Simple & Easy Crochet Granny Square Cardigan Pattern

There’s something timeless about a granny square. It’s one of the first things many crocheters ever learn, a little motif that feels approachable and forgiving, full of color possibilities and nostalgia. But granny squares have grown up. What once lived mostly in afghans and throw pillows has found its way into one of the most beloved garment styles in the crochet world: the cardigan. If you’ve been wanting to make your very own crochet granny square cardigan but felt intimidated by garment construction, this is the pattern for you. This guide walks you through everything — materials, gauge, construction method, step-by-step instructions, and finishing tips — so you can create a beautiful, wearable sweater from simple squares.

Why a Granny Square Cardigan?

Granny square cardigans have surged in popularity over the last few years, and it’s easy to understand why. They’re modular, meaning you build the garment one square at a time rather than knitting or crocheting an entire sweater panel in one go. This makes the project incredibly portable. You can work on individual squares during a commute, while watching TV, or in small pockets of time throughout your day. There’s no need to lug around a giant in-progress garment.

Beyond portability, granny square cardigans are endlessly customizable. You can use a single color for a sleek, modern look, or pull from your entire stash of scraps to create a vibrant, eclectic piece. You can adjust the size simply by changing the number of squares you use or by altering the size of each individual square. And because the construction is essentially flat assembly rather than complex shaping, this style of cardigan is genuinely accessible even to beginners who are comfortable with the basic granny square.

The finished result is a garment that feels boho and relaxed, with an open, airy drape that works beautifully in spring, fall, and layering situations throughout winter. It’s the kind of piece that gets worn constantly because it goes with everything.

Materials You’ll Need

Before you cast on — or rather, before you make your foundation chain — gather your supplies. Having everything ready makes the process smooth and enjoyable.

Yarn: For a beginner-friendly project with great drape, a DK weight or worsted weight yarn in a cotton or cotton-blend works beautifully. Cotton gives the cardigan structure without being stiff, and it holds color well. If you want a softer, cozier feel, an acrylic or wool-acrylic blend works wonderfully too. For a standard women’s medium cardigan, you’ll need approximately 1,000 to 1,400 yards of yarn depending on your gauge and finished size. If you’re making a colorful scrappy version, simply ensure your total yardage falls within that range.

Hook: A 5mm (US H/8) crochet hook is a great starting point for worsted weight yarn. If you’re working with DK weight, try a 4.5mm or 4mm hook. Always make a gauge swatch before starting.

Notions: You’ll need a yarn needle for seaming and weaving in ends, scissors, stitch markers, and a tape measure. Optionally, blocking mats and pins make a significant difference in the final look of your cardigan.

Understanding Gauge

Gauge determines the finished size of your garment, so it’s worth taking seriously even if you typically skip this step. For this pattern, the target gauge is one 4-inch granny square using worsted weight yarn and a 5mm hook. Each finished square should measure approximately 4 inches by 4 inches after a light block.

If your square is larger than 4 inches, go down a hook size. If it’s smaller, go up a hook size. Once your gauge is correct, you can calculate how many squares you’ll need for your desired size.

Sizing Chart

This pattern is worked in a one-size-fits-most format, but it’s easily adjustable. Here’s a quick reference for how many squares you’ll need at the 4-inch gauge for different sizes.

For a small/medium (bust 34–38 inches), you’ll need approximately 80 squares. For a medium/large (bust 38–42 inches), plan for around 96 squares. For a large/XL (bust 42–46 inches), you’ll need approximately 112 squares. These numbers account for the body panels and sleeves. We’ll discuss layout in detail in the construction section.

How to Make the Basic Granny Square

If you already know the classic granny square, this is the version you know. If it’s new to you, here’s a simple breakdown.

Foundation Ring: Start with a magic ring or chain 4 and slip stitch to form a ring.

