Beginner Mitred Square Knitting Video Tutorial: Everything You Need to Know to Get Started

If you’ve been scrolling through knitting communities online or browsing finished projects on social media, you’ve almost certainly come across the geometric beauty of mitred squares. Those crisp diagonal lines, the satisfying way colours blend and shift, the modular nature that lets you build something enormous from a series of small, manageable pieces — it’s no wonder so many knitters fall in love with this technique. Whether you’re a complete beginner who has only just mastered the knit stitch, or someone with a little experience looking for a new project to stretch your skills, learning to knit mitred squares is one of the most rewarding decisions you can make.

This guide is designed to walk you alongside the best beginner mitred square knitting video tutorials available, explain the core concepts in plain language, and give you the context and confidence to sit down with your yarn and needles and actually make something beautiful. By the time you finish reading, you’ll understand what a mitred square is, why it’s such a popular technique, what materials you’ll need, how the construction works step by step, and how to take your first squares and turn them into a finished project.

What Is a Mitred Square in Knitting?

A mitred square — sometimes written as mitered square, and also called a bias square or diminishing square — is a square of knitted fabric worked on the diagonal. Instead of knitting from one side to the other in straight rows, you begin at one corner, cast on stitches along two edges, and work decreases at the centre of every right-side row. Those central decreases pull the fabric inward in a diagonal line, creating the distinctive V-shape or chevron that makes these squares so recognisable.

The result is a perfectly square piece of knitted fabric with a diagonal ridge running from corner to corner. The magic is in how simple the construction actually is: knit across, decrease in the middle, turn, purl back, repeat. That’s the entire recipe. Despite that simplicity, the finished fabric has a complex, textured appearance that belies the straightforward process behind it.

Because each mitred square is worked independently, this technique is sometimes called modular knitting. You can make one square as a dishcloth, four squares as a small cushion cover, sixteen squares as a baby blanket, or hundreds of squares as a full-size throw. The project scales infinitely, and you can knit squares in one colour, two colours, variegated yarn, or combine any number of shades to create stripes, gradients, or entirely random colour arrangements. No two mitred square projects look exactly alike, which is part of what keeps knitters coming back to this technique again and again.

Why Video Tutorials Are the Best Way to Learn Mitred Squares

Knitting is a tactile, visual craft, and while written patterns and stitch instructions have their place, there are certain techniques that truly come to life when you can watch someone else’s hands performing them in real time. Mitred squares fall firmly into this category.

Reading that you should “k2tog, slip the resulting stitch, k1, psso” at the centre of your row is one thing. Watching a tutorial creator’s fingers move through those exact stitches, seeing how the needle enters the work, observing the tension being maintained, and noticing how the fabric begins to pull into that diagonal shape — that’s something entirely different. Video makes the invisible visible.

A good beginner mitred square knitting video tutorial will slow down at the tricky moments, show multiple camera angles, and often demonstrate both the cast-on and the decrease technique before diving into the full square. Many creators also show the finished square from different angles, demonstrate how to weave in ends, and give tips on joining squares together. When you’re learning a new technique, that level of contextual detail is invaluable.

Search platforms like YouTube are packed with tutorials aimed specifically at beginners, and many of them are genuinely excellent. Look for videos that have a clear title mentioning “beginner,” show a confident and calm presenter, include timestamps or chapters so you can navigate back to specific moments, and have a comment section where you can ask questions and see what other beginners have struggled with or clarified.

Materials You’ll Need Before You Start

One of the most appealing things about mitred squares as a beginner project is that they don’t require any specialist equipment. If you’ve done any knitting at all, you almost certainly already have everything you need.

You’ll want a set of straight needles or a short circular needle in a size appropriate to your chosen yarn. Most beginners find it easiest to start with a medium-weight yarn — often labelled as DK or worsted weight — and a needle size between 4mm and 5mm. This combination produces fabric that’s neither too loose nor too tight, and the stitches are large enough to see clearly what you’re doing without being so chunky that the project feels clunky.

For your yarn, scraps and leftovers are absolutely perfect for mitred squares. In fact, many experienced knitters use this technique specifically to use up their stash. If you’re buying yarn fresh, choose something smooth rather than fuzzy or textured, at least for your first square. Smooth yarn lets you see your stitches clearly, which makes learning much easier. A light or medium colour is also helpful for beginners, since dark yarn can make it difficult to see individual stitches.

