How to Cast On Knitting: Explained Step-by-Step

Cast-on is the first technical move in any knitting project. It is also the one beginners most often get wrong on the first try, partly because every YouTube tutorial uses different hand positioning and partly because the yarn-tail length nobody specifies until you have already run out at stitch 38.

This guide walks through the three cast-on methods every knitter eventually learns, in the order you should learn them: long-tail (the most common), knitted (the easiest to remember), and cable (for hems and sweater bands). It also covers the two things that go wrong on a beginner cast-on, how to fix them, and what to knit immediately after you have cast on so the technique sticks.

If you have not picked up needles before, start with the broader knitting for beginners day-one guide first. This post assumes you have needles, yarn, and the will to learn one technique well.

Long-Tail Cast-On (the Most Common)

The long-tail cast-on is the one almost every beginner pattern assumes you know. It produces a slightly stretchy edge that works for scarves, hats, cowls, sweater hems, and almost everything in between. The reason it dominates beginner instruction is that it casts on stitches AND knits the first row simultaneously, which means by the time you have your stitches on the needle, you are one row into your project.

It also looks neat from both sides, which matters when the cast-on edge is visible on a scarf or a blanket.

Step-by-Step Long-Tail Cast-On

Here is the move broken into 12 steps. The hand position takes a few attempts to feel natural. Plan on 20 to 30 minutes of practice the first time.

1. Estimate the yarn tail. For most projects, leave a tail roughly 1 inch per stitch you plan to cast on, plus 6 extra inches for weaving in at the end. Casting on 25 stitches? Pull out about 31 inches of tail before you start. (More on this in the yarn-tail section below.)
2. Make a slip knot. Form a loop with the yarn, pull a second loop through it, and tighten gently around your needle. The slip knot counts as your first stitch.
3. Hold the needle in your right hand. The slip knot sits near the tip of the needle.
4. Set up the slingshot. Drape the two strands of yarn over your left hand so the tail goes around your thumb and the working yarn (the strand attached to the ball) goes around your index finger. Close your remaining three fingers around both strands to anchor them. From above, your left hand looks like a backwards "L" with the needle aimed between the thumb and the index finger.
5. Bring the needle under and up through the thumb loop. Insert the needle tip from the front, under the thumb yarn, scooping up through the V between thumb and index finger.
6. Hook the index-finger yarn. With the needle tip now above the V, swing it over the index-finger strand and grab the yarn from the back.
7. Pull the index-finger yarn back down through the thumb loop. This is the move that creates a new stitch.
8. Drop the thumb loop. Release your thumb from the loop.
9. Tighten the new stitch. Use your left thumb and index finger to gently snug the new stitch onto the needle. Not tight (more on that below), just snug.
10. Reset the slingshot. Rebuild the V between your thumb and index finger.
11. Repeat steps 5 through 10 for each new stitch. Most beginners find a rhythm by the eighth stitch.
12. Stop when you reach the cast-on count specified in the pattern. Count your stitches before you start row one. If the pattern says 25 stitches, count to 25.

Why the Slingshot Is Worth the Effort

The slingshot hand position feels awkward for the first 30 stitches. Almost everyone wants to give up and switch to the easier knitted cast-on. Push through it. The long-tail edge is more elastic than the knitted cast-on, which means it will not pucker on a sweater hem or a cowl edge where the cast-on needs to give a little when you wear the finished piece.

If you want a video walkthrough of the slingshot hand position, the Craft Yarn Council technique library and VeryPink Knits both have free tutorials that show the hand mechanics from the same angle your hands will be in.

Knitted Cast-On (the Easiest to Remember)

The knitted cast-on uses the same motion as a knit stitch. If you can knit, you can knit-cast-on. That makes it the easiest method to remember, especially if you take a long break between projects and forget the long-tail slingshot.

Step-by-Step Knitted Cast-On

1. Make a slip knot and place it on the left needle.
2. Insert the right needle into the slip knot from front to back, just like the start of a regular knit stitch.
3. Wrap the working yarn around the right needle.
4. Pull the new loop through, just like a knit stitch.
5. Instead of letting the new stitch slide off the right needle, place it back on the LEFT needle (slide it onto the left tip).
6. You now have two stitches on the left needle. Insert the right needle into the second stitch (the one you just made), wrap, pull through, and transfer it back to the left needle.
7. Repeat for each new stitch.

