Crochet Granny Square Cardigan: Free Pattern + Video Tutorial

There is something about a granny square that never goes out of style. It is one of those motifs that has traveled through generations of crafters, appeared on runways, filled vintage shop racks, and made a stunning comeback in modern handmade fashion. If you have been wanting to combine the nostalgic charm of granny squares with a wearable, stylish garment, this crochet granny square cardigan is exactly the project you have been looking for.

This free pattern walks you through every step of creating a beautiful, boho-inspired cardigan made entirely from individual granny squares joined together. Whether you are a confident beginner who already knows how to make a basic granny square or an experienced crocheter looking for a fun construction project, this pattern is written to guide you clearly from your first stitch to the finished garment. A video tutorial is also included to help you follow along visually at each key stage.

Let’s dive in.

Why Granny Square Cardigans Are So Popular Right Now

Granny square garments have been all over social media platforms, fashion blogs, and craft communities for the past few years, and the trend shows no sign of slowing down. The reason they capture so much attention is simple: they are endlessly customizable, beginner-accessible, and portable in a way that most garment construction is not.

Unlike knitting or crocheting a sweater in pieces that require precise shaping, granny square cardigans are built modularly. You make individual squares, then join them. This means you can pick up and put down your project without losing your place. You can work on squares while watching television, traveling, or waiting anywhere. When you have enough squares, you assemble them into a garment.

There is also something deeply satisfying about seeing a pile of individual motifs transform into something you can actually wear. Each square is its own small accomplishment, and collectively they become something remarkable.

Materials You Will Need

Before you begin, gather everything listed below. Having your materials ready before you start will make the entire process smoother.

Yarn: For a standard adult cardigan, you will need approximately 800 to 1,200 yards of worsted weight yarn (category 4). This project is ideal for using up stash yarn in multiple colors, or you can choose two to four coordinating colors for a more intentional palette. Natural fibers like cotton and cotton blends work beautifully for spring and summer cardigans, while acrylic or wool blends give you a cozier drape for fall and winter wear.

Hook: A 5.0mm (US H/8) crochet hook is recommended for worsted weight yarn, but always check your gauge and adjust if needed.

Notions: Yarn needle for weaving in ends and joining squares, scissors, stitch markers, measuring tape, and buttons if you want closures on the front of your cardigan.

Gauge: Each finished granny square should measure approximately 4 inches by 4 inches after blocking. It is important to check this before committing to the full project, because your square size determines your cardigan size.

Sizing Guide

This pattern is written for a finished garment with a relaxed, oversized fit. Granny square cardigans look best with some ease, so they drape loosely over the body rather than fitting snugly.

The measurements below reflect the finished garment dimensions, not body measurements. Choose a size based on how much ease you prefer.

Small/Medium: Chest circumference approximately 42–44 inches, length approximately 24 inches. You will need approximately 40 to 48 granny squares.

Large/Extra-Large: Chest circumference approximately 46–50 inches, length approximately 25–26 inches. You will need approximately 48 to 56 granny squares.

2X/3X: Chest circumference approximately 52–56 inches, length approximately 27 inches. You will need approximately 56 to 64 granny squares.

If your squares are measuring slightly larger or smaller than 4 inches, your square count will shift accordingly. This is completely fine — the pattern is built on a modular grid, so as long as you know your square dimensions, you can adapt the layout.

The Classic Granny Square: Free Pattern

This is the traditional three-round granny square. If you already know how to make this motif, feel free to skip ahead to the cardigan construction section.

Abbreviations:
ch = chain
sl st = slip stitch
sc = single crochet
dc = double crochet
sp = space
rep = repeat

Round 1: Make a magic ring (or ch 4 and join with sl st to form a ring). Ch 3 (counts as first dc), work 2 dc into the ring. Ch 2. Work 3 dc into the ring, ch 2. Repeat from * two more times. Join with sl st to the top of the beginning ch-3. You now have four groups of 3 dc with ch-2 corner spaces between them. Pull the tail of your magic ring to close the center.

