Block Basics: 2-Color Quarter-Square Triangles

Welcome back!

We are moving on to some fun things, and I’m excited to show you how to make 2-color quarter-triangles.

These are also called the “Hour Glass Block”. It’s the same thing, depending how you want to phrase it.

2-Color Quarter-Square Triangles

Cut List:

  • 1- 5 1/2″ Background fabric
  • 1- 5 1/2″ Pattern fabric

Take the lighter color fabric and draw a line diagonally from corner to corner.

Stack the two pieces, with right sides together.

Stitch 1/4″ away from each side of the diagonal line.

Cut on line.

Press toward darker fabric.

On the back of one of these Half-Square Triangles, draw a line perpendicular to the seam line. Do this by lining up the seam line, with a straight line on your ruler/straight edge. Line the edge of your ruler up with one of the points of your 2-color fabric.

Next, place on of the fabrics, right side up on your table. Place the next one, right side down, on top of the other one.

If the first one you place down has background towards the top and your pattern towards the bottom, then the one you place on top of it should be pattern side towards the top and the background towards the bottom so they are opposites.

Line up the center of both pieces, so the centers line up and nest nicely. When you fold back the corner of the top piece, there should be 4 pieces coming to a point in the middle. Pin together.

Sew 1/4″ from each side of the line that drew on the back of the one piece.

Cut down the line, and press open.

You will end up with two QST from two starting squares.

Measure and Trim

Trim these to 4 1/2″ Square. The center of the block should be at 2 1/4″. (Next week I will go into more detail on how to trim QST, so come back and make sure you check that out.)


If you have any questions, please go watch the YouTube video. I go into much more detail in the video, and you can watch it and follow along.

If you have questions after that, drop them in my comment section below, or on the comment section of the video and I will come and answer them.

How to Make Any Size Block

What if you want a different size of your block? It’s time to do some math.

The way I have the set up, I took the unfinished size and added 1″ to it. Another website I saw, said only add 3/4″. I think it depends on how much extra you want to be able to trim and make your perfect size. I would rather have too much, and be able to trim down, then not enough. So, I think I’m going to stick with the 1″.

So for example: if you want your unfinished size to 5 1/2″, add 1″ to that, and you will have 6 1/2″. Cut both pieces of fabric to 6 1/2″.

Beginner Skill Builder Sampler Quilt

If you are sewing along with me and making Beginner Skill Builder Sampler Quilt you will need to make 4 of these QST. When you start with the directions above, and start with two squares, you will end up with two QST. Just cut two of each color square, and make sure as you pair them up you’re putting a background square with a pattern square.

Then you’ll end up with 4 QST.

Tag me!

I would love to see your progress. Just tag me at #theashleytomlinson or #ashley_sunnymade and I’ll be able to see you on social media. 

I want to see how they turn out!

Happy sewing!