Skip to main content

Quilting 101: How to Sew a Nine-Patch Block

I am a self-taught quilter, and I've sewn seriously since I was 14. I hope I can share some of the things I've learned through the years.

Learn how to sew a nine-patch block with these easy-to-follow steps.

Learn how to sew a nine-patch block with these easy-to-follow steps.

Quilt Block: Great Beginners' Project

The humble nine-patch is an essential quilt block. If this isn't your first block, it should be. As the name implies, it features nine patchwork squares arranged in a three-by-three grid, just let a chess board or tic-tac-toe square. It's easy to make, easy to get great results, and it can be used in various ways.

I'll show you the basics, plus methods for speeding up the process while making perfect nine-patch blocks that you can turn into a beautiful quilt. Let's get started!

Materials and Tools


  • 1 yard dark fabric
  • 1/2 yard light fabric
  • Thread


  • Rotary cutter or scissors (I like this rotary cutter)
  • Cutting mat
  • Marking tool (if desired)
  • Quilting ruler (see my recommendation below)
  • Cardboard cereal box template 4.5-inches wide (if not using a ruler)
  • Sewing machine
  • Iron
  • Pins
  • Basic sewing supplies
There are two methods for nine-patch assembly.

There are two methods for nine-patch assembly.

Nine-Patch Assembly: 2 Methods

The most obvious way to assemble a nine-patch block is to lay out nine individual squares. You would stitch together three squares to make a row and then stitch three rows together to create one block, but that's not the fastest way. Free-motion quilting instructor Angela Walters always recalls her husband's grandfather showing her how to quilt, cutting out all nine squares and stitching them together one by one. When she finished her first block, he said, "Now, let me show you the easy way," and whipped out the rotary cutter.

I just love that story because it truly pays to learn something the slower or more difficult way. Then, the proven method seems even easier. I still lay out all nine squares separately when piecing together five-inch charm pack squares to make a 14-inch pillow cover or another project using pre-cut fabric. However, I use the speedy strip piecing method when making nine-patch blocks for a quilt. Strip piecing is a quilting fundamental, and the nine-patch is a great way to discover and master this technique.

Quilting supplies

Quilting supplies

Quilting Fundamentals

Before you whip out your fabric and cutting tools, let's cover the basics. Since this tutorial is intended for beginners and first-time quilters, I'll assume that you don't know what I'm talking about when I mention flying geese, speed piecing, strip piecing, half-square triangles, and all kinds of quilter jargon. That's okay because I didn't get these terms either, and no one was born knowing how to quilt. Here's my motto: If you can sew, you're halfway to quilting.

Before you play the game, let's consider the rules.

My Quilting Rules

  1. Unless I'm using fat quarters, charm squares, jelly rolls, or other pre-cut fabrics, I always wash and pre-shrink my fabric. This is my preference. I definitely wash and shrink solid broadcloth because shrinkage rates vary—and you know how a quilt with variable shrinkage will look. If you're a fashion sewist, you probably remember the wash and dry it twice method. There's nothing wrong with that, but it seems wasteful to me. I've found that a single wash is fine as long as you use the longest dryer setting. The reasoning is that maximum shrinkage occurs when the last bit of moisture is removed. If necessary, open up the dryer and untangle your fabric to make sure that it is thoroughly dry.
  2. Starch is your friend. Starch and iron your fabric before cutting to minimize distortion.
  3. Always use a 1/4-inch seam allowance. Quilting is different than fashion sewing, where you're used to 5/8th seams. Most quilting techniques are designed to minimize excess bulk. Check and double-check your seam allowance to make sure it's really 1/4-inch. If you have a computerized sewing machine, use the stitch width selector to move the needle position, so you can use the edge of your presser foot as the seam guide. For my machine, I adjust the needle position to 4.5 mm. The seam allowance is super important to ensure that your blocks are the right size. If you can't get a true 1/4-inch seam, just be consistent.
  4. Before you press the seams open, iron the strips while they are flat. This fashion sewing tip helps set the seam before you press the strips open. Use starch to make the process easier.
  5. Press all seam allowances toward the darker fabric. If you don't, darker threads might peek through—no one wants that!

