Four Corners Quilt Block Tutorial:
6", 9", and 12" finished

Ready to make a quilt block classic?

If you’re a confident beginner, the Four Corners quilt block is a wonderful place to start.

Follow our easy-peasy tutorial and use traditional piecing techniques for this classic block. No specialty rulers needed - it's so simple that picking between 6", 9" or 12" finished sizes is about as tough as it gets.

Install your favorite 1/4" presser foot.

With RST, pair a QST.3 square with a QST.1.

Stitch a 1/4" from both sides of the line.

Repeat the process for the second QST.3 paired with a QST.2.

Press.

Cut each pair in half along the drawn line.

Press again with the SAs toward the darker fabrics.

Time to mark our patches again. 

Select the two that are easiest to see a mark on and draw a diagonal line from corner to corner across the SA.

Line up a straight line on your ruler with the seam line (red arrow) to ensure you'll have 90° angles in the center of your QSTs.

Mark the backsides of two of the four HSTs.

If you look closely at the right HST above, you can see that the diagonal line doesn't go straight through the corner at the top. That's OK. These patches are cut oversized. We've got some wiggle room on purpose. 

It's more important to have that marked line be perfectly perpendicular through the seam.

With RST, nest the SAs of a QST.1/QST.3 HST and a QST.2/QST.3 HST.

I like to pin to hold the match in the center. Those pins are far enough from the marked line that it isn't necessary to remove them while sewing.

Stitch 1/4" away from both sides of the marking for both pairs of patches.

Before cutting these in half between the stitching lines, check the match at the center.

If you don't like the match, this is your only chance to fix it.

When you're happy, cut each sewn pair in half along the drawn line.

Loosen the stitches (DO NOT trim them away) in the center of the unit to twirl or fan the SAs around the center. This reduces the lumpiness in the center—one less bump to worry about when you're machine quilting.

Press them the QST flat. I find it helpful to fingerpress these seams around the center and then go back in with my iron.

Our four QSTs are ready to be trimmed. I've laid them out to show you that if the direction of the print matters to you, that you'll automatically have the print going in all the right directions.

You just have to look for it and then pay attention as you piece the patches together.

In the chart below, find your finished block size and it's corresponding Center measurement. For our 12" sample Four Corners, the Center is at 2-1/4".

QST Dimensions
Finished Block Size	Center Measurement	Trim QST to…
6"	1½"	2½" x 2½"
9"	1¾"	3½" x 3½"
12"	2¼"	4½" x 4½"

At your cutting mat, block right side up, align the Center measurement with the center of your QST—directly over where the seams meet. (red arrow)

At the same time, the 45° line on your ruler is over one of the diagonal seams. For a right-hander like myself, it's over the diagonal that runs upper right to lower left.

One more thing to check. The 'Trim QST to...' measurement on your ruler is right at the two remaining seams of your QST. (blue arrows)

Once all of this is lined up, trim away the excess fabric at the two exposed edges.

Turn your block 180°. Now line up the 'Trim QST to...' measurements (4½" for our 12" finished sample) with the two edges you just cut. 

The dashed 45° line is directly over a diagonal seam (upper right corner to lower left below).

Again, trim away the excess on the exposed edges.

And Voila!

You now have four perfectly sized QSTs. A diagonal seam cuts each corner in half. A nice match in the center of the seams and QSTs that lay flat.

What's not to love?

Sew a #3 to #1/#2.

Press SAs toward #3 to minimize bulk.

If you are using a non-directional fabric, make all 4 units the same as shown to this point. When they are added to the block, turn each a 1/4 turn so that the #1 is towards the center of the block.

If you are using a directional fabric like this dinosaur print, and want all the dinosaurs with their heads up, you'll need to play around with the patches to make sure they're all in the proper direction. 

My suggestion is to make one at a time to avoid having to rip anything out.

Seriously.

I'd rather lick the back of the refrigerator than rip out stitches.

Here are my four #1/#2/#3 with dinosaur heads all up in the sky.

Step 3: Assemble the Four Corners quilt block

Arrange the corners, the QSTs and center square so that the dark fabrics are around the outside edges, and the lightest fabric forms the star points.

You can see in the photo below that the directional print in the QSTs is all in the proper direction—look for the blue dinosaurs—without any extra effort. Simply pay attention as you arrange the patches.

Sew the units into rows with the SAs pressed away from the QSTs in all rows.

Stitch the rows together to complete your Four Corners quilt block. 

I've pressed the SAs away from the center row.

Our Four Corners block from the back side looks like this.

If you were setting these blocks together, edge-to-edge, i.e., no sashing between them, you would press these last two seams in towards the center. That way, the seams would nest.

So much easier to line them up that way.