Block Basics: 3-Color Quarter Square Triangles

Welcome back!

We are moving on to some fun things, and I’m excited to show you how to make 3-color quarter-triangles.

These are sometimes used to make double pinwheels and when you get done, you’ll end up with 4: 2 that mirror the other 2.

3-Color Quarter-Square Triangles

Cut List:

  • 2- 4 1/2″ Background fabric
  • 1- 4 1/2″ Pattern fabric
  • 1- 4 1/2” Pattern fabric

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

Stack the two pattern pieces, with right sides together.

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

Cut on line and press toward darker fabric. They will look like a Half-Square-Triangle (HST).

Now draw a line on the back of BOTH background squares, diagonally, corner to corner.

Next, place the 2 print HST face up on the table with a background square on top.

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 four QST from with the four starting squares.

(See how they’re mirrored?)

Measure and Trim

Trim these to 3 1/2″ Square. The center of the block should be at 1 3/4”. Line up your square so that the diagonal line runs down the diagonal seam and the center point falls at 1 3/4” both horizontally and vertically.

Look how pretty they are!

These are cool! Look at the different ways you can put multiple of these together:

(The ones above are mirrored, the ones below are put together from 2 sets and using only one side.)

Double pinwheel


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 8 of these QST. When you start with the directions above, and start with four squares, you will end up with four QST. Just cut two of each color square and four of the background squares. Then you’ll end up with 8 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!