of Increase Methods
Here I’ve pictured both the KFB and M1 methods side-by-side.
Try the KFB with some scrap yarn
Work up a swatch using the KFB so you can get comfortable with it!