When to Use Knitted Cast-On

The knitted cast-on produces a less elastic edge than long-tail. It also tends to be looser, which is fine on washcloths and dishcloths and not great on sweater hems where you want some structure.

Use knitted cast-on when:

• You are learning your second cast-on method and want to reinforce the knit-stitch motion
• You forgot the long-tail slingshot mid-project and need to add stitches
• The pattern specifies it (some lace patterns prefer knitted for the open edge)

The knitted cast-on is also useful in the middle of a project when you need to add stitches at the end of a row, like for a thumb gusset or a cardigan front.

Cable Cast-On (for Hems and Sweater Bands)

The cable cast-on is the long-distance runner of cast-on methods: slower per stitch, sturdier finish. It produces a firm, rope-like edge that does not stretch much. That is exactly what you want on a sweater hem, a cardigan band, or a cuff that needs to hold its shape against years of wear.

Step-by-Step Cable Cast-On

1. Make a slip knot, place it on the left needle.
2. Knit one stitch and transfer it to the left needle (same as the knitted cast-on so far).
3. For every subsequent stitch, insert the right needle BETWEEN the last two stitches on the left needle (not into a stitch).
4. Wrap the yarn, pull a new loop through, and transfer the new stitch to the left needle.
5. Repeat. Each new stitch is created by inserting between the last two existing stitches.

The "between the stitches" insertion is what creates the rope-like cable structure on the finished edge. It is the difference between a sweater hem that holds its shape after 50 wears and one that bags out within a season.

When to Use Cable Cast-On

Use cable for:

• Sweater hems and cardigan bands
• Cuffs at the wrists or ankles
• Buttonbands on the front of a cardigan
• Any edge where you want zero stretch and visible structure

Skip cable for scarves and lacework, where the firm edge fights against the drape of the finished piece.

How Much Yarn-Tail to Leave

This is the question that tutorials skip and beginners discover the hard way: how long should the yarn tail be?

The standard rule is 1 inch of tail per cast-on stitch, plus 6 inches for weaving in at the end. For 25 cast-on stitches you want roughly 31 inches of tail. For 100 cast-on stitches (a sweater hem) you want roughly 106 inches.

That math gets long for a sweater. Here is the shortcut most experienced knitters use instead.

The Wrap-the-Needle Trick

Wrap the yarn around the needle the number of times equal to your cast-on stitch count, then add a few extra inches. For 25 stitches, wrap the needle 25 times, unwrap, and that is approximately your tail length. The wrap accounts for the needle diameter, which is the variable that makes the per-stitch math drift on larger needle sizes.

For a US 10 bamboo needle, 25 wraps gives you roughly 30 inches. For a US 15, 25 wraps gives you closer to 38 inches because the larger needle uses more yarn per wrap.

What Happens When the Tail Runs Out Early

You ran out of tail at stitch 22. Now what?

Stop. Pull the existing stitches off the needle. Cut the working yarn at the same length you started with, plus 50% more for safety. Re-cast-on from scratch. The pulled-out work takes 30 seconds to undo. Continuing with a too-short tail and trying to splice in extra yarn makes the cast-on edge bumpy and is harder to fix later than just starting over.

The Two-Skein Trick (for Long Cast-Ons)

For sweater hems where the cast-on count exceeds 100 stitches, some knitters use two strands of yarn from two different ends of the same skein for the cast-on, then drop one strand and continue with the other for row one. This eliminates the math entirely. Use the two-strand method when:

• You are casting on more than 80 stitches
• Your skein has both ends accessible (most do, both the outer end and the center pull)
• The yarn is not too splitty (Cloudtouch® baby alpaca-pima cotton handles this fine because the AirJet processing locks the fibers; some pure single-ply alpacas do not)

Fixing a Cast-On That Is Too Tight

A too-tight cast-on is the second most common beginner problem (after the slingshot frustration). The symptom: you cast on 25 stitches, you go to knit row one, and the stitches will not slide easily down the needle. Your row one is a fight.