Round 1: Chain 3 (counts as first double crochet), work 2 double crochets into the ring. Chain 2, then work 3 double crochets into the ring. Repeat the chain-2 and 3-double-crochet cluster two more times. Join with a slip stitch to the top of your starting chain-3. You now have four clusters separated by chain-2 corners. (4 clusters, 4 corner spaces)

Round 2: Slip stitch into the corner space. Chain 3, work 2 double crochets into the same corner. Chain 1. Work 3 double crochets, chain 2, 3 double crochets into the next corner space. Chain 1. Continue around in this manner — 3 double crochets into each corner with a chain-2 at each corner, and chain-1 spaces between clusters on the sides. Join with a slip stitch. (8 clusters total)

Round 3: Slip stitch to the corner space. Chain 3, 2 double crochets in corner, chain 2, 3 double crochets in same corner. Chain 1. Three double crochets in the side chain-1 space. Chain 1. Three double crochets, chain 2, three double crochets in the next corner. Continue around. Join with a slip stitch. (12 clusters total)

This 3-round square will measure approximately 4 inches at the described gauge. If you want larger squares — for example, 6-inch squares for a quicker make — add a fourth round following the same logic: adding one more cluster on each side between corners.

Fasten off after each square and weave in your ends, or use the join-as-you-go method described below.

Construction Method: How to Build the Cardigan

The beauty of this pattern is in its construction. You’re essentially arranging squares into rectangles to form the body and sleeves of the cardigan. No complicated shaping, no increases or decreases in unusual places. Just squares laid out intentionally.

The Back Panel: The back of the cardigan is a rectangle of squares. For a small/medium at 4-inch squares, arrange 5 squares wide by 5 squares tall, giving you a back panel that’s approximately 20 inches wide and 20 inches tall. Adjust this for larger sizes by adding a square to the width.

The Front Panels: Each front panel is half the width of the back. For the small/medium, each front panel is 2.5 squares wide, but since you can’t use half squares, you’ll work each front panel 2 squares wide and add a border later to reach the correct proportions. Alternatively, you can work each front panel 3 squares wide for a more generous overlap. At 4 inches each, the 3-square-wide front panel gives you a 12-inch front panel on each side. For a cardigan that falls open without buttons, this creates a lovely relaxed silhouette.

Each front panel is also 5 squares tall to match the back.

The Sleeves: Each sleeve is a rectangle of squares. For a comfortable, slightly oversized sleeve, work 3 squares wide by 4 squares tall for the small/medium. This gives you a sleeve panel that’s 12 inches wide and 16 inches long. When seamed into a tube and attached to the shoulder, it creates a comfortable drop-shoulder sleeve.

Assembling the Panels: Once all your squares are crocheted, lay them out flat on a surface to arrange your color placement if you’re using multiple colors. This is one of the most satisfying steps — seeing the cardigan take shape as a patchwork of color before it’s even sewn together.

Join your squares using the flat slip stitch join or the join-as-you-go method. For the flat slip stitch join, hold two squares with wrong sides together and slip stitch through both sets of edge stitches. This creates a visible ridge on the right side, which is a classic design feature of granny square garments and adds lovely texture. If you prefer an invisible join, use the mattress stitch with your yarn needle.

Once your squares are joined into panels, seam the back panel to the two front panels at the shoulder seams, leaving an opening in the center for the neck. The shoulder seams are typically 5 to 6 inches on each side.

Fold the sleeve panels in half lengthwise and seam the long edge to form a tube. Then set the sleeve into the armhole opening and seam in place. The armhole is simply the open edge between the shoulder seam and the side of the body.

Finally, seam the side seams from the bottom hem up to the underarm, and seam the sleeve tube from the underarm down to the cuff. You now have a fully constructed granny square cardigan.

Adding the Border

The border is where your cardigan really comes to life. A simple single crochet border worked around the entire outer edge — up one front panel, around the neck, down the other front panel, and along the hem — ties everything together and gives the piece a polished finish.

To work the border, attach your yarn at the bottom hem on one front panel. Work single crochet evenly around, placing 3 single crochets in each outer corner to help the corners lie flat, and decreasing slightly at inner corners (such as where the neck meets the front panels) by working a single crochet decrease or simply skipping one stitch. Work 2 to 3 rounds of single crochet in your border color, or alternate colors for a striped border.

