Casting on creates the first row of loops on your needle
Casting on is how you place the initial loops—called stitches—onto your knitting needle. Without a cast-on row, you have nowhere to knit into. The method you choose affects how your finished edge looks and how stretchy it is. Most knitters learn one or two methods and use them for nearly every project.
The four most common cast-on methods are the long-tail cast-on, the cable cast-on, the thumb cast-on, and the provisional cast-on. Each one takes a different amount of yarn, uses a different hand motion, and produces a different edge. Beginners usually start with either the thumb cast-on or the long-tail cast-on because both are straightforward and produce a neat, usable edge.
Key Takeaways
- The thumb cast-on is the fastest method and uses the least yarn, making it ideal for beginners and small projects.
- The long-tail cast-on produces a professional-looking edge and is the most common method used by experienced knitters.
- The cable cast-on creates a sturdy, decorative edge and works well for projects that need a strong foundation.
- You need to know how many stitches you want before you begin, which is usually specified in your knitting pattern.
The thumb cast-on: fastest and simplest
The thumb cast-on, also called the one-needle cast-on, requires only one needle and your thumb. Make a loop with your yarn, slip it onto your needle, then use your thumb to create each new stitch. This method is the quickest to learn and uses the least amount of yarn.
To do it: tie a knot near the end of your yarn and slip the loop onto your needle. Wrap the yarn around your thumb, insert the needle through the loop on your thumb from front to back, pull the yarn tight, and slip your thumb out. Repeat until you have the number of stitches you need. The edge will be slightly loose, which is fine for many projects, but it can unravel if you pull on it before you knit the first row.
This method works best for scarves, blankets, and other projects where the cast-on edge will not be handled much before you finish knitting. It is less suitable for fitted garments where the edge needs to stretch evenly with the rest of the fabric.
The long-tail cast-on: the standard choice
The long-tail cast-on uses two needles and produces a balanced, professional-looking edge that stretches evenly. It is called "long-tail" because you need a length of yarn before the working yarn—usually about three times the width of your finished piece. This method takes more practice than the thumb cast-on, but most knitters use it for nearly every project once they learn it.
To do it: measure out a tail of yarn (roughly three times the width of what you are knitting), make a loop, and slip it onto your needle. Hold the needle in your right hand. With your left hand, hold the tail and working yarn between your thumb and fingers so the tail runs over your thumb and the working yarn runs over your index finger. Insert the needle under the loop on your thumb, then over the loop on your index finger, then back under the thumb loop. Pull both strands to tighten. Repeat until you have the number of stitches you need.
The long-tail cast-on creates an edge that looks finished on both sides, which is why it is used for projects where the cast-on edge will be visible, such as the cuffs of socks or the neckline of a sweater.
The cable cast-on: sturdy and decorative
The cable cast-on uses two needles and creates a thick, decorative edge that is very sturdy. It takes longer than the thumb or long-tail method, but it is useful when you need a strong foundation—for example, at the edge of a ribbed cuff or when you are knitting something that will get a lot of wear.
To do it: cast on two stitches using the long-tail method (or any method you know). Insert your right needle between the two stitches on your left needle, wrap the yarn around the right needle, and pull a new loop through. Slip this new stitch onto the left needle. Repeat, always inserting the needle between the last stitch and the one before it. This creates a braided appearance.
The cable cast-on is slower than other methods because each new stitch requires you to work between existing stitches. However, the edge it produces is dense and will not stretch out of shape, which makes it worth the extra time for projects that need durability.
The provisional cast-on: for projects you will unravel
The provisional cast-on is used when you plan to unravel the cast-on edge later and pick up those stitches to knit in the opposite direction. This is common in projects like two-directional scarves, sweaters where you knit the body first and then add sleeves, or when you want to add a border after the main piece is done.
The most common provisional method uses a crochet hook and waste yarn (a length of yarn in a contrasting color that you will remove later). Chain the number of stitches you need using the crochet hook, then pick up one loop from each chain with your knitting needle. When you are ready to unravel, you straightforward pull the waste yarn out and the live stitches are ready to knit.
If you do not have a crochet hook, you can also use a provisional cast-on with just yarn and needles, though it is trickier. The waste-yarn method is more reliable and easier to undo without dropping stitches.
How to choose the right cast-on for your project
Your pattern will usually tell you which cast-on to use, but if it does not, think about what the edge needs to do. If the cast-on edge will be visible and needs to stretch (like a neckline), use the long-tail cast-on. If you need a sturdy, decorative edge (like a cuff), use the cable cast-on. If you are in a hurry or working on a casual project, the thumb cast-on is fine. If you plan to pick up stitches later, use the provisional cast-on.
The number of stitches you need is always given in your pattern. Count carefully as you cast on—if you cast on too many or too few, your finished piece will be the wrong size. It is easier to start over than to fix a cast-on mistake after you have knitted several rows.
Common mistakes when casting on
The most common mistake is casting on too tightly, which makes the first row hard to knit and creates an edge that does not stretch. If your cast-on stitches are tight, try using a needle one or two sizes larger for the cast-on row, then switch to your regular needle for the first row of knitting. Another common mistake is twisting the stitches as you place them on the needle, which creates a crooked edge. Make sure each loop sits flat on the needle before you move to the next stitch.
Beginners often also underestimate how much yarn they need for the long-tail cast-on. If you run out of tail before you finish, you can tie on more yarn and continue, but it is easier to measure generously at the start. A good rule of thumb is to measure out a tail about three times the width of your finished piece, then add a few extra inches.
Frequently Asked Questions
What if I cast on the wrong number of stitches?
If you notice the mistake before you knit the first row, straightforward pull the yarn and unravel the cast-on, then start over. If you have already knitted a few rows, it is usually faster to start the whole project over than to try to fix it. Count your stitches carefully before you knit the first row.
Can I use the same cast-on method for every project?
Yes. Many knitters use the long-tail cast-on for almost everything because it produces a good edge and works for most projects. Once you are comfortable with one method, you do not need to learn others unless you want a specific look or edge for a particular project.
How tight should my cast-on stitches be?
Cast-on stitches should be snug enough that they do not slide off the needle, but loose enough that you can insert your working needle through them easily. If the first row is hard to knit, your cast-on is too tight. Practice will help you find the right tension.
Do I need to count stitches as I cast on?
Yes. Count every stitch as you place it on the needle, or count again before you knit the first row. It is straightforward to lose track, especially when you are learning. Some knitters place a stitch marker every ten stitches to make counting easier.
What is waste yarn and where do I get it?
Waste yarn is any yarn you do not mind throwing away—usually a contrasting color so it is straightforward to see and remove later. You can use leftover yarn from another project, or buy a small ball of inexpensive yarn. It does not need to match your project yarn.