At a Glance
- Two main casting-on styles dominate: the two-needle method (known as the Knitted Cast-On) and the thumb method (known as the Long-Tail Cast-On), both of which can be done with a single ball of yarn.
- To knit in the round using circular needles, you cast on flat and then join the circle using a stitch marker, ensuring the stitches are not twisted.
- The number of stitches to cast on always depends on your gauge (stitches per 10 cm or 4 inches), not a universal number that fits all yarns.
- Increases (M1L, M1R, yarn over) and decreases (k2tog, ssk) allow you to shape your work once the cast-on is complete.
- If a beginner struggles with casting on, it is rarely a lack of dexterity; they have almost always chosen the wrong method for their specific project.
Do you want to cast on but aren’t sure whether to use the two-needle method, the thumb method, or circular needles? Here is the direct answer: there isn’t just one “right” way to cast on, but several, each suited to a specific purpose. For a simple first project (scarf, dishcloth, flat hat), the thumb method is more than enough. For an elastic edge that needs to stretch (sweater cuffs, socks), the two-needle method or the long-tail version provides a more flexible edge. To knit in the round without seams (hats, sweater sleeves), you must cast on using circular needles and then “join” the row.
This article provides a step-by-step guide to each method, highlights the mistakes that most often trip up beginners, and explains how to increase and decrease once you’ve started.
Why Your Cast-On Method Changes Everything
Many beginner knitters learn only one casting-on technique and use it for every project, unaware that others are better suited for different tasks. The result? A sweater hem that isn’t stretchy enough to go over the head, or a shawl where the first row is so tight that it pulls the entire garment inward.
Casting on determines three things simultaneously: the starting number of stitches, the tension of the edge (elastic or rigid), and the visual appearance of the first row. Therefore, a casting-on method is never neutral. The Katia blog, for instance, lists six different techniques just for this first step (Katia Academy), proving that this isn’t just a technical detail but a design choice for every pattern.
Before choosing, only one question matters: should the final edge be soft and stretchy (neckline, cuff, sock) or crisp and stable (bag edge, cushion cover)? Your answer will lead you directly to one of the methods below.
Casting On with 2 Needles (Knitted Cast-On)
This is often the first method taught because it only requires one working needle at a time and closely mimics the motion of standard knitting.
Step-by-Step
Create a simple slip knot on the needle: this is your first stitch. Insert the second needle into this stitch as if to knit, wrap the yarn around the right needle, and pull the new loop onto the left needle without sliding it off the right. You now have a second stitch. Repeat the process: each new stitch is worked into the last stitch cast on the left needle, never into the starting knot.
Common Pitfalls
The most common mistake is pulling the yarn too tight after each stitch, making the following row nearly impossible to knit because the needle cannot enter the stitches. The fix is simple: let the stitches slide freely on the needle without tightening them against the tip. This method is well-suited for projects that don’t require a very stretchy edge, such as a bag, a pillow, or a granny square.
Casting On with the Thumb (Long-Tail Cast-On)
This method uses the thumb of the left hand to form each loop. Its main advantage is that it accounts for the necessary yarn length in one motion, unlike the two-needle method where you work directly from the ball without a pre-measured tail.
Step-by-Step
Leave a long tail of yarn (approximately three to four times the final width of your project to avoid running out). Wrap this tail around your left thumb to form a loop, slide the needle into this loop by going under the thumb, then tighten it while keeping the yarn from the ball taut with your index finger. Repeat the motion for each stitch: loop over the thumb, needle goes in, tighten.
Why This Method Is Highly Recommended for Beginners
The thumb method (Long-Tail) creates a more elastic edge than the knitted cast-on, making it ideal for sweater hems, cuffs, and socks. It is also the fastest method once mastered, as it requires only one hand to be active on the needle. The primary trap is the starting tail length: if it’s too short, you’ll run out of yarn on the last stitch and have to start over. It is always better to leave a generous tail than to have to recount on the final row.
Casting On with Circular Needles (Knitting in the Round)
Casting on with circular needles doesn’t change the basic technique (both the thumb and two-needle methods work), but it adds an extra step: closing the row into a circle to knit in the round without seams.
Step-by-Step
Cast on the number of stitches indicated in the pattern using your preferred method, directly onto the flexible cable of the circular needle. Spread the stitches out across the cable and check that none are twisted: each stitch should have its loop facing the same direction, with no crossovers along the entire cast-on. Bring the two ends of the circular needle together, place a stitch marker on the right needle to mark the beginning of the round, then knit into the first stitch, pulling firmly to avoid a visible gap between the start and end of the row.
The Mistake That Forces a Restart
A twisted stitch when joining in the round cannot be fixed later; it creates an unintentional twist visible throughout the height of the knit. You must check the alignment of the stitches before knitting the first point, not after (Knitting Tips). This vigilance applies whether you are making a hat, a sweater sleeve, or any knitting in the round project intended to be seamless.
Knitted vs. Long-Tail: What is the Actual Difference?
In practical terms, the difference is felt most in the texture of the finished edge: the knitted cast-on (two needles) creates a cleaner, more rigid edge, while the thumb method (Long-Tail) remains softer and more extensible.
The choice depends less on technical difficulty (both are accessible for your first ball of yarn) and more on the desired result. Someone making a knitted bag will prefer the knitted cast-on for structural integrity; someone making a hat or socks will opt for the thumb method for elasticity.
