What Rib Knit Stitch Is and Why You Use It
Rib knit stitch is a pattern where you alternate knit and purl stitches in the same row, then work the opposite stitch in the next row. The result is vertical ridges that look like ribs running up your fabric. The most common version is called 1×1 rib: one knit stitch, one purl stitch, repeated across the row.
Rib stitch is stretchy and bouncy, which is why it appears on cuffs, collars, and waistbands of sweaters and hats. It pulls inward and hugs the body, so it holds shape better than stockinette stitch (the smooth, flat knit you see on most sweater bodies). The stretch comes from the way knit and purl stitches sit next to each other—they naturally compress and expand.
You will see rib stitch in different widths: 1×1 (one knit, one purl), 2×2 (two knits, two purls), and 3×3. The wider the rib, the chunkier and stretchier the fabric. For your first time, 1×1 rib is the easiest to learn and the most common in patterns.
Key Takeaways
- Rib stitch alternates knit and purl stitches in each row, with the pattern shifting by one stitch in the next row so purls sit above knits.
- You need to know how to knit and purl before starting rib stitch, since you will switch between the two stitches every stitch.
- Cast on an even number of stitches for 1×1 rib so the pattern lines up correctly at the edges.
- The most common mistake is accidentally knitting when you should purl (or vice versa), which breaks the rib pattern and creates a bumpy line.
- Rib stitch works best with needles one or two sizes smaller than you would use for stockinette with the same yarn, because the tight pattern can look loose otherwise.
Cast On the Right Number of Stitches
For 1×1 rib, cast on an even number of stitches. This means 20, 24, 30, 40—any number that divides by two. If you cast on an odd number, the pattern will not line up at the edges and will look uneven.
The cast-on method does not matter for rib stitch itself, but a long-tail cast-on or cable cast-on gives you a neat edge that looks professional. Avoid casting on too loosely, because rib stitch is already stretchy and a loose cast-on will make the edge flop.
If you are practicing, cast on 20 or 24 stitches. That is wide enough to see the pattern clearly but not so wide that you get tired before you finish a few rows.
Work the First Row: Knit 1, Purl 1
Row 1 sets the pattern. You will alternate knit and purl across the entire row. Start with a knit stitch.
Step 1: Insert your right needle through the first stitch on your left needle from left to right (the same direction as a regular knit stitch). Wrap the yarn around and pull through to create a knit stitch. You now have one knit stitch on your right needle.
Step 2: Move your yarn to the front of your work. Insert your right needle through the next stitch from right to left (the opposite direction from a knit). Wrap the yarn around and pull through to create a purl stitch.
Step 3: Move your yarn to the back of your work. Knit the next stitch the same way you knit in Step 1.
Step 4: Move your yarn to the front. Purl the next stitch the same way you purled in Step 2.
Repeat Steps 3 and 4 until you reach the end of the row. You should end with a purl stitch if you started with a knit stitch and cast on an even number.
Work the Second Row: Purl 1, Knit 1
This is where rib stitch creates its vertical ridges. In Row 2, you will purl over the knits from Row 1 and knit over the purls from Row 1. This is called knitting into the stitch—you work the opposite stitch so the ribs stack vertically.
Step 1: Turn your work around so the yarn is at the right side. Move your yarn to the front of your work. Insert your right needle through the first stitch (which is a knit stitch from Row 1) from right to left and purl it.
Step 2: Move your yarn to the back. Insert your right needle through the next stitch (which is a purl stitch from Row 1) from left to right and knit it.
Step 3: Move your yarn to the front. Purl the next stitch (a knit from Row 1).
Step 4: Move your yarn to the back. Knit the next stitch (a purl from Row 1).
Repeat Steps 3 and 4 until the end of the row. You should end with a knit stitch.
Continue the Pattern and Spot Mistakes Early
Rows 3 and beyond repeat Row 1 and Row 2 over and over. After you finish Row 2, go back to Row 1's pattern: knit 1, purl 1 across. Then Row 2's pattern again: purl 1, knit 1 across. The ribs will start to show after three or four rows.
Watch for the most common mistake: working a knit when you should purl, or a purl when you should knit. This creates a horizontal bump or line that breaks the vertical rib. If you spot it in the row you just finished, you can drop back one row and fix it. If you do not notice until several rows later, it is usually easier to keep going and accept the small mistake than to unravel.
Another common issue is tension. If your knit stitches are much tighter than your purl stitches (or vice versa), the ribs will look uneven and wavy. This improves with practice. For now, try to keep the same tension on both stitches by wrapping the yarn the same way each time.
Bind Off Rib Stitch Correctly
When you are ready to finish, bind off using the standard method: knit two stitches, pass the first stitch over the second, knit one more stitch, pass the first over the second, and repeat until one stitch remains. Cut the yarn and pull it through the last stitch to find it.
Some knitters prefer to bind off in pattern, meaning they knit the knit stitches and purl the purl stitches as they bind off. This keeps the edge stretchy and neat. It takes a few extra seconds but looks more polished, especially on a cuff or collar where the bind-off edge shows.
Troubleshooting Common Problems
The ribs look loose or uneven. This usually means your tension is inconsistent or your needles are too large. Try needles one size smaller and focus on wrapping the yarn the same way for each stitch. Rib stitch is forgiving—a few rows of practice will tighten up your tension naturally.
You lost track of whether to knit or purl. Look at the stitch on your left needle. If it looks like a V (a knit stitch), purl it in this row. If it looks bumpy (a purl stitch), knit it. This is the quickest way to stay on track without counting.
One side of your rib looks different from the other. This often happens if you accidentally switched the pattern halfway through a row. Check the last few rows to find where the switch happened. If it is recent, you can unravel back to that point and redo it. If it is several rows back, it is usually not worth fixing.
The edges are messy or uneven. Make sure you are slipping the first stitch of each row instead of knitting it. This creates a neat edge. To slip a stitch, insert your right needle through it from left to right without wrapping yarn, and move it to the right needle. Then work the rest of the row normally.
Frequently Asked Questions
Do I have to start with a knit stitch, or can I start with a purl?
You can start with either, but starting with a knit stitch is standard. The pattern will look the same either way—you will still get vertical ribs. Just make sure you are consistent: if you start Row 1 with a knit, start every odd row with a knit, and every even row with a purl.
What is the difference between 1×1 rib and 2×2 rib?
In 1×1 rib, you knit one stitch and purl one stitch. In 2×2 rib, you knit two stitches and purl two stitches. The ribs are wider and chunkier in 2×2. You need to cast on a multiple of four stitches for 2×2 rib (like 20, 24, 28) instead of just an even number. The technique is the same—you just repeat the knit and purl groups instead of single stitches.
Why does my rib stitch look bumpy instead of smooth?
Bumps usually mean you knitted a stitch that should have been purled, or vice versa. Look at the bumpy area and trace back a few rows to find where the pattern broke. If it is recent, unravel and redo. If it is old, it is usually not worth fixing unless it is very visible.
Can I use rib stitch for an entire sweater, or just cuffs?
You can use it for an entire sweater, but it will be very stretchy and may not hold its shape as well as stockinette. Most sweaters use rib stitch only on the cuffs, collar, and waistband because those areas need the stretch and grip. The body is usually stockinette or another flat stitch.
What needle size should I use for rib stitch?
Use needles one or two sizes smaller than you would use for stockinette with the same yarn. Rib stitch naturally creates a tighter fabric, so smaller needles prevent it from looking loose and floppy. Check your yarn label for the recommended needle size, then go down one or two sizes for rib.