Mastering The Kfb: How To Knit Front And Back With Flawless Tension

To execute the knit front and back (kfb) increase, insert your right-hand needle into the front loop of the next stitch on your left-hand needle, wrap the yarn, and pull a loop through without dropping the stitch. Next, swing the right needle to the back and insert it down into the back loop of that same active stitch, wrap the yarn, pull a loop through, and slide the completed double stitch off the left needle. This precise maneuver transforms one stitch into two, creating a clean knit stitch paired with a small, structural horizontal bar on your fabric.

Essential Tools and Prerequisite Skills for Kfb Increases

Before integrating the knit front and back increase into a live project like a raglan sweater, shawl, or sleeve cap, you must prepare your knitting environment and select the correct materials. The kfb is a highly versatile increase, but its appearance is heavily influenced by your tension, needle material, and the twist characteristics of your yarn.

Required Materials and Technical Benchmarks

To practice this technique and achieve consistent gauge-matching results, assemble the following tools and meet these minimum skill requirements:

• Knitting Needles: A pair of needles suited to your yarn weight. Sharp, tapered tips (often marketed as "lace tips") are highly recommended because they easily slip into the tight back loop of the stitch during the second phase of the increase. Metal needles offer the slickest transition, while bamboo or wooden needles provide extra grip if your yarn is slippery.
• Yarn Selection: A smooth, multi-ply medium weight yarn (such as worsted weight wool or acrylic) is ideal for learning. Highly textured yarns, single-ply wools, or boucle yarns can easily split during the back-loop entry.
• Stitch Markers: Standard plastic ring or locking stitch markers to isolate the increase points along your row.
• Prerequisite Skills: You must be comfortable with the standard knit stitch (continental or English style), understand basic stitch anatomy (identifying the front leg versus the back leg of a loop), and maintain a stable working gauge.
• Time and Budget Benchmarks: Mastering the physical mechanics takes roughly 15 to 30 minutes of dedicated practice swatching. A basic set of practice yarn and needles costs between $10 and $25.

Executing the Knit Front and Back Increase: A Step-by-Step Walkthrough

The kfb is often called a "bar increase" because the second half of the stitch creates a small horizontal bar that resembles a purl stitch. Mastering this technique requires smooth coordination of your hands to avoid stretching the base loop. Follow these steps to achieve perfect tension.

Step 1: Insert Into the Front Loop

Begin your row by working in pattern up to the point where your instructions call for a kfb. Identify the first active stitch on your left-hand needle.

Insert the tip of your right-hand needle from left to right through the front loop of this stitch, exactly as you would for a standard knit stitch. The right needle should sit behind the left needle once inserted.

Wrap your working yarn counter-clockwise around the tip of the right-hand needle. Draw this loop through the stitch to the front, creating a new loop on your right-hand needle.

Warning: Do not slide the original stitch off the left-hand needle yet. Sliding the stitch off at this stage will drop the loop, destroying the stitch and causing your work to unravel down the column. Keep the active loop securely anchored on the left needle barrel.

Step 2: Pivot the Right Needle to the Back

With the original loop still resting on the left-hand needle and the newly formed loop resting on the right-hand needle, you must now reposition your hands to access the back portion of the active stitch.

Gently pivot the tip of your right-hand needle around the back of the left-hand needle. Locate the back loop (often called the back leg or trailing leg) of the same stitch you just worked on the left needle.

Insert the tip of your right-hand needle from right to left down into this back loop. The right needle tip will now point down and away from you, crossing behind the left needle.

Pro-Tip: If the back loop feels too tight to enter, use the index finger of your left hand to press gently upward on the bottom of the left needle. This pushes the loop slightly off the needle barrel, opening up the space between the front and back legs.

Step 3: Wrap and Draw Through the Back Loop

With your right needle tip resting inside the back loop of the active stitch, prepare to create the second half of the increase.

Wrap your working yarn counter-clockwise around the tip of the right-hand needle. Carefully pull this loop through the back loop of the stitch, drawing it out to the right.

You should now have two distinct loops sitting on your right-hand needle. The front loop will look like a flat, standard knit stitch, while the second loop will feature a small horizontal collar of yarn wrapped around its base.

Step 4: Release the Original Stitch

To finalize the knit front and back increase, you must release the worked loop from your left needle.

