5 Mitered Squares Pillow Cover Free Knitting Patterns

There is something wonderfully satisfying about knitting a mitered square. The way the stitches decrease toward a central diagonal, forming that neat, geometric shape, gives even a beginner knitter a sense of real accomplishment. Now imagine combining five of those squares into a single, cohesive pillow cover — suddenly you have a project that is both visually striking and entirely approachable, no matter where you are in your knitting journey.

Mitered square pillow covers have been having a moment in the crafting community, and for good reason. They let you play with color in a way that few other patterns do. You can use up scraps from your yarn stash, experiment with bold color blocking, or create subtle gradient effects simply by switching colors between squares. The modular construction also means you can put the project down between squares without losing your place, making it ideal for busy knitters who only have a few minutes here and there to work.

In this post, we are sharing five completely free mitered square pillow cover knitting patterns, each one offering a slightly different approach to this classic construction. Whether you prefer minimalist modern aesthetics or cozy cottage charm, there is a pattern here for you. We will walk through each design in detail, discuss yarn and needle suggestions, and share tips for assembling and finishing your pillow covers so they look polished and professional every time.

What Is a Mitered Square, and Why Is It Perfect for Pillow Covers?

Before diving into the patterns themselves, it helps to understand what makes a mitered square different from an ordinary knitted square. A standard knitted square is worked in rows from one edge to the other, with all the shaping coming from the number of cast-on stitches. A mitered square, by contrast, begins with a much larger number of stitches and decreases steadily toward the center, creating a diagonal line that bisects the square from corner to corner.

This central decrease line is the heart of the mitered square. It gives the fabric a beautiful dimensional quality, a gentle ridge or valley running across the piece that adds texture and visual interest. When you join multiple mitered squares together, those diagonal lines create secondary patterns — diamonds, zigzags, pinwheels, and more — depending on how you orient each square.

For pillow covers specifically, the mitered construction offers some practical advantages too. The fabric tends to be dense and stable because of how the stitches are stacked, which means your pillow cover will hold its shape well even after years of use. Seaming multiple squares is also much more forgiving than seaming large pieces of fabric, since each join is short and manageable.

Before You Begin: General Tips for All Five Patterns

A few notes apply across all five of these free patterns, so it is worth reading through them before you cast on for any of them.

Gauge matters more than you think. Because pillow covers need to fit a specific insert, getting gauge right is important. Most standard pillow inserts come in sizes like 18×18 inches, 20×20 inches, or 16×16 inches. Before you start knitting, swatch your yarn and needles, measure your swatch carefully, and adjust needle size as needed to match the pattern gauge.

Choose your yarn wisely. All five patterns below work beautifully in wool, cotton, acrylic, or blends. Wool and wool blends are wonderfully forgiving and have natural elasticity that makes seaming easier. Cotton gives a crisp, structured finish that works well for modern aesthetics. If you plan to use the pillow in a high-traffic area or wash it frequently, a superwash wool or a washable cotton-acrylic blend is a smart choice.

Weave in ends as you go. Mitered square projects involve a lot of color changes, which means a lot of yarn ends. Get into the habit of weaving in ends as you finish each square rather than saving them all for the end. Your future self will thank you.

Use a stretchy bind-off. When binding off the final stitches of each square, use a stretchy method such as the Jeny’s Surprisingly Stretchy Bind-Off or a simple yarn-over bind-off. This keeps the edges flexible and makes seaming much easier.

Pattern 1: The Classic Five-Square Layout

This first pattern is the most straightforward of the five, making it the ideal starting point for knitters who are new to mitered construction. Five equal squares are knitted separately, then joined in a plus or cross arrangement — one square in the center, and one on each of the four sides. When the outer squares are folded up and seamed, they form the front and sides of the pillow, with the center square becoming the back face or the front face depending on your preference.

Materials needed: Approximately 300 yards of worsted weight yarn in a main color, plus 150 yards total in one or two contrast colors. US size 7 (4.5mm) straight or circular needles. A tapestry needle for seaming. One 18×18 inch pillow insert.