You’ll also need a tapestry needle or darning needle for weaving in ends once your square is finished, a pair of scissors, and optionally some stitch markers, though many knitters find they don’t need markers for mitred squares once they’ve worked a few rows and can recognise the centre decrease position by sight.

Understanding the Cast-On for Mitred Squares

The cast-on for a mitred square can feel a little unusual if you’re used to casting on all your stitches in a single row for a conventional piece of knitting. Some methods require you to cast on an odd number of stitches — commonly anywhere from 21 to 41 stitches for a small or medium square — and the centre stitch of that cast-on row is where your first decrease will happen.

A long-tail cast-on is popular for mitred squares because it creates a neat, firm edge that mirrors the finished look of the rest of the square. However, a simple knitted cast-on or cable cast-on also works perfectly well for beginners. The video tutorial you choose will likely demonstrate the creator’s preferred cast-on method, and it’s a good idea to follow along with whatever they show, at least for your first square. You can always experiment with different cast-on methods once you understand the structure.

What matters most is that you cast on the correct number of stitches and identify the centre stitch clearly. Many beginners find it helpful to place a stitch marker either side of that centre stitch, though this isn’t strictly necessary. In a typical beginner square, you might cast on 41 stitches and consider stitch 21 to be your centre.

How the Decrease Works

The decrease at the centre of each right-side row is the heart of the mitred square technique, and it’s the moment that most beginners feel both confused and delighted by in equal measure. Once you work your first decrease and see that diagonal line beginning to form, everything clicks into place.

There are several ways to work a centred double decrease, but the most commonly used method in mitred squares is the slip-knit-pass method, sometimes written as sl1, k2tog, psso or as sk2p. This decrease removes two stitches at once and creates a symmetrical diagonal line. Here’s how it works in plain terms: you slip one stitch from your left needle to your right needle without knitting it, knit the next two stitches together as if they were one, and then lift the slipped stitch over the stitch you just created. Two stitches gone, one stitch remaining at the centre.

Some patterns use a slightly different approach, working a simple k2tog (knit two together) on either side of a central stitch rather than a double decrease. This creates a slightly different visual effect — two diagonal lines converging toward the centre rather than one — and is equally valid. The video tutorial you follow will specify which decrease method to use, and it’s worth watching that section of the video several times before you try it on your own knitting.

After every decrease row, your stitch count drops by two. So if you started with 41 stitches, after your first decrease row you’ll have 39, then 37, then 35, and so on until you’re down to just a handful of stitches. At that point, you cast off or break the yarn and pull the tail through the remaining stitch to secure it.

Row by Row: What a Typical Square Looks Like

Working through a mitred square in a video tutorial, you’ll typically see the following sequence repeated from beginning to end.

Row 1, the right side, is a knit row where you work across all stitches to the centre, work your double decrease, and then knit to the end. Row 2, the wrong side, is usually a simple purl row across all stitches, or in some patterns a knit row if you want a garter stitch texture throughout. Then you return to row 1 and repeat.

That’s genuinely it. The repetition is meditative once you’ve found your rhythm, and many knitters report that mitred squares are perfect knitting for watching television, chatting with friends, or listening to podcasts, because the pattern is simple enough to work without constant concentration but engaging enough to keep your hands busy.

If you’re working in two colours — which is a very popular choice for mitred squares and creates that lovely striped diagonal effect — you’ll simply change colours every two rows. Carry the unused colour loosely up the side of your work so you don’t have to cut and rejoin constantly. The video tutorial will show you exactly where to switch colours, and once you’ve seen it demonstrated, the process becomes intuitive very quickly.

Common Mistakes and How to Avoid Them

Even with the best video tutorial, beginners sometimes run into the same handful of issues. Knowing what to watch out for in advance can save you a lot of frustration.

The most common mistake is losing track of which row is the right side and which is the wrong side. If you accidentally work a decrease on a wrong-side row, your square will start to look uneven and the diagonal line will be crooked. A simple remedy is to place a small piece of contrasting yarn or a clip-on stitch marker on the right side of your work before you begin, so you always know which face is which.

Another very common issue is working the decrease in the wrong place — either one stitch too early or one stitch too late. This pushes the diagonal line off-centre and gives the finished square a lopsided appearance. Counting your stitches on the first few rows and making sure the decrease always falls at the exact centre will prevent this. As mentioned above, stitch markers on either side of the centre stitch are your friend as a beginner.

