How To Knit Front And Back: Master The Essential KFB Increase Technique

The knit front and back (kfb) technique is a foundational, visible increase used in knitting to turn one stitch into two without leaving large holes in the fabric. By working a standard knit stitch into the front loop and then an un-dropped knit stitch into the back loop of the same stitch, knitters achieve a balanced, reliable expansion.

Preparing Your Workspace and Materials for Success

Mastering the kfb increase requires understanding how tension, needle size, and yarn fiber interact to prevent unsightly bumps or ladders in your knitted fabric. Unlike yarn-over increases that create eyelets, the kfb creates a small horizontal bar reminiscent of a purl bump at the base of the new stitch. Choosing the right equipment ensures your stitches remain uniform and easy to manipulate.

• Essential Gear and Tools: A pair of straight or circular knitting needles matching your yarn weight, a practice swatch of smooth worsted-weight yarn (light colors help visibility), and tapestry needles for weaving ends.
• Mandatory Prerequisite Knowledge: Complete mastery of the standard knit stitch, the ability to read basic knitting charts or pattern instructions, and familiarity with working stitches through both front and back loops.
• Estimated Benchmarks: Practice swatching takes approximately fifteen to thirty minutes, with mastery of even tension achieved across a standard twenty-stitch repeat.

Step-by-Step Guide to Executing the Knit Front and Back Increase

Step 1: Identifying the Target Stitch and Inserting the Needle into the Front Loop

Work across your row in your established stitch pattern until you reach the specific stitch designated for the increase. Hold your working yarn in the back of the work as you would for a standard knit stitch. Insert your right-hand needle from front to back through the front leg of the next stitch on your left-hand needle.

Pro-Tip: Keep your working yarn tension relaxed but consistent. Pulling the yarn too tightly while inserting the needle distorts the stitch geometry and makes the subsequent back-loop entry difficult.

Step 2: Working the First Knit Stitch

Wrap the working yarn counter-clockwise around the right-hand needle, exactly as you would for a standard knit stitch. Draw the newly formed loop through the front leg of the stitch.

Warning: Do not slide the original stitch off the left-hand needle yet. The entire purpose of the kfb increase relies on keeping that original loop mounted on the left needle so you can work into it a second time.

Step 3: Repositioning the Needle for the Back Loop

With the first new stitch resting on your right needle and the original stitch still secured on your left needle, adjust your perspective. Gently maneuver the tip of your right-hand needle behind the left-hand needle. Insert the right needle from front to back through the back leg of that same original stitch on the left needle.

Step 4: Working the Second Knit Stitch and Completing the Increase

Wrap the working yarn counter-clockwise around the right needle once more. Pull this second loop through the back leg of the stitch. You now have two new stitches on your right needle originating from a single stitch below. Carefully slide the original stitch off the left-hand needle, allowing it to drop away safely as the two new loops are secured.

Technical Comparison of Common Knitting Increase Methods

Troubleshooting Common Errors in the KFB Increase

Even experienced knitters encounter tension inconsistencies or structural confusion when executing increases. Recognizing these failure points ensures your final project maintains a professional appearance.

• Root Cause: Dropping the stitch prematurely before working the back loop, resulting in a dropped stitch or an accidental yarn over.
  
  
  • Actionable Fix: Use a crochet hook to catch the unworked strand and pull it up through the back of the stitch, or tink back (un-knit) to the problematic stitch if the mistake occurred multiple rows below.
• Root Cause: Pulling the working yarn too tightly between the front and back loops, creating an overly tight, distorted horizontal bar or ladder.
  
  
  • Actionable Fix: Practice maintaining consistent yarn feed by tensioning your yarn through your fingers rather than clutching the needles tightly. Block your finished piece to help even out minor tension discrepancies.
• Root Cause: Working the back leg incorrectly by twisting the stitch in the wrong direction, which splits the plies of the yarn.
  
  
  • Actionable Fix: Ensure you clearly identify the rear leg of the stitch loop before insertion. If your yarn splits, withdraw the needle tip, clear the fibers, and re-insert smoothly.

Frequently Asked Questions

What does kfb mean in a knitting pattern?

The abbreviation kfb stands for "knit front and back." It is an increase method that turns a single stitch into two stitches by knitting into the front loop and then into the back loop of the same stitch before slipping it off the needle.

Does the kfb increase lean to the right or left?

The kfb increase has a slight right-leaning bias because the first stitch created sits slightly forward while the second stitch rests behind it. Due to this subtle texture and lean, many designers use it for seamed edges or textured borders where the visible bump is either hidden or celebrated as a design feature.

Can I use kfb in lace or stockinette stitch projects?

While you can use kfb in stockinette stitch, it leaves a small bump (resembling a purl bump) at the base of the increase, which disrupts the smooth V-shape of the fabric. For seamless stockinette projects, invisible increases like make one right or make one left are often preferred, whereas kfb excels in garter stitch, textured patterns, and structured garment seams.

How do I purl front and back (pfb) if the pattern requires it?

To work a purl front and back (pfb), you purl into the front loop of the stitch without dropping it, move your yarn to the back (or keep it in position depending on the exact technique), and then purl into the back loop of the same stitch before slipping it off the left needle. This is the purl-stitch equivalent of the kfb increase, used primarily in reverse stockinette or purl-textured garments.

Elevate Your Knitting Skills with Advanced Shaping Techniques

Mastering the knit front and back increase unlocks a vast array of garment patterns, allowing you to shape sweaters, socks, and shawls with absolute confidence. Explore our advanced masterclasses on seamless garment construction and professional finishing techniques to take your handmade wardrobe to the next level today.