Gauge: 18 stitches and 36 rows per 4 inches in garter stitch.

Instructions for each square: Cast on 73 stitches. Set up row (wrong side): Knit across. Row 1 (right side): Knit to 1 stitch before the center stitch, slip 2 stitches together knitwise, knit 1, pass the 2 slipped stitches over. Knit to end. Row 2 (wrong side): Knit across. Repeat Rows 1 and 2 until 3 stitches remain. Final decrease: Slip 2 stitches together knitwise, knit 1, pass the slipped stitches over. Break yarn and pull tail through remaining stitch. Each finished square should measure approximately 9 inches from corner to corner along each edge.

Once all five squares are complete, lay them out in a cross shape and seam using mattress stitch or whip stitch. Fold the four outer squares up along the seam lines, join the side edges to form a box shape, and insert your pillow form. Seam the final edge closed, or add a simple button band for a removable cover.

Pattern 2: The Color Block Rainbow Cover

This pattern takes the same basic mitered square construction and turns up the color volume. Each of the five squares is worked in a different solid color — think a warm palette of rust, mustard, terracotta, cream, and sage, or a cool palette of navy, sky blue, mint, grey, and white. The result is a bold, graphic pillow cover that functions almost like a piece of textile art.

Materials needed: Approximately 100 yards each of five different worsted weight colors. US size 7 (4.5mm) needles. Tapestry needle. One 18×18 inch pillow insert.

Gauge: Same as Pattern 1.

The squares are knitted exactly as described in Pattern 1, with each square worked entirely in its own color. The key design choice here is in the arrangement and orientation of the squares. Try rotating alternating squares 90 degrees before seaming so the decrease ridge runs in different directions. This creates a subtle pinwheel effect when the squares are joined, even though the colors themselves are solid.

For the back of the cover, you have several options. Knit a sixth square in a neutral color to serve as a plain back panel, or knit two rectangles and overlap them to create an envelope-style back opening that lets you remove and wash the cover. The envelope back is particularly practical and requires no buttons or zippers.

Pattern 3: The Two-Color Striped Squares Cover

If you love the graphic impact of mitered squares but want to add even more visual texture, this striped version is for you. Each square is knitted in two alternating colors, with the stripes running parallel to the decrease ridge and creating a chevron-like effect within each square.

Materials needed: Approximately 200 yards of worsted weight yarn in Color A, and 200 yards in Color B. US size 7 (4.5mm) needles. Tapestry needle. One 18×18 inch pillow insert.

Gauge: Same as Pattern 1.

Modified square instructions: Cast on 73 stitches with Color A. Work the setup row and Rows 1-2 as before. On Row 3, join Color B and work Rows 3-4 in Color B. Continue alternating between Color A and Color B every 2 rows. Carry the unused color loosely up the side of the work rather than breaking it each time, keeping floats loose enough to avoid puckering.

The two colors do not need to be high contrast to be effective. A deep teal paired with a slightly lighter teal creates a sophisticated tonal effect. A creamy white paired with a warm tan reads as modern and neutral. High contrast pairs like black and white or navy and yellow make a bolder statement. Knit a few test squares in different color combinations before committing to one, and you may find a pairing you had not expected to love.

For the assembly, try alternating the orientation of the squares as you join them. When two striped squares are joined with their decrease ridges meeting at a point, the stripes create a continuous diamond shape across the seam. This kind of accidental geometry is one of the most delightful surprises in mitered square knitting.

Pattern 4: The Gradient Ombre Pillow Cover

This pattern is a yarn stash knitter’s dream. It uses small amounts of multiple colors blended across the five squares to create a gentle ombre gradient that moves from dark to light — or from one hue to another — across the whole pillow face.

Materials needed: Approximately 50-80 yards each of five to seven colors that transition smoothly from one end of the spectrum to the other. Worsted weight. US size 7 (4.5mm) needles. Tapestry needle. One 18×18 inch pillow insert.

Gauge: Same as Pattern 1.