Gently slide the original stitch off the tip of your left-hand needle. Give your working yarn a light, uniform tug to settle both new stitches onto the barrel of your right-hand needle.

Verify your work. You have successfully increased your stitch count by one. The left stitch of the pair will display a small horizontal bar at its base, which is the signature visual marker of the kfb.

Comparing Standard Knitting Increase Techniques

Different knitting projects call for different structural properties. While the kfb is incredibly robust and easy to execute, other increases offer cleaner, invisible profiles. Use the table below to determine the best increase method for your specific design goals.

Diagnosing and Correcting Common Kfb Mistakes

While the knit front and back increase is mechanically straightforward, variations in tension and needle angle can lead to structural flaws. Here are the most common issues knitters experience and how to fix them immediately.

The "Gapping Hole" Beneath the Bar

• Root Cause: This issue occurs when you pull your right-hand needle too far away from the left-hand needle during the transition in Step 2. Pulling the needle stretches the base loop, pulling excess yarn from the row below and creating a permanent gap or hole in your fabric.
• Actionable Fix: Keep your needle tips close together. When pivoting the right needle around to the back of the left needle, execute the movement right at the tips of the needles where the diameter is smallest. Do not pull outward on the working yarn until the entire increase is finished and slipped off the left needle.

Splitting the Yarn Plies

• Root Cause: This error typically happens during Step 2 when inserting the right needle into the back loop. If your needle tip is blunt or if you enter at an incorrect angle, the needle will pierce the middle of the yarn strand rather than passing cleanly through the center of the loop. This weakens the yarn and leaves an unsightly frayed strand on the front of your work.
• Actionable Fix: Switch to a needle with sharp, tapered tips. If you feel resistance when entering the back loop, back the needle out, gently nudge the stitch with your fingertip to untwist it, and ensure your needle tip slides cleanly into the open space behind the left needle.

Excessively Tight Second Stitches

• Root Cause: If you pull the working yarn too tightly after completing the first knit stitch in Step 1, you will clamp down on the back loop of that same stitch. This makes inserting the right needle in Step 2 incredibly difficult and can twist your gauge out of alignment.
• Actionable Fix: Maintain a relaxed, consistent hold on your yarn. Ensure that the loop created in Step 1 is slid onto the widest part (the barrel) of your right needle before attempting to insert into the back loop. This naturally sizes the stitch to match your needle gauge, leaving plenty of slack to work the back loop.

Accidental Dropped Stitches During the Pivot

• Root Cause: As you pivot the right needle to locate the back loop, the original stitch can easily slip off the tapered tip of the left needle before you have completed the second loop.
• Actionable Fix: Secure the active stitches on your left needle using the index finger of your left hand. Place your fingertip lightly over the loop on the left needle as you swing your right needle to the back. This physical barrier prevents the stitch from sliding off prematurely.

Frequently Asked Questions

Does a kfb count as one or two stitches when reading a knitting pattern?

A kfb increase consumes one existing stitch from your left-hand needle and produces two new stitches on your right-hand needle. Therefore, when counting your stitches at the end of a row, each completed kfb contributes two stitches to your total count, yielding a net gain of one stitch.

Can I use the kfb increase on a purl row?

Yes, you can work a similar increase on a purl row, which is abbreviated as pfb (purl front and back). To execute it, purl into the front loop of the stitch as normal, leave the stitch on the needle, swing your needle to the back to purl into the back loop of that same stitch, and then slide it off.

Is there a way to make the kfb increase invisible?

The kfb is inherently visible due to the horizontal bar created by twisting the back loop. If you require a completely invisible increase, you should use a Make One Left (M1L) or Make One Right (M1R) increase instead, which raises and twists the horizontal strand of yarn between two stitches.

Why is my kfb bar looser on some rows than others?

Inconsistent bar size is almost always caused by uneven tension during the pivot phase. If you tension your working yarn differently when knitting into the front versus the back loop, one half of the stitch will steal yarn from the other, resulting in uneven, sloppy loops across your fabric.

Elevate Your Craft with Master-Level Knitting Techniques

Now that you have mastered the physical mechanics and structural adjustments of the knit front and back increase, you are ready to tackle complex garment shaping with absolute confidence. Consistent practice on small gauge swatches will train your muscle memory, ensuring that every increase you work remains perfectly neat, tight, and professional.