For the cuffs, work a similar single crochet border around the sleeve opening. This also helps define the edge and prevents curling.

If you want to add a button band, work the front border with extra height — about 5 rounds — and use the natural spaces in the crochet fabric as buttonholes. Alternatively, add separate loops on one panel and sew buttons onto the other.

Finishing Touches

Blocking your finished cardigan makes an enormous difference. Wet blocking is ideal for cotton yarns: soak the finished garment in cool water for about 20 minutes, gently press out excess water without wringing, and lay flat on blocking mats. Use pins to open up the squares, straighten the edges, and achieve a clean rectangular shape. Allow to dry completely before wearing.

For wool or wool-blend yarns, steam blocking works beautifully. Hold a steam iron a few inches above the surface of the garment and allow the steam to relax the fibers without pressing down.

Once blocked and dry, weave in any remaining ends securely. If you’ve already woven in ends as you went, you’ll have very little left to do at this stage.

Tips for Success

Working a granny square cardigan is a joy, but a few tips can make your experience even smoother.

Work your tension consistently. Granny squares that vary in tension will create panels that don’t lie flat when joined. If you find your tension changes between sitting and standing, or at the beginning versus end of a session, try to crochet all squares for a single panel in similar conditions.

Join as you go to save time. The join-as-you-go method attaches each new square to completed squares as you finish the final round, eliminating the need for a separate seaming step. There are many tutorials available for this technique, and once you learn it, you’ll likely never go back.

Label your squares. If you’re working a complex color arrangement, lay out your squares in the intended arrangement and photograph it before you begin joining. This prevents the frustration of seaming panels together and realizing colors are out of order.

Swatch your square before committing. Blocking can change the size of a granny square significantly, especially in cotton. Make one square, block it, measure it, and confirm your gauge before making all 80 or more squares for your project.

Customization Ideas

One of the greatest pleasures of the granny square cardigan is how much creative freedom it gives you. Here are some ways to make the pattern your own.

Try a solid color version using two contrasting yarns — one for the inner rounds and one for the outer round. This creates a cohesive, modern look rather than a scrappy patchwork feel. Colors like rust and cream, or sage and oatmeal, are particularly popular for this aesthetic.

Make your squares larger to reduce the overall square count and create a chunkier, more dramatic look. Six-inch squares worked to four rounds bring a bold graphic quality to the finished garment.

Experiment with different square shapes. Half-granny squares can be used at the edges of panels to create straight edges without needing a border. Solid granny squares — worked without the open chain spaces — give a denser fabric that works well for cooler weather.

Add fringe along the hem or cuffs for a bohemian touch. Simply cut lengths of yarn, fold them in half, and pull the loop through an edge stitch with your hook, then pull the ends through the loop to secure.

Caring for Your Cardigan

Your granny square cardigan will last for years with proper care. For cotton yarns, machine washing on a gentle cycle in cool water is usually fine, but always check your yarn label. Lay flat to dry rather than hanging, as wet yarn is heavy and hanging can distort the shape of the garment.

For wool or blended yarns, hand washing in cool water with a wool wash is safest. Press gently to remove water and lay flat to dry. Avoid agitation, which can cause felting.

Store your cardigan folded rather than on a hanger, particularly during off-seasons. This preserves the shape and prevents stretching at the shoulders.

Final Thoughts

A granny square cardigan is one of those projects that gives back generously. Each small square is a quick win, a moment of satisfaction that keeps you moving forward through the project. And when you finally seam those panels together and slip the finished garment on, the sense of accomplishment is immense. You’ve made an actual wearable piece of clothing from yarn and a hook and a stitch you probably learned in your first week of crocheting.

Whether you’re pulling from your stash to make something colorful and scrappy, or carefully selecting a curated palette for a clean, intentional look, this pattern adapts to your vision. It’s the kind of project you’ll want to make again in every color combination, for yourself and for everyone you love.

So gather your yarn, choose your hook, and start on that first square. Before you know it, you’ll have a closet full of cardigans you made yourself.