The key to making this pattern work is planning your color progression before casting on. Lay your yarn skeins or balls out in order and look at them together. Do they flow naturally from one to the next, or are there any jarring jumps in value or tone? Rearrange as needed until the transition feels smooth.

Square 1 is worked entirely in the darkest color. Square 2 introduces the second color, starting with a few rows of the darkest color and fading into the second. Square 3 is worked entirely in the middle color. Square 4 mirrors Square 2 in reverse, transitioning from the middle color into the second-to-lightest. Square 5 is worked entirely in the lightest color.

Arrange the five squares in a row for the front panel, with the darkest square at one end and the lightest at the other. This horizontal gradient layout is especially effective. You can also arrange them diagonally for a chevron-like gradient movement, which takes a little more planning but creates a genuinely stunning finished object.

Pattern 5: The Textured Single-Color Cover

Not every mitered pillow cover needs to be about color. This final pattern proves that a single, beautifully chosen yarn in one solid or semi-solid color can make an equally striking pillow when the texture does the talking.

Materials needed: Approximately 400-450 yards of a textured or semi-solid worsted weight yarn. Tweedy wools, heathered yarns, and hand-dyed semi-solids all work beautifully here. US size 7 (4.5mm) needles. Tapestry needle. One 18×18 inch pillow insert.

Gauge: Same as Pattern 1.

The five squares are worked exactly as in Pattern 1, but in this version the focus is entirely on the interplay between the decrease ridges and the yarn itself. Because all five squares share one color, the diagonal lines created by the mitered decreases become the primary visual feature. When you join the squares and arrange them with alternating orientations, those ridges form an eye-catching pinwheel pattern that looks far more complex than the simple construction actually is.

To add even more interest, try working two of the five squares in reverse stockinette rather than garter stitch. The contrast between the smooth face of the stockinette squares and the ridged surface of the garter squares adds a subtle tactile depth that is especially beautiful in person.

Finishing Your Pillow Cover

Regardless of which pattern you choose, the finishing steps are largely the same. Block each individual square before seaming by wetting it thoroughly, gently squeezing out the excess water (never wring), and pinning it to your measurements on a blocking mat. Let it dry completely. Blocking evens out any inconsistencies in your tension and makes the final seaming much cleaner.

For seaming, mattress stitch is the classic choice and creates an almost invisible join that lies flat against the pillow. If you prefer a more decorative finish, a three-needle bind-off creates a raised ridge on the right side that can be an intentional design element. A simple whip stitch in a contrast color can also look deliberately folk-art-inspired and charming.

Insert your pillow form before closing the final seam, and make sure you are using an insert that is one inch larger than your finished cover. A slightly overstuffed pillow looks much better than one that is too small for its cover, which tends to look limp and sad.

Ideas for Customizing Any of These Patterns

Part of the joy of free knitting patterns is that they are starting points, not rules. All five of these pillow cover patterns invite customization and experimentation.

You can adjust the size of each square by casting on more or fewer stitches. Every additional 8 stitches adds roughly an inch to the finished square, so casting on 89 stitches instead of 73 will give you a square roughly 2 inches larger in each dimension. This scales up easily for larger pillow inserts.

You can also change the yarn weight. The patterns above are written for worsted weight, but they translate well to DK weight (with smaller needles and more stitches) or bulky weight (with larger needles and fewer stitches). Just swatch and adjust accordingly.

Adding a simple border to the assembled pillow front is another easy customization. Pick up stitches around the perimeter of the joined squares and work a few rounds of garter stitch, seed stitch, or a simple eyelet row. This frames the patchwork beautifully and gives the cover a finished, intentional look.

Final Thoughts

Mitered square pillow covers occupy a sweet spot in the knitting world — they are meditative enough to be relaxing but structured enough to stay interesting, modular enough to be portable but complex enough to produce something genuinely beautiful. Any of these five free patterns will get you there, and the best part is that once you have knitted your first mitered square, you will understand the construction so deeply that you will start seeing opportunities to use it everywhere.

Cast on, enjoy the process, and do not be surprised if one pillow cover quickly becomes two, then three, and then a whole collection brightening up every couch and chair in your home.