Some beginners also find that their edges curl or that the fabric is uneven in tension. Both of these issues typically resolve themselves once you’ve washed and blocked the finished square. Blocking — the process of wetting your knitted fabric and pinning it flat to dry — is particularly important for mitred squares because it evens out the tension and allows the natural geometry of the construction to shine. Many video tutorials will include a brief section on blocking, and it’s well worth watching.

Joining Mitred Squares Together

Once you’ve made several squares, the exciting part begins: joining them together into a larger piece. There are a few different methods, and the one you choose will affect both the look and the feel of the finished project.

Mattress stitch is a popular choice for joining knitted pieces because it creates a nearly invisible seam on the right side of the work. You work with a tapestry needle and yarn, picking up stitches along the edges of two adjacent squares and drawing them together. The seam is worked on the wrong side.

A three-needle cast-off is another option that’s often demonstrated in video tutorials. This method joins two live sets of stitches simultaneously and creates a strong, neat seam, though it requires both pieces to have live stitches, which is only possible if you’re picking up and knitting each new square directly from the edge of the previous one — a technique common in more advanced modular knitting.

For pure beginners, the simplest approach is often to use a crochet slip stitch along the edges of two squares. Even if you don’t know how to crochet, this is a single, simple stitch that takes about five minutes to learn, and it creates a flat, firm join that holds the squares together neatly. Many knitting video tutorials will demonstrate this option precisely because it’s so accessible.

Project Ideas for Your First Mitred Squares

The beauty of learning mitred squares is that even your very first square is a finished object. A single square knitted in cotton yarn makes a charming dishcloth or face cloth. Two squares seamed together create a small coaster or a pot holder. Four squares arranged in a pinwheel pattern produce a beautiful small cushion cover.

As you become more comfortable with the technique, you might try a baby blanket made from sixteen or twenty-five squares in a soft palette of colours. This is a perennial favourite for new knitters because the project breaks down into manageable chunks — you’re never knitting “a whole blanket,” you’re just knitting one more square — and the finished result looks impressively complex and thoughtful.

Full-size throws and lap blankets made entirely from mitred squares are among the most beloved projects in the entire knitting community. Some knitters spend years working on these projects, adding a few squares at a time using odds and ends of yarn in whatever colours they happen to have on hand. The randomness of the colour placement, paradoxically, often produces strikingly beautiful results.

How to Find the Best Beginner Mitred Square Video Tutorials

When searching for video tutorials, a few search terms reliably turn up good results. “Beginner mitred square knitting tutorial,” “how to knit a mitred square step by step,” “mitred square knitting for beginners,” and “modular knitting mitred square” are all worth trying on YouTube. Sort results by view count or rating to surface the tutorials that the wider knitting community has found most useful.

Pay attention to the length of the tutorial. For a complete beginner, a video between fifteen and thirty minutes long is usually ideal — long enough to cover the technique thoroughly, short enough to maintain attention. Videos with chapters or timestamps are particularly helpful because you can skip back to the cast-on section or the decrease explanation without having to scrub through the entire video.

Don’t hesitate to watch two or three different tutorials before you cast on for the first time. Different creators explain things in different ways, and a concept that doesn’t quite click in one video might become crystal clear when someone else demonstrates it. Comments sections under knitting tutorials are often filled with questions, answers, and tips from fellow beginners, and reading through them can answer questions you didn’t even know you had.

A Few Final Encouragements

Every knitter who now works mitred squares with confident ease was once a beginner sitting with a skein of yarn and a set of needles, watching a video for the first time and feeling slightly baffled by it all. The technique looks more complicated than it is. Once you’ve worked your first decrease and watched that diagonal line begin to emerge from the fabric, the whole thing will make sense in a way that no written description can quite capture.

Be patient with yourself on the first square. It will probably take longer than you expect, and you may make mistakes that require you to rip back and start again. That’s normal, and it’s part of learning. The second square will be noticeably faster. The third will feel almost automatic. By the time you’ve made five or six, you’ll be knitting mitred squares while barely glancing at your work.

The knitting community is enormously welcoming to beginners, and video tutorial creators in particular tend to be passionate teachers who genuinely want you to succeed. Leave comments, ask questions, and share your progress. Knitting is not just a craft; it’s a community, and mitred squares have a particularly devoted corner of that community ready to welcome you in.

So find a video tutorial that appeals to you, gather your yarn and needles, and cast on. That first diagonal line is waiting to appear, and when it does, you’ll understand exactly why knitters find this simple, ancient technique so endlessly satisfying.