Grandmother's Cross Quilt Block

From our Free Quilt Block Patterns Library

This post contains affiliate links for which I receive compensation.

The Grandmother's Cross quilt block belongs to a family of blocks whose inner units are on-point. (One of the simplest blocks from this family is the Square in a Square. Another similarly constructed block is Mosaic #3.)

In this tutorial, you'll find both a some-cost and a no-cost alternative to make it using either a specialty ruler or templates.

Choose the method that most appeals to you.

The Grandmother's Cross quilt block tutorial begins here...

Grandma's not cross, but she'd sure like you to get started with her block!

General Instructions

All seam allowances are 1/4" and pressed towards the darker fabric unless otherwise indicated.

Because we'll be sewing a number of bias edges, starching your quilt fabric before you cut helps to minimize stretching during the stitching, pinning and pressing of the block.

The newest quilt fabrics to tickle your fancy...

Click the images below to see the full collection. We share any commercial and/or free patterns that showcase them, too. (For inspiration, of course!)

Step 1: Cut the patches for a Grandmother's Cross

As promised, two cutting options are presented for the Grandmother's Cross quilt block. The first uses the On-Point Ruler. The second uses templates.

On-Point Ruler (OPRuler)

Grandmother's Cross quilt block designGrandmother's Cross

Sample Size: 8" finished / 8½" unfinished

Grid: 8x8

Attribution: KC Star

Design Type: On-Point

If you'll be using the On-Point ruler, use this first cutting chart. Use the OPRuler for Patches #3 and #4. Use your everyday quilting ruler for #1 and #2.

To make the chart easier to read (and so that I could include 4 different sizes) I've abbreviated 'Background' to 'Bac'.

When there's a single number, i.e. 1 7/8" for Patch #1 in a 4" finished block, that means to cut a 1 7/8" by 1 7/8" square.

Generations Quilt Patterns logo

Cutting Chart for a
Grandmother's Cross Quilt Block

~Traditional Piecing~

PatchFabricQtyFinished Block SizeSub
1 Bac 2 1⅞" 2⅜" 2⅞" 3⅜" Symbol for a half square triangle
2 Bac 1 3¼" 4¼" 5¼" 6¼" Symbol for a quarter square triangle
3** Light 1 1” x 19” 1½" x 24” 2” x 30” 3” x 36” na
4** Dark 1 1” x 19” 1½" x 24” 2” x 30” 3” x 36” na
Unfinished Block Size 4½" 6½" 8½" 10½" ---
Grid Size 1" 1½" 2" 2½" ---

**REMEMBER, these measurements for the #3/#4 patches are for an OPRuler. They are not the same as with your everyday quilting rulers. If you don't have this ruler, use the templates furnished below.

Template Cutting

Download the template page that corresponds to the finished size you need from the table. Use Adobe to download them.

I've included grainlines in the patches and they seem to only seem to show up or show up correctly when they're printed with Adobe.

If you don't have this program, you can freely download it here.

In the 'Page Size and Handling' section of Adobe's print menu, you MUST set 'Custom Scale' to 100% so that the they print at the correct size.

for Grandmother's Cross
Finished Block Size

 There's a small square on each page that measures 1" when it's correct.

Click here to see where this is on the Print Menu page.

For more detailed instructions about downloading and printing go to How to Use Quilting Templates.

Step 2: Make the four patches

Four patch unit for Grandmothers' CrossFour patch unit

The patches for these units were cut with either the OPRuler or a template. Follow the instructions for the appropriate method.

On-Point Ruler

Cut the #3 and #4 strips using the OPRuler.

Below you can see the difference in the rulers when they're placed side by side on the same cut strips.

Measuring the same strip with an On-Point ruler vs a standard quilting rulerMeasuring the same strip with the two different quilting rulers.

The On-Point is the perfect tool for cutting squares, rectangles or half square triangles that are 'on-point' in a block. The orange and yellow squares in our Grandmother's Cross are just such units.

If you look closely at our cut strip when it's measured with a regular rotary ruler, the strip width is just shy of 2" wide.

Now that might not look like much, but if I'm going to go to the bother of perfecting my quarter inch seam allowance, it seems silly to me to then be willing to 'fudge' the measurement of these strips.

That's why I don't rotary cut these units with my standard rulers.

With right sides together (RST), stitch #3 and #4 strips together along the long edge with a 1/4" seam allowance.

Press unopened to set the seam and then open with the SA towards the darker fabric.

Again using the OPRuler, subcut the strip-set into units using the chart below.

