Quarter square triangles are a basic block you can use alone or combine with other blocks to form more intricate quilt designs. When using only two fabrics, the quilt block is also called the Hourglass Quilt Block. The basic block is four (4) 90-degree triangles sewn together.
Our preferred method to making this block creates two (2) at a time, with the outside edges on straight of grain. To start, we make half square triangles, and then layer them to sew into quarter square triangles. Other names for this technique are the sandwich method, or quick piecing method. This is an easier method than sewing together individually cut 90-degree triangles, and more accurate.
We start with the basic half square triangle. Here is an article that shows you seven (7) ways to make half square triangles.
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Quarter Square Triangle Calculator
First, decide the size of your finished quarter square triangle block. In the tutorial below, we wanted a 3″ finished quilt block. Add 1-1/4″ to the finished size, which gives you the size to cut the pieces. This allows the seam allowances in a finished 3″ quilt block. Here is a handy reference for you:
Browse through more quilting tutorials on Create Whimsy.
The quarter square triangle is used in many quilt blocks, including Ohio Star and Variable Star quilt blocks.