Round 2: Sl st into the corner ch-2 space. Ch 3 (counts as dc), work 2 dc into the same corner space. Ch 2 (corner made). Work 3 dc into the same corner space. Work 3 dc into the side space between the corners. Then into the next corner ch-2 space, work 3 dc, ch 2, 3 dc. Repeat from * around. Join with sl st to the top of beginning ch-3.

Round 3: Sl st into the corner ch-2 space. Ch 3, work 2 dc into the same corner space. Ch 2, work 3 dc into the same corner space. Work 3 dc into each side space across. Into the next corner ch-2 space, work 3 dc, ch 2, 3 dc. Repeat from * around. Join with sl st to the top of beginning ch-3. Fasten off and weave in ends.

Your finished square should be neat and flat. If it is curling, your tension may be too tight. If it is ruffling, your tension is too loose. Block your squares by dampening them and pinning them flat to a foam board or towel. Let them dry completely for the flattest, most uniform results.

Cardigan Construction: Step by Step

Once you have made all of your squares and blocked them, the construction phase begins. This is the stage that most crocheters find both exciting and slightly intimidating, especially if they have never assembled a square-based garment before. Take it one step at a time.

Step 1: Understand the Layout

A granny square cardigan is essentially a rectangle with a center opening in the front. Think of the body as a grid of squares laid out flat. The back panel is a continuous rectangle of joined squares. The front panels are two smaller rectangles that sit on either side of the center front opening. The sleeves are tubes of joined squares that attach at the shoulders.

For a Small/Medium cardigan using 4-inch squares, a basic layout might look like this: The back panel is six squares wide and five squares tall. Each front panel is three squares wide and five squares tall. Each sleeve is four squares wide and four squares tall. This gives you a classic, boxy silhouette.

Step 2: Join Your Squares

There are several methods for joining granny squares, and the method you choose will affect the look of your finished cardigan. The three most popular options are the flat slip stitch join, the join-as-you-go method, and the flat single crochet join.

The flat slip stitch join creates a nearly invisible seam. Hold two squares with wrong sides facing each other and slip stitch through both outer loops of corresponding stitches across one edge. This creates a subtle ridge on the wrong side of the fabric.

The flat single crochet join is similar but creates a slightly raised ridge on the right side of the work, which can be used decoratively when done in a contrasting color.

The join-as-you-go method involves joining each new square to existing squares during the final round rather than sewing or crocheting them together afterward. This eliminates seaming entirely and is a wonderful technique once you get comfortable with it.

For a beginner-friendly approach, the flat single crochet join works beautifully and produces a sturdy, attractive seam.

Step 3: Assemble the Back Panel

Begin by joining your squares into rows. For the back panel, join six squares horizontally to create your first row. Then join the next row of six squares. Continue row by row until your back panel is complete. Then join the rows together to form the full back rectangle.

Step 4: Assemble the Front Panels

Repeat this process for each front panel. You will have two separate front panels — one for the left front and one for the right front.

Step 5: Join Panels at the Shoulders

Lay your back panel flat. Place one front panel on top of it, right sides together, aligning one short upper edge of the front panel with the corresponding section of the back panel’s upper edge. Join them with your preferred seam method across the shoulder edge, leaving the center portion of the back panel’s upper edge open for the neckline. Repeat for the other shoulder and front panel.

Step 6: Attach the Sleeves

If you are making full sleeves, join your sleeve squares into a flat rectangle first, then fold the rectangle and join the long edges together to form a tube. Attach the open end of the sleeve tube to the armhole opening at the shoulder of the body, easing any fullness evenly around the armhole edge.

For a three-quarter or short sleeve, simply use fewer squares in the sleeve length.

If you prefer a sleeveless vest-style cardigan, you can skip the sleeves entirely and simply add a single crochet border around the armhole openings.

Step 7: Side Seams

Join the front and back panels along the side edges, leaving your desired amount open at the bottom for a side slit if you like. A small side slit of one to two squares creates a flattering, comfortable opening that makes the cardigan easier to wear.

