Paper Piecing – My favourite method for making half-square triangles for quilting

blue and white fabric pieced triangles with title "half square triangles".

The thought of paper piecing causes some quilters to break out into a cold sweat.  Trust me, though.  Paper piecing half square triangles is not at all like making complex stars or picture blocks.  It is simple and straightforward.

Choose your paper

To begin, you need to cut two pieces of fabric – the two triangle colours.  The sizes will differ depending on what triangle papers you are using.

There are many different options available to paper piece triangles. If you google “half square triangle paper”, you will find a bunch of different options. Some are files that you can print yourself and others are physical printed papers that you can order.

triangle paper for piecing half square triangles.

If you have the time, you can even draw your own grid on paper (or directly onto the fabric).

All of these designs are based on squares or grids with diagonal stitch lines marked right on the paper.

I have tried many different variations, and they all work great. My personal favourite is Thangles brand. The reason I like it is that if you need a 4″ finished piece, you will use a 4-1/2″ strip.

Thangles brand paper for piecing triangles.

This means that if I am making a block with squares and half square triangles, I can get all the pieces from one strip of fabric. I don’t have to cut a bunch of different sizes.


Place the fabric right sides together and put the paper on top.  Pin together securely.  For this size, one full Thangles paper will make four HST units.

Sew along the dotted lines.  This has to be accurate, but the line is right there for you.  You don’t need a special foot or seam allowance marking.

paper with fabric pinned and stitched on dotted lines.


Cut along the solid lines using a rotary cutter and ruler.

Open and press

Open the triangles and finger press the seam allowance to the dark side.

After finger pressing, press with an iron, being careful only to move the iron up and down, not back and forth.

removing the paper from the triangle pieced units.

Remove the paper

Remove the paper. If you use a short stitch length, it should perforate easily. This is a good activity to do while watching tv.

collection of white and blue half square triangle pieces.

What’s Good

  • accurate stitching is easy
  • no trimming or squaring up
  • quick

What’s Not Good

  • paper is one time use
  • have to remove papers

When to use this method

  • need a lot of HSTs
  • making one block that uses HSTs and squares
  • using jelly rolls

Rating: 5 out of 5

This is my favourite method of making HSTs.  Removing the paper can be annoying, but not nearly as much as squaring up.


blue fabric pieced triangles with title "half square triangles".
blue fabric pieced triangles with title "half square triangles".

Elizabeth DeCroos - Epida Studio.

Elizabeth DeCroos

Elizabeth DeCroos is the designer and teacher at Epida Studio. She loves to work in quilting, pojagi and embroidery and teach these techniques to others.
Learn more and get her to speak to your group.

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