Casting On for Absolute Beginners: The Jargon-Free Version
If the previous methods still feel abstract, here is the simplest way to remember it for your first ball of yarn: make a loop with the yarn around your fingers, slide the needle inside, tighten gently, and repeat the motion while maintaining the same tension between each loop. The number of motions equals the number of stitches required by the pattern.
The only thing that truly matters at the start isn’t speed, but consistency: stitches cast on with different tensions result in an uneven edge, where some stitches are looser than others. It is better to cast on slowly and evenly than quickly and crookedly, even if it means undoing and restarting the first ten stitches once or twice.
A helpful tip passed down through generations of passionate knitters: never count the starting slip knot as a full stitch if it is meant to be undone later. This is a frequent point of confusion that throws off the total stitch count.
How Many Stitches to Cast On Based on the Yarn
You don’t guess the number of stitches to cast on; you calculate it based on the gauge—the number of stitches produced over 10 cm (or 4 inches) using a specific yarn and needle size. A fine yarn on small needles (like sock yarn) will produce a denser gauge than a chunky yarn on large needles. This is why patterns always list a reference gauge at the top: this is the number you must replicate, not a fixed stitch count that applies to all yarns.
Specifically, to achieve the desired width, multiply the gauge number (for 10 cm) by the target width in centimeters, then divide by ten. A yarn technical sheet (from brands like Phildar or others) specifies this gauge directly on the label, removing the guesswork.
Increases and Decreases: The Logical Next Step
Once the cast-on row is finished, most projects require shaping by adding or removing stitches as you progress. This is where increases and decreases come in.
Increases
For an invisible look without holes in the knitting (like sweater shoulders or underarms), the most common technique is the interstitial increase, noted as M1L or M1R depending on the direction: you knit into the horizontal strand between two stitches without knitting into an existing stitch. For an openwork pattern or lace, the yarn over is the correct technique: it intentionally creates a small decorative hole that is part of the design.
Decreases
To reduce the number of stitches, two techniques dominate: knitting two stitches together (the simplest decrease, leaning to the right) and the ssk/simple decrease (slip one, knit one, then pass the slipped stitch over), which leans to the left. Consistently using the same decrease on both sides of a project creates an asymmetrical look; alternating the directions based on the side of the work results in a professional, symmetrical finish.
Distribute Rather Than Isolate
A common mistake is thinking of each increase or decrease in isolation. Patterns almost always refer to “zones” of increases or decreases spread over several rows. An armhole, for example, is never shaped with a single decrease but with a regular series distributed in both height and width to achieve a progressive curve rather than a sharp angle.
Which Method Should You Choose for Your Project?
For a scarf, a baby blanket, or a bag, the two-needle method is sufficient and provides a stable edge. For a hat, socks, or sweater cuffs, the thumb method provides the necessary elasticity. For anything knit without seams (hats in the round, sleeves, socks), use circular needles with either base method, joined in a circle with a stitch marker.
In all cases, the number of stitches to cast on depends on the actual gauge achieved with your specific yarn and needles, never a standard number copied from one project to another.
FAQ
How many ways are there to cast on?
Reference tutorials usually list about six, but in daily practice, two dominate: the two-needle method (Knitted Cast-On) and the thumb method (Long-Tail Cast-On). Others are more technical variants reserved for specific needs, such as provisional cast-ons or ultra-elastic edges.
What is the difference between casting on “English style” and with 2 needles?
They are actually the same technique: “English cast-on” and “two-needle cast-on” both refer to the knitted cast-on method, as opposed to the “French” or thumb method.
How do I cast on for knitting in the round without twisting the stitches?
Spread all the cast-on stitches across the circular needle cable and check that no loops are crossed before joining the row. Once the first stitch is knitted to join the round, a twisted stitch cannot be corrected without undoing everything.
How many stitches should I cast on for my project?
This depends solely on the gauge achieved with your yarn and needles (number of stitches per 10 cm), multiplied by the desired width. The pattern or the yarn label indicates this reference gauge.
Is the thumb method harder than the two-needle method?
No, it simply requires a different motion: a loop formed around the thumb rather than a stitch worked with a second needle. The only real difficulty is ensuring you leave enough of a tail at the start so you don’t run out before the last stitch.
Which casting-on method gives the stretchiest edge?
The thumb method (Long-Tail) generally produces a softer and more extensible edge than the two-needle method, making it preferable for collars, cuffs, and socks.
How do I distribute increases or decreases across a row?
You should never place an increase or decrease in isolation: instead, distribute a regular series over several rows and across the affected width to achieve a progressive curve rather than a sharp angle.
Can you cast on with only one needle?
Yes, some methods like the Italian cast-on are done with a single working needle, without a second needle or a pre-calculated tail, but these are less commonly taught to beginners than the two-needle or thumb methods.
Casting on is more than just a technical formality: it is the choice that determines whether your finished edge will be soft or rigid, crisp or elastic. Start by identifying the desired look for your project, then choose the appropriate method from those presented here rather than sticking to the first one you learned. Once you’ve mastered the cast-on, increases and decreases open the door to more complex shapes: sweaters, hats, and socks. If you are just starting, a simple ball of yarn and two needles suited to its thickness are all you need to practice those first ten stitches without pressure.
See also