Adding the Finishing Touches

A well-finished cardigan makes all the difference. This is where your garment goes from a collection of joined squares to a polished, wearable piece.

Neckline Border: Using your main color or a contrasting border color, work one or two rounds of single crochet evenly around the neckline opening. This tidies the raw edges and gives the neckline a clean, professional look.

Front Border: Work one or two rounds of single crochet along each front edge, from the bottom hem up to the neckline. This stabilizes the front opening and gives you the option to add button loops. If you want to add buttons, space your button loops evenly along one front edge during your border round, then sew buttons to the corresponding positions on the opposite front edge.

Hem Border: Work a round of single crochet along the bottom hem of the cardigan to finish the lower edge. You can also add a picot edge, shell stitch border, or ribbed cuff to the sleeve ends for extra detail.

Blocking the Finished Garment: Once all finishing is complete, wet block your cardigan by soaking it in cool water, gently pressing out excess water, and laying it flat to dry in the desired shape. Blocking evens out the stitches, relaxes the joins, and gives the entire garment a cohesive, finished appearance.

Video Tutorial

A written pattern is a wonderful reference, but video can make a world of difference when you are learning construction techniques for the first time. The video tutorial for this cardigan covers the following sections: how to make the basic granny square with tension tips, the flat single crochet join demonstrated step by step, the full layout and assembly of the body panels, attaching sleeves to the body, and working all finishing borders.

You can find the full video tutorial linked at the top of this post and embedded below the pattern. Pause, rewind, and follow along at whatever pace feels comfortable for you. If you have questions not answered in the video, leave a comment and the answer will be added to the FAQ section at the bottom of this page.

Tips for Customizing Your Cardigan

One of the greatest joys of a granny square cardigan is how freely you can make it your own.

Color Play: A rainbow cardigan made with a different color in each square’s center is a show-stopping design choice. Alternatively, a tonal cardigan using three shades of the same color creates a sophisticated, understated look. A two-color design — one color for the square centers and rounds, another for the border and joins — gives you a clean, graphic aesthetic.

Square Size Variations: Using larger squares (five or six rounds instead of three) means you need fewer squares and the project comes together faster. Using smaller squares creates a denser fabric with more seam texture.

Mixed Motifs: You do not have to use all granny squares. Solid granny squares (worked in all double crochet without the open spaces) create a different texture. Sunburst squares, flower squares, and solid squares can be mixed within the same grid as long as they all measure the same finished size.

Length Options: Add extra rows of squares to make a longline cardigan. Remove a row to make a cropped version. The modular construction makes length adjustments simple and painless.

Frequently Asked Questions

How long does it take to make a granny square cardigan?

Most crafters working at a relaxed pace complete this project in two to four weeks, spending a few hours per week. If you work more intensively, you can finish it in a single week. The individual squares are very portable, which makes it easy to add stitches during small windows of time throughout your day.

Can I use leftover yarn from other projects?

Absolutely. This is one of the best stash-busting projects in crochet. As long as all of your yarns are approximately the same weight and fiber content, mixing different brands and dye lots will give you a charming, eclectic result.

What if my squares are not all exactly the same size?

Blocking is your best friend. Most small variations in square size can be resolved with careful wet blocking, pinning each square to the same dimensions before assembly. If the variation is significant, check your tension and consider switching hook sizes.

Is this pattern beginner-friendly?

The granny square itself is one of the most beginner-accessible crochet motifs. If you can chain, slip stitch, and work double crochet stitches, you can make this pattern. The construction is more intermediate in concept, but the video tutorial makes it very approachable for dedicated beginners.

Final Thoughts

Making a granny square cardigan is one of those crochet projects that rewards you at every stage. There is the satisfaction of completing each individual square, the fun of laying them out and playing with the color arrangement, and the deep pleasure of watching them come together into a garment you can actually wear out into the world.

This free pattern is yours to use, adapt, share with friends, and make entirely your own. If you make this cardigan, share a photo in the comments below or tag it on social media — seeing your finished creations is one of the best parts of publishing patterns, and your version might inspire someone else to pick up their hook and try it for the first time.

Happy crocheting.