Block Size
Width of StripSet after stitching Subcut
4" 2” 1”
6" 3” 1 1/2”
8" 4” 2”
10" 5” 2 1/2”

Align the subcut measurement (in this case 2" for this 8" finished sample block) with the straightened edge of the strip set (white arrow). Cut along the clear opposite edge (black arrow).

Subcutting the stripsetDon't forget—we're still using the OPRuler for our subcutting. Here I'm subcutting 2" units for my 8" finished Grandmother's Cross.

Cut 10.


If you've used a template to cut your patches, sew 10 pairs of #3 and #4 patches, pressing to the darker fabric.

For either method of cutting, now arrange them into pairs alternating lights and darks.

From this point forward, the instructions are the same for either cutting method.

With RST, stitch the pairs together.

In the center, pick out a few stitches to release the SA and twirl the seams as shown below. Press.

Twirl the seam allowances to minimize bulk.Twirled seam allowances reduce bulk

Step 3: Stitch the Grandmother's Cross units into rows

Arrange the #1 and #2 triangles and the sewn four patches as shown below. The darker fabric is at the top and bottom of the four patches. The SA 'twirl around in a counterclockwise direction.

Arrange the patches into the block's designThe twirled SAs nest to make matching seams easier

Starting with the upper right four-patch, with RST align a shorter edge of a #2 triangle with the edge of the four-patch. Since the tail on the triangle is so long, I prefer to pin to hold things in place.

Stitch, starting from the even side.

Stitch a #2 triangle to the side of a four-patch unitIf that triangle point wants to move, use a stilleto to hold it in place. If you don't have a stiletto, use the point of your seam ripper.

Stitch the second #2 to the opposite side of the four-patch.

Press with SA toward the #2s.

If you stitched with an accurate 1/4" SA, the triangle will extend a smidge past the bottom of the 4-patch. (white arrows below)

The ends of the #2 triangles extend past the edge of the four patchYou can just make out the fingerpressed crease in the #1 HST.

To find the center of the #1 triangle, fold it in half and fingerpress a crease. You can just make it out above.

With RST, match this crease with the seam in the 4-patch. Pin.

This time, your 1/4" seam should begin and end in the valley created by the patches. (white arrow below).

Use a stiletto (the point of your seam ripper or a bamboo skewer will do in a pinch) to hold the long points of the #1 in place during sewing.

Stitch the #1 to the #2/#3/#4 unitThe seam begins in the valley created by the two units

Press with the SA toward #1.  Create another unit like this starting with the lower right 4-patch.

To make the center row, with RST stitch the three 4-patches together paying careful attention to the direction of the SAs. Stitch a #1 to each short end, folding and fingerpressing the #1's in half to find their centers.

With RST, add the #1s to each end of this center unit in the same way as the corners.

Step 4: Assembling the Grandmother's Cross quilt block

Arrange the units into diagonal rows. Trim the dog ears away either now or later, it doesn't make any difference unless they are in your way now.

Lay out the rows of the Grandmother's Cross

With RST, match and pin a corner to one side of the center. Again, your 1/4" SA starts and ends in the valley created by the two units.

Stitching the rows togetherYes, I use pins--especially because of the triangle points that stick out at the beginning and end of the seam. I'll use my seam ripper as a stiletto to guide those points thru the machine.

Add the second corner unit to the opposite side.

Press with the SA away from the center.

This is the finished Grandmother's Cross quilt block.

A finished Grandmother's Cross quilt blockOur Grandmother's Cross is ready to be pieced into a quilt!

For more quilt block patterns to try...

Link to Free Quilt Block Patterns Library the image to go to our Quilt Block Patterns Library.

You'll find over 130 blocks to make in multiple sizes.

As always, if there's a template or paper piecing pattern needed to complete the block, just like here in the Grandmother's Cross, you'll find it as a no-cost download.


What about a different quilt block?

For a list of all the 220+ quilt block patterns on this site, start here.

If you know the name of the block, shorten your search by using these links:




Click here if you're looking for blocks with at least some paper piecing.

Click here if you're looking for the basic building blocks of quilting, i.e., Flying Geese, half square triangles, quarter square triangles, etc., along with several techniques to make each.

And finally, use these links to find blocks in these finished sizes:

For even more blocks to make...

Click here to learn about my favorite quilt book resources that inspire my patchwork designs.

For you, are quilt block designs like potato chips... can't have just one?!!

Check the amazing resources I rely on for all the quilt block designs you see on this website. 

To see if they're worthy of a spot in YOUR quilting library, CLICK HERE.

This article was printed from

Print Article

Follow Us