Why It Happens

Beginners snug each cast-on stitch tightly because it feels like the right thing to do. It is not. Every cast-on stitch should sit on the needle loosely enough to slide.

The Fix Mid-Cast-On

If you are still casting on, slide each new stitch down the needle to where the previous stitch already sits, then snug it gently. The "slide-then-snug" rhythm prevents over-tightening.

The Fix After Casting On

If you have already cast on 25 stitches and the row one is too tight, the easiest fix is to use a needle one size larger for the cast-on, then switch to the pattern-specified size for row one. So if your pattern calls for US 10 needles, do the cast-on with a US 11. The slightly larger needle leaves more room in each stitch.

This is the trick most experienced knitters use by default for sweater hems and any project where the cast-on edge needs to lie flat after the project is done.

What to Knit After You Cast On

The fastest way to make a cast-on technique permanent is to knit the row immediately after you finish the cast-on, before you set the project down. The motion is fresh, the hand position is set, and you reinforce the muscle memory.

For beginners, the project to knit right after a cast-on is a garter-stitch scarf. One stitch (knit), every row. The scarf gets long, your hands get faster, and within a hundred rows the cast-on technique is automatic.

The Sierra Yarn pattern library includes the Journey Scarf pattern, which is built as exactly this practice project: 25-stitch long-tail cast-on, garter stitch for the body, basic bind-off. The full kit includes Cloudtouch® baby alpaca-pima cotton yarn, US 10 bamboo circular needles, and a video walkthrough that covers the cast-on hand position from the same angle your hands will be in. If you want yarn that does not split during cast-on (the most common reason a beginner cast-on goes wrong), the AirJet-processed Cloudtouch® blend is purpose-built for this scenario.

For a broader view of which beginner projects pair best with which cast-on method, see the Sierra Yarn guide on how to knit for beginners, which walks through the full first-project decision (yarn, needles, project length, technique).

Frequently Asked Questions

Which cast-on should I learn first?
Long-tail. It is in 80% of beginner patterns, it produces an elastic edge that works for almost any project, and it counts as both a cast-on and the first row, which saves time.

Why does my long-tail cast-on look uneven?
The most common cause is inconsistent tension on the slingshot. As you cast on stitches 1 through 5, your hand is still figuring out the motion. By stitch 15 your tension has settled. The first few stitches will look slightly different from the rest. This evens out after blocking (lightly steaming or wet-blocking the finished piece). It is not a problem.

How do I know if my cast-on is too tight?
Try to slide the cast-on stitches along the needle. If they move freely, the tension is right. If they grip the needle and resist, you are too tight. Re-cast on with a needle one size larger.

Can I cast on with circular needles?
Yes, all three methods work on circular needles. The slingshot motion for long-tail is identical. The circular cable holds the cast-on stitches in a straight line just like a straight needle does.

What is the difference between cast-on and bind-off?
Cast-on is how stitches first attach to the needle (start of project). Bind-off is how stitches come off the needle (end of project). They use different motions but the same general idea: each stitch is created or removed by working with the previous stitch.

Do I need to know all three cast-on methods?
No. Long-tail will carry you through most beginner projects. Add knitted cast-on around project five (or any time you forget the long-tail slingshot mid-project). Add cable cast-on when you start your first sweater.

Practice the Cast-On This Weekend

The fastest way to make a cast-on technique automatic is to do it 10 times in two days. Cast on 25 stitches, knit one row, pull it all out, cast on again. By repetition five your hands stop fighting the motion. By repetition ten the slingshot feels natural.

If you want a structured first project to practice on instead of just casting on and pulling out, the Sierra Yarn beginner kits collection includes scarves, cowls, and beanies that all start with a long-tail cast-on. Each kit ships with the yarn, the needles, the printed pattern, the tapestry needle, the woven label, and a private video tutorial that covers the cast-on for that specific project.

Shop Beginner Knitting Kits

If you already know you want the Journey Scarf specifically (the pattern this guide uses as the example project), the Journey Scarf gives you the exact written pattern and the cast-on count. Pair it with any worsted-to-bulky non-itchy yarn and you have the full project.