That's all of the basic rules that I can think of for now.

Scroll to Continue

Read More From Feltmagnet

Nine-Patch Measurements and Caluclations

This tutorial will show you how to make 12-inch quilt blocks using the nine-patch pattern. In quilting, 12-inch blocks are fairly standard because the measurements are easy to work with. The measurements refer to the finished size after the 1/4-inch seams have been eaten up on each side. Therefore, a 12-inch block would measure 12.5 inches square when it stands alone.

Since a nine-patch is made from three squares on each side (three times three equals nine), each square or strip should be 4.5 inches. After the seams are used up, three four-inch squares equal 12 inches.

If you'd rather make 9-inch blocks, start with 3.5-inch strips instead.

Units 1 and 2

Units 1 and 2

The Anatomy of a Nine-Patch Block

For this tutorial, we'll be using strip piecing to make lots of blocks quickly. As you may have noticed, each nine-patch block has three rows that are made from two units only. Unit 1 appears two times—on the top and on the bottom. Unit 2 is in the middle.

Units and How to Make Them

  • Unit 1 features two dark value squares separated by one light value square. (These values can be reversed if desired)
  • Unit 2 features two light value squares separated by one dark value square.

Strip piecing allows you to create pre-assembled rows. One series of strips can be sliced into pieces that represent Unit 1. The other series will be Unit 2.

Note: You'll need half as many light squares because the ratio of Unit 1 to Unit 2 is 2:1.


Strip Piecing and Assembly Instructions

For Unit 1, you'll need two dark -alue strips and one light strip.

For Unit 2, you'll need two light-value strips with one dark-value strip in the middle.

To create your strips, fold your fabric in half with the selvages together, and cut your first strip, making sure that it's 4.5 inches wide. Continue cutting 4.5-inch strips from both dark and light fabrics.

Note: To make eight blocks, you'll need four light strips and five dark strips. If you're using a half yard, don't pre-shrink the fabric to ensure that you have exactly 18 inches

Once you have three strips in each color, you can begin assembly. For Unit 1, two dark strips are on the outside, one light strip is on the inside. For Unit 2, two light strips are on the outside, and one dark strip is in the middle.

Each group of three strips will have two seams. Pin the strips together, and stitch from top to bottom using a 1/4-inch seam.

Nine patch strip piecing

Nine patch strip piecing

Slice and Dice

Now comes the interesting part. Once you have your three-strip groups assembled. Press the seams with the seam allowance going toward the dark strips. Repeat the process for both groups. Now, cut off the uneven edges, making sure that the cut is perpendicular to the long edge. Next, cut your first row of 4.5-inch strips. Repeat the process until you reach the end of the multi-strip group. Cut the other using the same method. Each slice represents one row of the nine-patch block.


Assemble Your Rows

Once you've cut your multi-strip groups into Units 1 and 2, it's time to join them together. Take two Unit 1s and one Unit 2. Line up the squares so that the seams press up against each other; this makes the block stronger and helps the seam allowances lay flat, which minimizes bulk.

Because you've pressed the seam allowance toward the darker squares, one seam allowance will go one way, and the other will go in the opposite direction. Place a pin, so it goes through both seam allowances, and continue pinning until you reach the edge. Repeat the process on both seam allowances on that row. Join row three, following the same steps.

Then, take your block to the machine. Back tack and stitch across the block using your 1/4-inch seam allowance. Back tack at the end, and cut your threads. Stitch the seam between rows two and three following the same method.

Quilting seams

Quilting seams

Finish the Block

Now, you're almost done. The last step is to press the new seam allowance flat and open the four intersections where the blocks meet. To do that, gently tug the four-way seam open and press so that the seams lay flat. This time the seam allowances will go toward the lighter squares. If you're working with a dark fabric that's likely to show through, press the seams open.

Yay! You're done. You've finished your first quilt block! Final step: Run around the house, showing anyone who'll listen! Obscure the computer screen with a nine-patch block if necessary to get their full attention! Ta-da!

Good Luck!

How's your nine-patch block coming along? Is it working out for you? Do you have any questions? Share your comments, questions and projects here.

© 2014 QuiltFinger